Control Of Blood Vessels Intrinsic control
Order 59474930
Control Of Blood Vessels Intrinsic control
13.1 Arterioles and the terminal arteries
a. lack basal tone if not stimulated tonically by sympathetic fibres.
b. regulate local blood flow through a tissue.
c. regulate the mean arterial blood pressure.
d. can regulate the number of capillaries perfused with blood at any
one moment.
e. increase capillary pressures when they contract.
13.2 Resistance vessel tone is
a. raised by the endothelial secretion of endothelin.
b. reduced by a rise in the pressure of blood in the lumen.
c. raised by the endothelial secretion of nitric oxide.
d. reduced by endothelium-derived hyperpolarization factor (EDHF)
e. raised by vasoactive agents when tissue metabolic rate increases.
13.3 The myogenic response
a. is the dilatation of arterial vessels in response to a rise in blood pressure.
b. is brought about by a fall in sympathetic fibre activity.
c. is mediated by membrane potential changes that alter Ca2 channel activity.
d. helps to maintain a constant glomerular filtration rate.
e. increases cerebral blood flow when arterial pressure rises.
Control Of Blood Vessels Intrinsic control
13.4 Nitric oxide
a. dilates large veins and large arteries.
b. is responsible for flow-induced dilatation in conduit arteries during exercise.
c. contributes to the low basal tone of pregnancy.
d. mediates vascular smooth muscle contraction by acetylcholine.
e. mediates erection of the penis.
13.5 The increase in blood flow to human skeletal muscle during moderate,
rhythmic exercise
a. is due chiefly to the accompanying rise in arterial blood pressure.
b. is almost linearly proportional to the increase in muscle O2 consumption.
c. is due partly to the activation of sympathetic vasodilator fibres.
d. is due partly to a fall in interstitial K concentration.
e. may be due partly to local adenosine formation.
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