Exam #2: Circulation Overview

Question 1

What three body systems work together to maintain pH?

Answer 1

Circulatory, respiratory and renal

Question 2

Which two valves are associated with the left heart?

Answer 2

• AV: mitral (bicuspid)

- SL: aortic

Question 3

Which two valves are associated with the right heart?

Answer 3

• AV: tricuspid

- SL: pulmonary

Question 4

What is systole? Is this depolarization or repolarization?

Answer 4

Contraction (depolarization)

- Ventricles emptying (ejection of blood)

Question 5

What is diastole? Is this depolarization or repolarization?

Answer 5

Relaxation (repolarization)

- Ventricles filling

Question 6

When does most myocardial perfusion occur?

Answer 6

Disatole (relaxation and ventricular filling)

Question 7

How does vessel diameter relate to resistance?

Answer 7

• Wider vessel = less resistance

- Narrower vessel = more resistance

Question 8

Where does the largest pressure drop occur in the heart? Where is the pressure the highest?

Answer 8

Arterioles

- Highest in aorta and arteries

Question 9

What is the relationship between velocity and area if flow is constant?

Answer 9

• Larger area (capillaries) = smaller velocity

- Smaller area (aorta) = larger velocity

Question 10

Where in the body is a series pattern of vessels seen?

Answer 10

Heart and lungs

Question 11

Where in the body is a parallel pattern of vessels seen? During exercise, how does this change?

Answer 11

Rest of body besides heart and lungs (high in renal, GI and skeletal muscle)
- During exercise, skeletal muscle gets most of the cardiac output