Muscular System Review

What is the smallest contractile unit of a muscle?

• fascicle

• muscle fiber

• sarcomere

• myofibrils

The ions that are responsible for binding to the troponin-tropomyosin complex and 'unlocking' the active sites on actin is _____.

• Sodium

• Calcium

• Potassium

• Magnesium

What is the name of the protein that makes up the thick filaments?

• actin

• myosin

• myoglobin

• titin

What is the name of the main protein that makes up the thin filaments in the muscle cell?

• Actin

• Myosin

• Myoglobin

• Titin

If muscle cells are stimulated repeatedly without adequate periods of rest, lactic acid accumulates, and the muscle will lose its ability to contract. This is known as:

• Atrophy

• Fatigue

• Debt

• Hypertrophy

Tags

NGSS.HS-LS2-3

assist action of an agonist

• prime movers

• agonists action

• antagonists

• synergist

antagonist

• assists action of muscle contraction

• against action of muscle contraction

• against growth of muscle fibers

• increase of angle during muscle contraction

The deltoid muscle gets its name ____________________.

• Because of its shape

• Because of its location

• Because of the direction of muscle fibers

• Because of its tendons of origin

Name this muscle.

• deltoids

• latissimus dorsi

• gluteus maximus

• gastrocnemius

Name this muscle.

• deltoids

• latissimus dorsi

• gluteus maximus

• gastrocnemius