Muscle Contraction

Front

What does the all-or-none response mean in muscle contraction?

Back

When a muscle fiber contracts, it contracts completely.

Front

What causes an action potential in muscle cells?

Back

The imbalance of Na+ and K+.

Front

What initiates skeletal muscle contraction?

Back

A neuron sends a message to the muscle cell.

Front

What ions are involved in the imbalance within the muscle cell during contraction?

Back

Na+ (sodium) influx and K+ (potassium) efflux.

Front

What two chemicals are necessary for muscle contraction to occur?

Back

Calcium and ATP.

Front

Define muscle contraction.

Back

The process where muscle fibers shorten and generate force.

Front

What role does ATP play in muscle contraction?

Back

ATP provides the energy required for muscle contraction.

Front

What is the role of calcium ions in muscle contraction?

Back

Calcium ions bind to troponin, allowing actin and myosin to interact.

Front

What is the function of actin and myosin in muscle contraction?

Back

Actin and myosin are proteins that interact to produce muscle contraction.

Front

What is a sarcomere?

Back

The basic contractile unit of muscle tissue.