Anatomy Chapter 6 test

The A band within a skeletal muscle fiber is indicate by letter?

A

What enzyme breaks down acetylcholine into acetic acid and choline to prevent continued contraction of the muscle fiber?

Acetylcholinesterase

The I band within a skeletal muscle fiber is indicated by letter?

B

The H Zone of a sarcomere contains no actin filament while the skeletal muscle is at rest (noncontractile state)

D

A smooth, sustained contraction, with no evidence of relaxation?

Fused

Contractions in which muscle shorten and produce movement are known as?

Isotonic contractions

The epimysium is represented by?

Label A

The myofilament composed of actin is indicated by ________.

Label C

What organelle wraps the myofibril and stored in calcium?

Sarcoplasmic reticulum

Which of the following is an example of an isometric contraction?

pushing against an immovable wall

Jason injured his hamstring muscle group during football practice. He will be unable to perform.

Thigh extension and knee flexion

The type of muscle tissue pictured in the figure is ________.

smooth muscle