Which are the lymphatic organs of the oral cavity and pharynx?

Tonsils

Match each statement with the appropriate lymphatic structure.

(find the functions of lymph node, thymus, spleen)

Lymph node: Filters lymph; initiates immune responses

Thymus: Site of maturation of T lymphocytes

Spleen: Filters blood; initiates immune responses

Cytotoxic T cells mount an immune response against __________.

cells that display foreign proteins on their surface

Cytotoxic T cells produce __________ which creates holes in the cell membranes of target cells.

perforin

How do cytotoxic T cells recognize that a cell is infected with a virus and needs to be destroyed?

The presence of foreign (viral) proteins on the target cell surface.

The receptors on cytotoxic T cells bind to __________.

viral antigens and class I MHC.

Foreign substances that elicit an immune response are called __________.

antigens

Macrophages secrete __________ which then activates __________ .

interleukin-1 ; helper T cells

Cytotoxic T cells target and destroy __________.

infected "self" cells

Helper T cells stimulate the proliferation of __________.

cytotoxic T cells and B cells

The secondary immune response to a previously encountered pathogen is swifter and stronger than the primary immune response.

True

Complete the sentences describing the functions of the lymphatic system.

The lymphatic system is involved in the absorption of __________ from the digestive system.

fats

Label the features of the capillary and lymphatic bed.

This flow chart diagrams the series of structures involved in lymphatic drainage. Indicate the correct order of vessels.

Lymphatic capillary -> afferent lymphatic vessel -> lymph node -> efferent lymphatic vessel -> lymphatic trunk -> collecting duct -> subclavian vein

Complete the sentences describing tissue fluid and the formation of lymph.

Lymph drainage is important for what functions?

absorption of dietary fats,

return of small proteins from tissue fluid to blood,

transport of foreign particles from tissue fluid to lymph nodes

The absence or blockage of lymph vessels in a body region leads directly to what condition?

adema

This image shows a lymphatic vessel. The arrows indicate valves found in these vessels. Based on your understanding of the function of lymphatic valves, in which direction would lymph be flowing through the vessel shown?

From bottom of image toward top of image

Exercise is associated with an increase in lymph movement.

True

This figure shows the areas of lymphatic drainage. Correctly indicate the collecting duct that drains each area.

Lymph eventually is returned to the circulation at what blood vessels?

Right and left subclavian veins.

What is the role of skeletal muscle contractions in the flow of lymph?

skeletal muscles contraction compress lymphatic vessels, encourages the lymph to flow toward the upper thorax

Label the components of the sectioned lymph node.

Indicate where in the lymph nodes the listed cell types are found by dragging labels to the appropriate boxes. Some labels are used more than once.

List the function(s) of lymph nodes.

Filter lymph,

Immune surveillance,

In the cadaver image shown, name the group of lymph nodes highlighted in yellow.

Axillary lymph nodes

Label the clusters of lymph nodes.

For each description, indicate the correct group of lymph nodes.

In the cadaver image, identify the lymphatic structure highlighted in yellow.

Thymus

In this image of the abdominal cavity of a cadaver, name the structure highlighted in yellow.

Spleen

Label the thymus, spleen, and neighboring structures and organs.

Label the tissues and vessels of the spleen.

Label the regions within the spleen.

Classify each item as a feature of innate defense or adaptive defense.

The ______ defense mechanisms target specific pathogens.

In contrast, the more general defenses that protect against many types of pathogens are the _____ defense mechanisms.

adaptive

innate

Consider the types of defense. Drop each label into the flow chart to indicate whether it is a first, second, or third line of defense.

A chemical called endogenous pyrogen may be released from lymphocytes that are responding to a pathogen. What does this compound cause?

fever

Natural killer (NK) cells are what type of cell?

lymphocyte

Name the cells included in the mononuclear phagocytic system

Macrophages,

monocytes,

neutrophils

Match the description with the correct chemical barrier.

Name the innate defense that involves vasodilation and increased vascular permeability, resulting in the influx of blood, blood cells, and fluid to an area of injury or infection.

Multiple Choice

Inflammation

The figure illustrates the sites of lymphocyte precursor production, the site where T cells are processed, the site where B cells are processed, and an eventual location for the lymphocytes. Label each site.

Place the labels describing the locations of origin, development, and action of lymphocytes in the correct location on the figure.

Indicate the characteristics of the label is associated with B cells or T cells

Complete the sentences describing the types of T cells

Drag each label to the appropriate box to indicate if the label is associated with B cells or T cells

Indicate the cells that can function as antigen-presenting cells.

Dendritic cells, macrophages, and B cells

This figure illustrates the activation of B and T cells. Label the cells that are involved in the process.

This figure illustrates the process of stimulation and proliferation of B cells.

What term refers to any molecule that elicits an immune response?

Antigen

Cells such as macrophages can process foreign antigens and attach them to their cell surface in order to assist in activation of T cells. What are cells that have this function called?

Antigen-presenting cells

Place the events leading to T cell activation in the correct order.

Match the description with the correct type of cytokine.

