Author Question: Local myogenic regulation of blood vessel diameter and thus blood flow through a vessel is an ... (Read 169 times)

ENagel · **on:** Jun 25, 2018

Local myogenic regulation of blood vessel diameter and thus blood flow through a vessel is an example of:

a. autonomic regulation.
b. somatic regulation.
c. autoregulation.
d. metabolic regulation.

Question 2

Blood flow is affected by: (select all that apply)

a. blood viscosity.
b. blood vessel diameter.
c. blood pressure.
d. blood vessel length.
e. blood composition.

kaillie · **Reply #1 on:** Jun 25, 2018

Answer to Question 1

ANS: C
The myogenic hypothesis proposes that autoregulation originates in vascular smooth muscle, pre-sumably of the arterioles, as a response to changes in arterial perfusion pressure. It is not a part of autonomic, somatic, or metabolic regulation.

Answer to Question 2

ANS: A, B, C, D
Resistance to flow is generally greater in longer tubes because resistance increases with length but decreases with a wider diameter. Blood flow varies inversely with the viscosity of the fluid. Thick fluids move more slowly and experience greater resistance to flow than thin fluids. In-creased blood pressure decreases blood flow because resistance is increased. Blood volume, not composition, plays a role in blood flow.