A&P Ch 6 The Muscular System

Smooth muscle cells are ________.

??? striated involuntary branched

Which of the following muscles closes the jaw?

??? both masseter and temporalis sternocleidomastoid zygomaticus

Anaerobic glycolysis requires ________ to make ATP.

??? glucose oxygen

Which one of the following is NOT a criterion generally used in naming muscles?

??? method of attachment of the muscle to bone shape of the muscle action of the muscle

Endomysium covers ________.

??? smooth muscle only an individual muscle cell an entire muscle

Acetylcholine is ________.

A neurotransmitter that stimulates skeletal muscle

The mechanical force of contraction is generated by ________.

A sliding of thin filaments past thick filaments

While doing "jumping jacks" during an exercise class, your arms and legs move laterally away from the midline of your body. This motion is called ________.

Abduction

The movement opposite to abduction is ________.

Adduction

Muscles that perform opposite actions to one another are termed ________.

Antagonists

Striated involuntary muscle tissue is classified as ________ muscle.

Cardiac

Striated involuntary muscle tissue found in the heart is ________.

Cardiac muscle

The arrangement of fascicles in orbicularis oris is ________.

Circular

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

Contractility

The heads of the myosin myofilaments are called ________ when they link the thick and thin filaments together during skeletal muscle contraction.

Cross bridges

Which of the following is NOT a function of the muscular system?

Hematopoiesis

Contractions in which muscles shorten and produce movement are known as ________.

Isotonic contractions

A motor neuron and all of the skeletal muscle fibers it stimulates are termed a ________.

Motor unit

An inherited disease that causes muscles to degenerate and atrophy is known as ________.

Muscular dystrophy

The muscle that closes each eye is the ________.

Orbicularis oculi

The point of muscle attachment to an immovable or less movable bone is known as the ________.

Origin

The ________ is an organelle that wraps and surrounds the myofibril and stores calcium.

Sarcoplasmic reticulum

Which type of muscle tissue contracts most quickly upon stimulation?

Skeletal

The epimysium covering on the outside of the muscle can blend into cordlike ________ or sheetlike ________.

Tendons; aponeuroses

A sarcomere is ________.

The contractile unit between two Z discs