Muscular System Slides 56, 58, 59, 64-78

ACh is broken down by ________, an enzyme that prevents further contraction of the muscle cell.

Calcium returns to the _____ after the muscle contraction.

• Synapse

• Sarcoplasmic Reticulum

• Sarcolemma

• Crossbridge

Which of the following is the regulatory protein that covers actins binding site after a muscle contraction?

• Myosin

• Troponin

• Tropomyosin

• Endomysium

After a contraction, the resting membrane potential is restored. This means that the internal surface of the cell has what type of charge?

• Positive

• Negative

• Neutral

The sodium-potassium pump moves Na+ (sodium) _____ the cell.

• Into

• Out of

The sodium-potassium pump moves K+ (potassium) _____ the cell.

• Into

• Out of

______ is a condition in which muscle becomes unable to contract even when stimulated.

• Muscle tone

• Muscle atrophy

• Resistance training

• Muscle Fatigue

True or false: Isometric contractions occur when muscle do NOT shorten, no movement occurs.

• True

• False

Isotonic contractions occur when the muscle _______, and movement occurs.

• Elongate

• Fatigue

• Shorten

• Atrophy

______ is the state of continuous partial contractions.

• Muscle tone

• Muscle atrophy

• Resistance training

• Muscle Fatigue