Blood Flow

Question 1

Serotonin effect on flow

Answer 1

Vasoconstriction in response to tissue damage

Question 2

Histamine and bradykinin effect on flow

Answer 2

Arteriolar vasodilation
Increases capillary porosity allowing escape of large molecules
Causes edema in response to tissue damage

Question 3

If downstream venous system increases dilation locally, what happens to upstream arterioles

Answer 3

Increased flow in arterioles leads to increased shear on the vessel walls causing release of NO and subsequent vasodilation

Question 4

Coronary blood flow during systole and diastole

Answer 4

Ventricular contraction during systole creates high pressure (especially left ventricle) which constricts vasculature most notably near the endocardial surface

Question 5

What happens to vessels in areas experiencing hypoxia (in lungs)

Answer 5

Vasoconstriction, to reduce blood flow to areas of lung with low oxygen concentrations