Question

question 1 (mandatory) (1 point)

which of the following types of muscle fiber is spindle-shaped without stripes or striations?

a) cardiac
b) rough
c) smooth
d) skeletal

Explanation:

Analyze muscle fiber characteristics

• Cardiac muscle: branched fibers, striated, involuntary.
• Skeletal muscle: cylindrical fibers, striated, multinucleated, voluntary.
• Smooth muscle: spindle-shaped (fusiform) fibers, non-striated (no stripes), single central nucleus, involuntary.

Match characteristics to options

• The question asks for "spindle-shaped without stripes or striations".
• This matches the histological definition of smooth muscle.

Answer:

• a) cardiac
• b) rough
• c) smooth (Correct answer)
• d) skeletal