Quiz 6- muscular system

Excitability is the ability of skeletal muscle to

• recoil to its original resting length.

• shorten with force.

• respond to a stimulus.

• be stretched

In ________ contraction the amount of tension increases during contraction, but the length of the muscle does not change.

• isotonic

• isometric

• eccentric

• concentric

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

• Maintenance of posture

• Storage of calcium ions

• Movement

• Communication

The actin myofilaments are attached to the ________

• M line

• A band

• I band

• Z disks

The ________ is the functional unit of skeletal muscle because it is the smallest portion of the skeletal muscle capable of ________.

• muscle fiber; contracting

• sarcomere; contracting

• myofibril; contracting

• sarcomere; receiving a stimulus

Extensibility is the ability of skeletal muscle to

• shorten with force.

• be stretched

• recoil to its original resting length.

• create heat energy through contraction.

Elasticity is the ability of skeletal muscle to

• respond to a stimulus.

• lengthen passively.

• shorten with force.

• recoil to its original resting length.

Which of the following statements is true about the aging effects on skeletal muscle?

• Increasing exercise can improve muscle activity in elderly people.

• An active lifestyle will not reduce the loss of muscle mass.

• Muscle mass decreases due to increasing numbers of fast-twitch fibers.

• Motor unit size decreases with age.

The anterior hip muscle that flexes the thigh is the ________.

• gluteus maximus

• gluteus medius

• iliopsoas

• entire gluteal group

Which of the following muscles is NOT involved in mastication?

• The hyoid muscles

• The masseter

• The pterygoid

• The temporalis