12th Grade Anatomy & Physiology Study Guide

What is the ability of muscle tissue to respond to stimuli called?

• Contractility

• Extensibility

• Excitability

• Elasticity

Fill in the blank: The ability of muscle tissue to shorten when stimulated is called ____.

• Contractility

• Elasticity

• Excitability

• Extensibility

The ability of muscle tissue to be stretched without tearing is:

• Elasticity

• Contraction

• Relaxation

• Stiffness

Which type of muscle tissue is voluntary and striated?

• Cardiac Muscle

• Smooth Muscle

• Skeletal Muscle

Fill in the blank: Cardiac muscle is ____ and found in the heart.

• Involuntary, striated

• Involuntary, non-striated

• Voluntary, striated

• Voluntary, non-striated

The basic unit of muscle tissue is:

• Muscle fiber

• Myofibril

• Myocyte

• Sarcomere

Calcium binds to troponin to shift tropomyosin and expose myosin-binding sites on actin.

• Calcium

• Magnesium

• Sodium

• Potassium

Fill in the blank: Myosin (thick filaments) pulls on ____ (thin filaments) to shorten the sarcomere.

• actin

• tropomyosin

• α-actinin

• desmin

The function of the sarcolemma is:

• It encloses the muscle fiber and facilitates conduction of electrical impulses

• It stores calcium ions

• It synthesizes proteins

• It provides energy for muscle contraction

What is required for myosin heads to bind, pull, and release actin?

• The binding of myosin heads to actin requires ATP (adenosine triphosphate) and calcium ions.

• The binding requires only ATP.

• It requires ADP and calcium ions.

• It requires ATP and a special enzyme to trigger binding.