8: Autonomics

Question 1

A1 adrenergic receptor functions

Answer 1

SM contraction, vasoconstriction

Question 2

Vagus N - symp or parasymp?

Answer 2

Parasymp

Question 3

Vagus N - what receptors does it bind on heart?

Answer 3

Muscarinic cholinergic receptors

Question 4

Major regulator of autonomic responses

Answer 4

Hypothalamus

Question 5

Blood flow through kidney

Answer 5

Afferent arteriole -> glomerular caps -> efferent arteriole

Question 6

From what do peritubular capillaries arise from?

Answer 6

Efferent arterioles

Question 7

Innervation type to the kidneys

Answer 7

Extensive sympathetic innervation and minor parasymp

Question 8

Short and long term effects of symp stimulation of kidneys

Answer 8

Short: maintains BP
Long: increases blood volume to maintain BP

Question 9

Majority of adrenergic receptors on heart?

Answer 9

B1 receptors

Question 10

Three parts of heart affected by sympathetics from most to least affected

Answer 10

SA node -> AV node -> Purkinje fibers

Question 11

Where is the heart are parasymps active?

Answer 11

SA node, AV node, Purkinje fibers

Question 12

Other stimulation to vascular smooth muscle in the heart besides norep from symp stimulation

Answer 12

Epi acts on a1 adrenergics from chromaffin cells in adrenal medulla

Question 13

Renin to angiotensin II

Answer 13

1. Angiotensinogen -> angiotensin I via renin

2. Angiotensin I -> angiotensin II via ACE in lungs