A & P Muscular System Test

Front

What happens when calcium ions bind to troponin?

Back

Calcium ions binding to troponin causes tropomyosin to change shape and therefore exposes the myosin-binding sites on actin.

Front

Which is the thin myofilament?

Back

Actin

Front

What causes 'the burn' in your muscles?

Back

The accumulation of lactic acid in the muscles.

Front

Together, actin and myosin make up a?

Back

Sarcomere

Front

When a muscle contracts, the smallest part that contracts is a:

Back

Sarcomere

Front

What is the role of myosin in muscle contraction?

Back

Myosin interacts with actin to produce muscle contraction.

Front

What is a sarcomere?

Back

The basic contractile unit of muscle tissue.

Front

What is the function of tropomyosin in muscle contraction?

Back

Tropomyosin blocks myosin-binding sites on actin in a relaxed muscle.

Front

What is lactic acid and how does it relate to muscle fatigue?

Back

Lactic acid is a byproduct of anaerobic respiration that accumulates during intense exercise, leading to muscle fatigue.

Front

What is the difference between actin and myosin?

Back

Actin is a thin filament, while myosin is a thick filament involved in muscle contraction.