A & P Muscular System Test

Front

What is the thin myofilament in muscle fibers?

Back

Actin

Front

What is the electrical impulse that travels through a motor neuron?

Back

Action potential

Front

What is the smallest part of a muscle that contracts?

Back

Sarcomere

Front

What is the thick myofilament in muscle fibers?

Back

Myosin

Front

What causes the sensation of 'the burn' in muscles during intense exercise?

Back

The accumulation of lactic acid in the muscles.

Front

What is the role of actin in muscle contraction?

Back

Actin forms the thin filaments that interact with myosin to facilitate muscle contraction.

Front

What is the role of myosin in muscle contraction?

Back

Myosin forms the thick filaments that pull on actin to shorten the muscle.

Front

What is a motor neuron?

Back

A motor neuron is a nerve cell that transmits signals from the brain and spinal cord to muscles, causing them to contract.

Front

What is a sarcomere?

Back

A sarcomere is the basic unit of a muscle's striated muscle tissue, defined as the segment between two neighboring Z-lines.

Front

What is lactic acid and how does it affect muscles?

Back

Lactic acid is a byproduct of anaerobic metabolism that can accumulate in muscles during intense exercise, leading to fatigue and discomfort.