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Chapter Questions - Respiratory System

front 1

Air moving from the nose to the trachea passed by a number of structures. List as many of these as you can.

back 1

The respiratory system includes the nose, nasal cavity, and paranasal sinuses; the pharynx; the larynx

front 2

Which structure seals the larynx when we swallow?

back 2

During swallowing, the soft palate and its pendulous uvula (u vu-lah; “little grape”) move superiorly an action that closes off the nasopharynx and prevents food from entering the nasal cavity.
The epiglottis seals the larynx when we swallow

front 3

Which structural features of the trachea allow it to expand and contract, yet keep it from collapsing?

back 3

The incomplete, c-shaped cartilage rings of the trachea allow it to expand and contract and yet keep it from collapsing

front 4

What features of the alveoli and their respiratory membranes suit them to their function of exchanging gases by diffusion?

back 4

The many tiny alveoli together have a large surface area. This and the thinness of their respiratory membranes make them ideal for gas exchange

front 5

A 3 year old boy is brought to the ER after aspiring a peanut. Bronchoscopy confirms the suspicion that the peanut is lodged in a bronchus and then it is successfully extracted. Which main bronchus was the peanut most likely in? Why?

back 5

The peanut was most likely in the right main bronchus because it is wider and more vertical than the left.

front 6

The lungs are perfused by 2 different circulations. Name these circulations and indicate their roles in the lungs.

back 6

The two circulations of the lungs are the pulmonary circulation, which delivers deoxygenated blood to the lungs for oxygenation and returns oxygenated blood to the heart, and the bronchial circulation, which provides systemic (oxygenated) blood to the tissues

front 7

What is the driving force for pulmonary ventilation?

back 7

The driving force for pulmonary ventilation is a pressure gradient created by changes in the thoracic volume

front 8

What causes the intrapulmonary pressure to decrease during inspiration?

back 8

The intrapulmonary pressure decreases during aspiration because of the increase in thoracic cavity volume brought about by the muscles of inspiration

front 9

What causes the partial vacuum inside the pleural cavity? What happens to a lung if air enters the pleural cavity? What is the clinical name for this condition?

back 9

The partial vacuum inside the pleural cavity is caused by the opposing forces acting on the visceral and parietal pleurae. the visceral pleura are pulled inward by the lungs' natural tendency to recoil and the surface tension of the alveolar fluid. the parietal pleurae are pulled outward by the elasticity of the chest wall. If air enters the pleural cavity, the lung on that side will collapse. This condition is called pneumothorax

front 10

Resistance in the airways is typically low. Why?

back 10

Airway resistance is low because the diameters of most airways are relatively large, for smaller airways there are many in parallel, making their combined diameter large, and air has a low viscosity

front 11

Premature infants often lack adequate surfactant. How does this affect their ability to breathe?

back 11

A lack of surfactant increases surface tension in the alveoli and causes them to collapse between breaths

front 12

Explain why slow, deep breaths ventilate the alveoli more effectively than do rapid, shallow breaths

back 12

Slow, deep breaths ventilate the alveoli more effectively because a smaller fraction of the tidal volume of each breath is spent moving air into and out of the dead space

front 13

You are given a sealed container of water and air. The Pco2 and Po2 in the air are both 100mm Hg. What are the Pco2 and Po2 in the water? Which gas has more molecules dissolved in the water? Why?

back 13

In a sealed contain the air and water would be equilibrium. Therefore the partial pressure of CO2 and O2 (Pco2 and Po2) would be the same in the water as well as in the air: 100mm Hg each. More Co2 then O2 molecules will be dissolved in the water (even though they are at the same partial pressure) because CO2 is more soluable than O2 in water.

front 14

Po2 in the alveoli is about 56 mmHg lower than in inspired air. explain this difference

back 14

The difference in po2 between inspired air and alveolar air can be explained by the gas exchange occurring in the lungs, the humidification of inspired air, and the mixing of newly inspired air with gases already present in the alveoli

front 15

Suppose a patient is receiving oxygen by mask. Are the arterioles leading into the O2-enriched alveoli dilated or constricted? What is the advantage of this response?

back 15

The arterioles leading into the O2 enriched alveoli would be dialted. This responses allows amtching blood flow to availability of oxygen

front 16

Rapidly metabolizing tissues generate large amounts of CO2 and H+. How does this affect O2 unloading? What is the effect called?

back 16

Both co2 and h+ increase o2 unleading by binding to Hb. this is called the bohr's effect

front 17

List the three ways CO2 is transported in blood and state approximate percentages of each.

back 17

1. Dissolved in plasma (7–10%).
2. Chemically bound to hemoglobin (just over 20%).
3. As bicarbonate ion in plasma (about 70%).

front 18

What is the relationship between CO2 and pH in the blood? Explain.

back 18

As blood CO2 increases, blood ph decreases. This is because co2 combines with water to form bicarbic acid

front 19

Which brain stem respiratory area is thought to generate the respiratory rhythm?

back 19

The ventral respiratory group of the medulla (VRG) is thought to be the rhythm generating area.

front 20

Which chemical factor in blood normally provides the most powerful stimulus to breathe?

back 20

CO2 in blood normally provides the most powerful stimulus to breathe.

Central chemoreceptors are most important in this response

front 21

An injured soccer player arrives by ambulance in the emergency room. She is in obvious distress, breathing rapidly. Her blood Pco2 is 26 mg Hg and pH is 7.5. Is she suffering from hyperventilation or hyperpnea? Explain

back 21

The injured soccer players Pco2 is low. The low Pco2 reveals that this is hyperventilation and not hyperpnea.

front 22

What long-term adjustment does the body make when living at high altitudes?

back 22

Long term adjustments to altitude include an increase in erythropoiesis, resulting in a higher hemacrit; an increase in PBG which decreases Hb affinity for oxygen; and an increase in minute respiratory volume

front 23

What distinguishes the obstruction in asthma from that in chronic bronchitis?

back 23

The obstruction in asthma is reversible. An acute exacerbations are typically followed by symptom-free periods. In contrast, the obstruction in chronic bronchitis is generally not reversible

front 24

What is the underlying defect in cystic fibrosis?

back 24

The underlying defect in cystic fibrosis is an abnormality in a protein (CFTR protein) that acts as a membrane channel for chloride ions

front 25

List two reasons for the decline in vital capacity seen with age.

back 25

Vital Capacity declines with age because the thoracic wall becomes more rigid and the lungs lose their elasticity