Physiology of Muscle

Striated involuntary muscle tissue is classified as ________ muscle.

• smooth

• cardiac

• skeletal

• tendon

Muscle tissue has the ability to shorten when adequately stimulated, a characteristic known as ________.

• contractility

• elasticity

• extensibility

• irritability

Anaerobic glycolysis requires ________ to make ATP.

• glucose

• creatine phosphate

• both oxygen and glucose

• oxygen

Endomysium covers ______

• entire muscle

• muscle fiber

• fascicle

• myofibrils

A sarcomere is _______

• The contractile unit between two Z discs.

• The nonfunctional unit of skeletal muscle

• the wavy lines on a muscle cell

• a compartment in a microfilament

Acetylcholine is _______

• A source of energy for muscle contraction

• a component of thick myofilaments

• An oxygen binding protein

• A neurotransmitter that stimulates skeletal muscle

The region where a motor neuron comes in close contact with a single muscle cell is called the ________.

• motor unit

• neuromuscular junction

• sarcomere

• synaptic cleft

A bundle of muscle fibers is names a _____.

• sarcromere

• myofibril

• fascicle

• muscle group

Perimysium covers what part of the muscle

• myofibril

• muscle cell

• entire muscle

• fascicle

What is the role of calcium in muscle contraction?

• allows the actin to connect with the myosin

• moves the tropomyosin out of the way

• gives the cell energy to contract

• give myosin the energy to move actin