Physio Final Exam

2)  Pressure and volume of gas in a container are related to temperature and number of gas molecules. This is known as ________ law.

6) Alveolar ventilation refers to the

15) Which of the following features of the alveolar sacs allows for the ease of diffusion of gasses?

19) Dalton's law states that

22)  In quiet breathing,

23)  Boyle's law states that gas volume is

25)  A typical value for intrapleural pressure is ________ mm Hg.

30)  If a student inhales as deeply as possible and then blows the air out until he cannot exhale any more, the amount of air that he expelled is his

33)  In the lungs, the

1. 35)  Flow of air

36) An increase in PCO2 would cause

37) Chronic inhalation of fine particles that reach the alveoli leads to ________ lung disease.

4)  Of the factors that influence diffusion of respiratory gases, the most variable and, therefore, 4) important factor to consider is the

6)  The lung pathology most likely to result from certain kinds of heart disease is

7)  Hypoxia resulting from fluid accumulation in the alveoli that cannot be corrected by oxygen 7) therapy can lead to

12)  At a PO2 of 70 mm Hg and normal temperature and pH, hemoglobin is ________% saturated with oxygen.

13)  Which of the following would make the oxygen-hemoglobin curve shift right?

shift to the right = decreased O2 affinity 

16) In the medulla oblongata, the nucleus tractus solitarius contains the ________ of neurons.

17)  The most important chemical regulator of respiration is

18)  An increase in the level of carbon dioxide in the blood will

19)  The expiratory neurons control the ________ muscles, whereas the inspiratory neurons control the 19) ________ muscles.

21) The Hering-Breuer reflex

58)  Carbon dioxide is more soluble in water than oxygen. To get the same amount of oxygen to dissolve in plasma as carbon dioxide, you would have to

57)  Jill lives in St. Louis, which is close to sea level. She decides to spend a month of her summer vacation working in the mountains outside of Denver. After a week in the mountains, what kinds of changes would you expect to see as Jill adapts to the higher altitude?

60)  A student in your lab volunteers to enter a hypoxic breathing chamber for 10 minutes, and his alveolar PO2 drops to 50 mm Hg. What other change would occur?

61)  A molecule that blocks the activity of carbonic anhydrase would

62) The chloride shift occurs when

63) Blocking afferent action potentials from the chemoreceptors in the carotid and aortic bodies would interfere with the brain's ability to regulate breathing in response to all EXCEPT which of the
following?

5) Which organ is NOT known to include a special portal system for blood?

6) Which artery/arteries branch(es) is/are most proximal to the beginning of the aorta at the heart?

9)  Which of the following statements about hydrostatic pressure is NOT true?

10)  Each of the following changes will result in increased blood flow to a tissue EXCEPT one. Identify the exception.

21) The action potential in a cardiac contractile cell causes

22)  Stretching a myocardial cell

23)  The rapid depolarization phase of the action potentials of myocardial contractile cells is due to  which ion(s)?

24)  During the plateau phase of the action potentials of myocardial contractile cells, which ion(s) is/are crossing the membrane?

28)  A typical action potential of a myocardial contractile cell lasts ________ millisecond(s).

of autorhythmic cells is = at least 150+msec

of skeletal muscle cells = 1-2msec

31) If channels are permeable to

34) The fibrous skeleton of the heart is important because it

37) In the condition known as complete heart block, what happens?