Unit 5 - A & P Module - Regulation of ventilation

Question 1

The following statements is true.

Answer 1

Hemoglobin removes H+ from the cytoplasm by binding to it.

Question 2

At the alveoli, the rate of diffusion of O2 and CO2 is dependent on the __________.

Answer 2

surface area of alveolar membranes,
partial pressure gradients for O2 and CO2, thickness of the respiratory membrane

Question 3

What would be a result of a decrease in plasma PO2?

Answer 3

a decrease in percent saturation of hemoglobin with oxygen

Question 4

The movement of gases from air to liquid is directly proportional to all of the following factors except __________.

Answer 4

surface area

The movement of gases from air to liquid is directly proportional to solubility, pressure, temperature

Question 5

Most of the oxygen in the blood is __________.

Answer 5

bound to hemoglobin molecules inside the erythrocytes

Question 6

Which of the following statements is false?

1. Inadequate transport of oxygen in the blood can result in hypoxia.
2. Problems with oxygen exchange between alveoli and capillaries can result in hypoxia.
3. Hypoxia is linked with hypocapnia.
4. Inadequate oxygen reaching the alveoli can result in hypoxia.

Answer 6

Hypoxia is linked with hypocapnia

Question 7

A disease of the bone marrow that reduces erythrocyte synthesis will result in a __________.

Answer 7

decrease in the total number of oxygen-binding sites in the blood

Question 8

Carbon dioxide is transported in the blood primarily as __________.

Answer 8

HCO3-

Question 9

The __________ is a network of neurons in the medulla that creates a regular, repeating pattern of activity called the respiratory rhythm.

Answer 9

central pattern generator

Question 10

Most of the carbon dioxide produced by active cells is __________.

Answer 10

converted to carbonic acid, which dissociates to bicarbonate and hydrogen ions

Question 11

At which point in the systemic circuit of blood vessels would one expect to first find the highest levels of carbon dioxide in the blood?

Answer 11

Tissue capillaries

Question 12

At a normal arterial PO2 of 100 mmHg, what percentage of saturation is achieved by blood considered to be oxygenated?

Answer 12

98%

Question 13

Deoxygenated blood is not completely devoid of oxygen, actually having approximately __________ % oxygen.

Answer 13

73

Question 14

What would be a result of a decrease in plasma PO2?

Answer 14

a decrease in percent saturation of hemoglobin with oxygen

Question 15

Emphysema is characterized by __________.

Answer 15

increased compliance/decreased recoil and by loss of surface area