Which of the following descriptions of the autonomic innervation of the cardiovascular system is FALSE?

A) Both sympathetic and parasympathetic neurons innervate smooth muscle in arterioles.
B) Only sympathetic neurons innervate smooth muscle in veins.
C) Sympathetic activity increases cardiac output, whereas parasympathetic activity decreases
cardiac output.
D) Only sympathetic neurons provide significant innervation of the contractile cells of the heart.
E) Both sympathetic and parasympathetic neurons innervate the SA node


Ans: A) Both sympathetic and parasympathetic neurons innervate smooth muscle in arterioles.

Biology & Microbiology

You might also like to view...

One of the basic principles of evolution is the concept of ____

a. genetic drift b. divergent physiology c. economic diversity d. a shared ancestor e. creationism

Biology & Microbiology

The hominoid genus Pongo includes:a

gorillas. b. gibbons. c. orangutans. d. chimpanzees. e. humans.

Biology & Microbiology

An inadequate supply of which of the cells depicted in Figure 44-2 may be responsible for anemia?


a. cell type A only
b. cell type B only
c. cell type C only
d. cell type D only
e. both cell type A and cell type C

Biology & Microbiology

What are the predicted phenotypes of the female children from the union of a woman who is heterozygous for

hemophilia and a man who has normal blood clotting characteristics? (Use the Punnett square to verify your answer.) a. all carriers b. 3 homozygous normal : 1 carrier c. 1 homozygous normal : 1 carrier

d. 1 hemophilia: 2 homozygous; normal : 1 carrier e. all hemophiliacs

Biology & Microbiology