Question

Classify each of the following according to whether it belongs to the Skeletal, Cardiac, or Smooth muscle types.

A) Voluntary control, involved in body movement, multiple nuclei located peripherally
B) Intercalated discs, cylindrical and branched, spontaneous contractions
C) Spindle-shaped, no striations, involved in the movement of hair and pupil size
D) None of the above characteristics

Answer 1

Skeletal muscle is under voluntary control and has multiple peripheral nuclei. Cardiac muscle contains intercalated discs, is branched, and operates involuntarily. Smooth muscle is spindle-shaped, lacks striations, and controls involuntary actions.

Step-by-step explanation:

Classification of Muscle Types

A) This description is referring to skeletal muscle. Skeletal muscle cells are long and cylindrical, they have multiple nuclei, and their nuclei are pushed to the periphery of the cell. These muscles are under voluntary control and are involved in body movement.

B) This description matches the characteristics of cardiac muscle. Cardiac muscle cells have intercalated discs, are cylindrical and branched, and have spontaneous contractions. Cardiac muscle is found in the heart and is responsible for pumping blood.

C) These features are indicative of smooth muscle. Smooth muscle cells are spindle-shaped, have no striations, and have a single nucleus. They are involved in involuntary actions such as the movement of hair and control of pupil size.

D) The provided characteristics do not match any muscle type, so the correct answer for this option would be None of the above characteristics.