CONCEPT REVIEW (The blood vessels)

Question 1

Most blood vessel walls have three distinct tissue layers.

What are they?

Answer 1

1. tunica interna, which surrounds the lumen where blood flows,
2. The middle tunica media,
3. Outermost tunica externa.

Question 2

________________ of the autonomic nervous system regulate contraction of smooth muscle fibers of the tunica media. An increase in sympathetic stimulation produces vasoconstriction while a decrease causes vasodilation.

Answer 2

Sympathetic fibers

Question 3

An increase in sympathetic stimulation of the tunica media produces? while a decrease causes vasodilation.

Answer 3

vasoconstriction

Question 4

An decrease in sympathetic stimulation of the tunica media produces?

Answer 4

vasodilation.

Question 5

The extent of smooth muscle contraction helps to regulate ______________

Answer 5

blood flow and blood pressure.

Question 6

Contraction of the tunica media can _____________ blood loss through a damaged artery or arteriole.

Answer 6

decrease

Question 7

Blood ejected from the heart flows through elastic arteries, ________________, and then ___________.

Answer 7

muscular arteries, arterioles

Question 8

Elastic arteries are those close to the __________and have highly elastic walls to accommodate the
surge of blood and propel blood onward when the ventricles are relaxing.

Answer 8

heart

Question 9

These arteries have lots of smooth muscle in the tunica media for greater vasoconstriction
and vasodilation to adjust blood flow to various regions of the body.

Answer 9

Muscular arteries