Cell membrane proteins called ______ major histocompatibility complex (MHC) antigens are found on antigen-presenting cells, thymus cells, and activated T cells.

The _______ MHC antigens are found on membranes of all body cells, except red blood cells.

Class II

Class I

Class I MHC antigens are found in the membranes of_____ .

Class II MHC antigens are found in the membranes of ___________.

all body cells except RBCs

antigen-presenting cells, thymus cells, and activated T cells

The body is equipped with several mechanisms that function to prevent infection by pathogens. These mechanisms are referred to as the innate (nonspecific) defenses. They include mechanical and chemical barriers, phagocytic and natural killer cells, and the processes of inflammation and fever.

1. Interferons and complement proteins are examples of __________.

2. The changes that occur in infected or injured tissue (redness, swelling, heat, pain) are due to the process of __________.

3. Mechanical barriers include __________.

1. Chemical barriers
2. Inflammation
3. Skin and mucous membranes

The adaptive defenses are those responses by immune cells that target specific foreign antigens, with the purpose of destroying or inactivating the antigen. Review the roles of the various types of immune cells and answer the questions below. In the next activity, you will view an animation showing the steps in an immune response.

1. The primary cells of the immune response are the T and B cells. T and B cells are what type of cell?

2. Macrophages have a role in both innate and adaptive defenses. What is the function of macrophages during infection by a pathogen?
3. Phagocytic cells such as macrophages digest a pathogen, then insert a bit of pathogenic antigen on their cell membrane. In this role, these cells are described as being __________ cells.

1. Lymphocytes
2. To phagocytize the pathogen
3. Antigen-presenting

1. A macrophage that has phagocytized and displayed the antigen on its surface is acting as a(n) __________.
2. Macrophages that are displaying a pathogenic antigen will interact with __________ which then continue the immune response.
3. Name the immune cell that interacts with and kills an infected "self" cell.
4. B cells are activated by (1) the binding of their antigen and (2) interaction with __________.
5. What type of cell produces antibodies?
6. Memory cells are involved in the __________ immune response.

1. Antigen-presenting cell
2. Helper T cells
3. Cytotoxic cells
4. Helper T cells
5. Plasma cells
6. Secondary

Indicate whether the listed components of an immune response interact directly with an antigen, or if presentation of the antigen by an antigen-presenting cell is required. Labels may be used twice.

Complete the sentences describing the various classes of immunoglobulins, or antibodies.

Complete the sentences describing antibodies.

Fill in the blanks in the figure legend, indicating the identity of the different colored segments of the antibody molecule.
Each label is used twice.

Drop each label into the appropriate box, indicating which class of immunoglobulin is being described. Some labels are used more than once.

What class of immunoglobulin is involved in immediate-reaction allergic reactions?

IgE

Memory T and B cells function in what type of response?

Secondary immune responseCorrect

The labels describe either a primary or secondary immune response. Drop each label into the appropriate bo

Immunity acquired with the injection of antibodies from another source is called ____

Immunity resulting when one's own immune system responds to an antigen encountered through normal routes is called______

Immunity in a newborn due to the passing of maternal antibodies through the placenta is called______

Immunity that occurs following vaccination with an antigen is called ______

artificially acquired passive immunity

naturally acquired active

naturally acquired passive

artificially acquired active

Complete the sentences describing the different types of immunity.

With aging, there is no decrease in the number B cells, and only a slight decrease in the number of T cells.

True

What is the first component(s) of the immune system to decline with age?

Thymus

Put the steps that occur during an immediate-reaction allergic response in the correct order.

Place the steps that occur during an immediate-reaction allergic response in the correct order.

Indicate characteristic into the appropriate box, describing each type of hypersensitivity.

What is another term for allergy?

Hypersensitivity

For each classification of transplant, indicate the correct type of donor.

Tissue rejection following a transplant resembles a __________ immune response.

Cellular

What term is used for disorders resulting from the immune system attacking "self" cells?

Autoimmune diseases

1. Indicate the order of cell types involved in the response to the first exposure to an allergen.
2. Antibodies attach to mast cells via what part of the antibody structure?
3. With second exposure to an antigen, the antigen molecules bind to __________.

1. Antigen-presenting cell, helper T cell, B cell, plasma cell
2. Constant region
3. IgE on the mast cells

1. In antibody-dependent cytotoxic allergic reactions (type II), the binding of __________ to targeted cells results in lysis of those cells.
2. Which of the following transfusions would result in an antibody-dependent cytotoxic (type II) allergic reaction?

1. Antibodies
2. Type A blood given to a type B recipient

1. Immune complexes that are not removed by macrophages can react with and activate __________.
2. The degranulation of cells called __________ occurs in response to the activation of complement by immune complexes. The result is __________ of blood vessels. This leads to some of the symptoms of a type III hypersensitivity reaction.
3. 3. The presence of the immune complexes and complement attracts and activates neutrophils, causing them to degranulate. What is the effect of neutrophil activation? (This effect will also lead to some of the symptoms of a type III response.)

