Question

Which one of the following muscle types has an intrinsic system of excitation
Select one:

a. Skeletal muscle

b. Smooth muscle

c. Visceral muscle

d. Cardiac muscle

CLEAR MY CHOICE

Question 5

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Answer 1

Answer:

a.skeletal muscle

Explanation:

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Answer 2

Smooth muscle (so-named because the cells do not have striations) is present in the walls of hollow organs like the urinary bladder, uterus, stomach, intestines, and in the walls of passageways, such as the arteries and veins of the circulatory system, and the tracts of the respiratory, urinary, and reproductive systems (Figure 1ab). Smooth muscle is also present in the eyes, where it functions to change the size of the iris and alter the shape of the lens; and in the skin where it causes hair to stand erect in response to cold temperature or fear.

This diagram shows the structure of smooth muscle. To the left of the figure, a small diagram of the stomach is shown. To its immediate right, a magnified view of the muscle fibers are shown and a further magnification highlights the structure of these cells. Below these drawings is a micrograph showing smooth muscle tissue cells.

Figure 1. Smooth Muscle Tissue. Smooth muscle tissue is found around organs in the digestive, respiratory, reproductive tracts and the iris of the eye. LM × 1600. (Micrograph provided by the Regents of University of Michigan Medical School