Self-test questions: Chapter 27

. The diameter of the arterioles in most vascular beds is regulated by the parasympathetic nervous system.

True

False

. As the capillaries are the smallest vessels they are the main source of vascular resistance.

True

False

. All true veins have smooth muscle in their walls.

True

False

. Some large veins have both circular and longitudinal layers of smooth muscle in their walls.

True

False

. Cholinergic sympathetic fibres causes vasodilatation of the blood vessels supplying the sweat glands.

True

False

. The arterioles are innervated only by the sympathetic nervous system.

True

False

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