Health Science 1 Muscle (slides 1-12)

What type of muscle is circular that opens/closes to allow for passage of substances?

• Cardiac

• Skeletal

• Sphincter

• Smooth

Which characteristics of muscles allow them to respond to a stimulus?

• Contractibility

• Excitability

• Extensibility

• Elasticity

This facia covers one myofibril.

• Endomysium

• Perimysium

• Epimysium

• Motor Unit

What type of fascia covers the entire muscle?

• endomysium

• permysium

• epimysium

• skin

Fine muscle motor units in the hand control a ____ number of myofibrils, and gross motor muscle units control a _____ number of myofibrils.

• small, small

• small, large

• large, small

• large, large

The most proximal/superior portion of a muscle is the ______, the most distal/inferior portion is the ________.

• Origin, Insertion

• Insertion, Origin

• Origin, Action

• Insertion, Innervation

While sitting in your chair, you squeeze your knees together. What type of contraction is this?

• Isotonic

• Concentric

• Eccentric

• Isometric

While performing a sit-up exercise, when you are raising your shoulder blades off the mat is the ______ portion and when you are lowering your trunk back to the mat is the _____portion.

• isometric, eccentric

• concentric, eccentric

• eccentric, concentric

• concentric, isometric

When contracting the biceps concentrically, what must occur?

• The agonist, biceps must relax.

• The antagonist, the biceps must relax.

• The agonist, the triceps, must relax.

• The antagonist, the triceps, must relax.

Cam reports that he can run for hours without fatiguing. Cam probably has a genetic advantage of _____ fibers.

• Fast twitch ,Type 2

• Slow twitch, Type 1

• Antagonistic, Type 1

• Concentric, Type 2