1. Complement
2. Basophils; vasodilation
3. Tissue damage

1. Delayed hypersensitivity is __________ mediated.
2. What type of cell is responsible for contact dermatitis and tissue rejection?
3. In a reaction to poison oak or poison ivy, a small molecule from the plant, called a(n) __________, will bind to a host molecule, triggering an allergic reaction.
4. What is presented on the macrophage surface?
5. First exposure to the allergen (hapten) causes an increase in the number of __________.
6. What attracts additional macrophages and causes their release of mediators of inflammation?

1. Cell
2. Th1 cells
3. Hapten
4. Hapten plus class II MHC
5. Th1 cells
6. Release of cytokines from Th1 cells

Label the figure showing the pathway for lymphatic drainage from the right breast.

What is the name of the fluid contained within vessels of the lymphatic system?

Lymph

What is the name of the structure found in lymphatic vessels, indicated by the arrows?

Valve

Complete the sentences describing the process of inflammation.

When T or B cells are activated, they proliferate, forming a group of genetically identical cells descending from the original activated cell. What is the name of this group of identical cells?

Clone

A molecule called a(n) _______ is typically a large, complex molecule that stimulates an immune response.

A small molecule that can not stimulate an immune response on its own, but may cause an immune response when it binds to a larger molecule is called a(n).

antigen

hapten

Complete the sentences describing the actions of antibodies.

What type of immunity will result from receiving a vaccination?

Artificially acquired active immunity

Delayed-reaction allergic responses are mediated by B cells.

False

As lymph is returned to the blood, it enters the __________ circulation.

venous

What is inflammation?

Tissue response to injury or infection

What type of T cell does not respond to a foreign antigen on first exposure, but will respond rapidly upon subsequent exposure?

Memory cells

Lymphatic pathways begin at the lymphatic capillaries which empty into lymphatic vessels. From there, fluid flows through lymphatic __________ into lymphatic __________, eventually emptying into veins in the thorax.

trunks; ducts

What are lymphatic nodules?

Compact masses of lymphatic tissue

In order to be fully activated, most __________ cells require interaction with __________ cells.

B

T

Autoimmune Polyendocrinopathy Syndrome type 1 (APS-1) is a rare autoimmune disorder. Autoimmune diseases occur when the immune system attacks the cells of the body as if they were pathogens. In APS-1, a protein called AIRE, expressed in the thymus, is mutated. AIRE protein is part of the apparatus that presents self-antigens to T-cells in the medulla of the thymus. In APS-1, AIRE protein is mutated to the extent that it cannot perform its function.

1. What portion of T-cell maturation is impaired in APS-1?
2. The T-cells of patients with AIRE could have which of the following problems?

1. Negative selection
2. The T-cells will express all the correct receptors, but may react with self-antigens.

1. Which of these cells produces IL-2?
2. What does a cytotoxic T-cell release upon recognizing a virally-infected cell (assuming the T-cell was previously activated with IL-2)?
3. Which of these molecules is likely to be presented from the endogenous pathway?

1. Helper T cells
2. Granzymes
3. Viral capsid protein

Place these items in the correct sequence.

Which of these processes involves a phagocytic cell?

opsonization

Ebola is a virus that is transmitted through exchange of blood and other bodily fluids. Once the virus enters the body it resides inside of cells. During the Ebola outbreak of 2014-2015 there were no available vaccines or medications. Several patients were saved, however, by receiving blood plasma containing antibodies from patients who had been previously infected and survived.

1. Which of the following may have occurred in the Ebola patients after the blood plasma and antibody transfusion?
2. Fc regions are similar from one patient to another. Would phagocytic cells be involved in clearing the Ebola virus from the patient recipient?

1. Ebola viruses will be neutralized as they become coated with antibodies.
2. Yes, opsonization of the neutralized viruses is likely to occur.

1. Which of these cells is capable of phagocytosis?
2. Which of these chemicals aids in inducing apoptosis in a virally-infected cell?
3. Which of these cell types is capable of producing cytotoxic chemicals against a multicellular parasite?

1. Dendritic cells
2. Granzyme
3. Eosinophils

1. Which of the following is largely responsible for swelling during inflammation?
2. Vasodilation and capillary permeability might be helpful in an immune reaction because...

1. Histamine
2. Vasodilation and increased permeability allow immune cells to exit the blood and fight bacteria in the tissues.

1. Which of the following is NOT an effect of interferons secreted by an infected cell?
2. Which of these cells or organs plays a role in destroying pathogens using complement?
3. Which of these statements is TRUE about macrophages?

1. Interferons attach to viruses, resulting in destruction of the pathogens.
2. The liver, macrophages, erythrocytes
3. Macrophages phagocytose bacteria when they recognize complement proteins on the bacterial surface.

1. Which of the following best describes the role of complement protein C5b in the immune response?
2. What clinical symptoms do you expect from patients with p.A252T homozygous mutations?

1. C5b helps form a complement protein complex on bacteria cells that leads to their destruction.
2. An increase in frequency of bacterial diseases such as meningitis and pneumonia