Pulmonary Blood Flow

Question 1

Which of the following is true of alveolar and extra-alveolar vessels (bronchiole vessels)?

A. Get low O2 and high CO2 from the right ventricle via the Pulmonary A.

B. Returns slightly low O2 slightly high CO2 venous admixture to the left ventricle via Pulmonary vein

C. Send blood through pulmonary V. to the Left Ventricle

D. Get’s high O2 and low CO2 blood from the left ventricle via aorta

Answer 1

Send blood through pulmonary V. to the Left Ventricle

Question 2

What equation do we use to determine Pulmonary blood pressure (PBP)?

Answer 2

PBP= CO x PVR

Question 3

Which of the following has an affect on Pulmonary Vascular Resistance?

A. Number of capillaries

B. Number of open capillaries

C. Sympathetic Tone

D. Lung Volumes

E. All of the above

Answer 3

All of the above

Question 4

Why does the PVR drop during exercise despite the increase in Cardiac output/ blood flow?

Answer 4

More pulmonary capillaries open up

Question 5

T/F: At extreme low lung volume resistance decreases, while at extremely high lung volumes resistance increases

Answer 5

False; at extremely low and high volumes resistance incerases because stretch of the tissue compresses the capillaries

Question 6

Which of the following is the relation of arterial, alveolar, and venous pressure at the apex of the lung in an upright person?

A. P_a > P_A > P_V

B. P_A > P_a > P_V

C. P_a > P_V > P_A

D. None of the above

Answer 6

P_A > P_a > P_V

Question 7

Which of the following is the relation of arterial, alveolar, and venous pressure at the middle of the lung in an upright person?

A. Pa > PA > PV

B. PA > Pa > PV

C. Pa > PV > PA

D. None of the above

Answer 7

Pa > PA > PV

Question 8

Which of the following is the relation of arterial, alveolar, and venous pressure at the base of the lung in an upright person?

A. Pa > PA > PV

B. PA > Pa > PV

C. Pa > PV > PA

D. None of the above

Answer 8

Pa > PV > PA

Question 9

_____ is made by the endothelium and works to relax smooth muscle under normal conditions, while ______ and ______ are vasoconstrictors that are released under times of stress

Answer 9

NO is made by the endothelium and works to relax smooth muscle under normal conditions, while endothelin and thromboxane-A2 are vasoconstrictors that are released under times of stress

Question 10

In most places the Starling Forces, P_c and π_i push water out of the capillary. Because of the negative intrapleural pressure though, what 3 of the starling forces push water out of the capillary?

These 3 starling forces would cause the alveoli to be wet, which we dont want. So what structure helps keep the alveoli ‘dry’?

Answer 10

P_c , π_i , P_i

Lymphatics