Human A&P Muscle Physiology Review

Front

Which thin filament protein binds to Ca during muscle contraction?

Back

Troponin

Front

What is the minimal amount of stimulus needed to cause a muscle to contract?

Back

Threshold stimulus

Front

What neurotransmitter is stored in the axon terminal?

Back

Acetylcholine

Front

What substance accumulates in the muscle during sustained high intensity efforts?

Back

Lactic acid

Front

What symptoms would a person with a disease that inhibits the production of cholinesterase experience?

Back

Prolonged muscle contraction

Front

What is the role of actin in muscle contraction?

Back

Actin is a thin filament that interacts with myosin to facilitate muscle contraction.

Front

What is the all-or-none principle in muscle physiology?

Back

The all-or-none principle states that a muscle fiber will contract fully or not at all when stimulated.

Front

What is the function of tropomyosin in muscle contraction?

Back

Tropomyosin blocks the binding sites on actin for myosin when the muscle is relaxed.

Front

What is the neuromuscular junction?

Back

The neuromuscular junction is the synapse between a motor neuron and a muscle fiber.

Front

What is the role of calcium ions (Ca²⁺) in muscle contraction?

Back

Calcium ions bind to troponin, causing a conformational change that allows myosin to bind to actin.