Cardio - case study 12

Question 1

What causes light headedness when standing quickly from a supine position?

Answer 1

cerebral ischemia due to a decrease in MAP - cerebral blood flow is maintained constand as long as arterial pressure is between 60-140 mmHg

Question 2

Where are baroreceptors located?

Answer 2

carotid sinus - for orthostatic hypotension, receptors increased sympathetic outflow to the heart and blood vessels: stimulated B1 adrenergic receptors and a1 receptors on vascular smooth muscle

Question 3

Arteriolar and venoconstriction are mediated by

Answer 3

alpha 1 receptors

Question 4

Why does walking help with orthostatic hypotension?

Answer 4

muscular activity compressed veins in her legs & decreased venous capicitance