Coronary circulation and temperature regulation

Question 1

Why is the right heart better perfused?

Answer 1

1. Smaller afterload 2. Pressure gradient is more stable throughout cardiac cycle

Question 2

Does water have high conductivity or low?

Answer 2

High

Question 3

Does air have high conductivity or low?

Answer 3

Low

Question 4

What does vasodilation do to conductivity?

Answer 4

Increase

Question 5

What does vasoconstriction do to conductivity?

Answer 5

Decrease

Question 6

Sweating is controlled by what type of nerve fibers?

Answer 6

Cholinergic sympathetic

Question 7

What receptors regulate non-thermoregulatory sweating?

Answer 7

Alpha 1 (epi/ne)

Question 8

What does activation of the anterior hypothalamic-preoptic area heat sensitive neurons do to thermoregulation?

Answer 8

Induces sweating, cutaneous vasodilation

Question 9

What does the posterior hypothalamus do for thermoregulation?

Answer 9

1. Relay station for sensory inputs from periphery and anterior hypothalamus 2. Integrates response to warm or cold body

Question 10

What is the primary motor center for shivering?

Answer 10

Dorsomedial portion of posterior hypothalamus

Question 11

What initiates chemical thermogenesis?

Answer 11

SNS - heat production instead of ATP

Question 12

Thyroxine production is involved in what thermoregulatory process?

Answer 12

Adaptation to cold