Adjacent cells in lymphatic capillaries overlap each other loosely. These cells form a unique structural modification that increases their permeability that is known as the __________.
minivalves
Which of the following returns lymph to the right lymphatic duct?
right side of the head
Which of the following delivers lymph into the junction of the internal jugular vein and the subclavian vein?
thoracic duct
Which of the following promotes closure of the minivalves associated with lymph capillaries?
increasing pressure inside the lymph capillary
To what organ do the lymphatic vessels return protein-rich escaped fluids to rejoin circulation?
heart
What do collecting lymphatic vessels NOT share in common with veins of the cardiovascular system?
thickness of the walls
What is the main function of the lymphatic system?
The lymphatic system returns leaked fluid and plasma proteins that escape from the bloodstream to the blood.
Which of the following lacks lymph capillaries?
bones and teeth
Lymph from the right leg ultimately is delivered to which duct in the thoracic region?
thoracic duct
Lymph from what regions of the body is drained into the right lymphatic duct?
right upper limb, right side of the head and thorax
What is the name of the enlarged sac to which the lumbar trunks and the intestinal trunk returns lymph?
cisterna chyli
Lymph is most similar to __________.
interstitial fluid
Lymphatic collecting vessels are most closely associated with __________.
capillary beds
Which of the following statements is true regarding veins versus lymphatic collecting vessels?
Veins have fewer internal valves than do lymphatic vessels.
Once collected, lymph is returned to __________.
venous circulation
Lymphatic vessels __________.
return tissue fluid to the bloodstream
Lymphangitis is caused by ______.
an infection
Lymphedema may be treated by all EXCEPT which of the following?
bed rest to allow enhanced blood flow and therefore healing of the affected area
What is the role of the mini-valves in lymph capillaries?
increase permeability
When the lymphatic structures of a limb are blocked due to tumors, the result is ________.
severe localized edema distal to the blockage of that limb
Select the correct statement about lymph transport.
Lymph transport depends on the movement of adjacent tissues, such as skeletal muscles.
Lymph capillaries are absent in all except which of the following?
digestive organs
Large clusters of lymph nodes occur in all of the following locations except the ________.
lower extremities
Which of the following is not a method that maintains lymph flow?
capillary smooth muscle contraction
Which of the following is not a normal component of lymph?
red blood cells
Which of the following is not a function of the lymphatic system?
transporting respiratory gases
Lymph transport involves all but which of the following?
smooth muscle contraction in the lymph capillary walls
Which lymphatic structure drains lymph from the right upper limb and the right side of the head and thorax?
right lymphatic duct
Which of the following is not a part of the lymphatic system?
erythrocytes
The lymphatic capillaries are ________.
more permeable than blood capillaries
Like blood, lymph flows both to and from the heart.
F
When tissues are inflamed, lymphatic capillaries develop openings that permit uptake of large particles such as cell debris, pathogens, and cancer cells.
T
The cisterna chyli collects lymph from the lumbar trunks draining the upper limbs and from the intestinal trunk draining the digestive organs.
F
The lymphatic capillaries function to absorb the excess protein-containing interstitial fluid and return it to the bloodstream.
T
Lymph capillary permeability is due to minivalves and protein filaments.
T
Lymphatic capillaries are permeable to proteins.
T
Digested fats are absorbed from the intestine by the lymph capillaries.
T
Chyle is delivered to the blood via the lymphatic system.
T
About 3 liters of fluid are lost to the tissue spaces every 24 hours and are returned to the bloodstream as lymph.
T
Because lymph vessels are very low-pressure conduits, movements of adjacent tissues are important in propelling lymph through the lymphatics.
T