Essentials of Anatomy and Physiology

80

Skeletal muscle

(Approximately 430X)

A

Smooth muscle

(Approximately 430X)

B

Cardiac muscle

(Approximately 430X)

C

Intercalated

discs

Figure 4–6. Muscle tissues. (A) Skeletal. (B) Smooth. (C) Cardiac.

QUESTION:Which kinds of muscle cells have striations? What forms these striations?

Table 4–3 TYPES OF MUSCLE TISSUE

Type Structure Location and Function Effect of Nerve Impulses

Skeletal

Smooth

Cardiac

Large cylindrical cells with

striations and several

nuclei each

Small tapered cells with no

striations and one nucleus

each

Branched cells with faint stria-

tions and one nucleus

each

Attached to bones

• Moves the skeleton and
  produces heat
  Walls of arteries


• Maintains blood pressure
  Walls of stomach and intestines


• Peristalsis
  Iris of eye


• Regulates size of pupil
  Walls of the chambers of the heart


• Pumps blood

Essential to cause contraction

(voluntary)

Bring about contraction or

regulate the rate of con-

traction (involuntary)

Regulate only the rate of con-

traction