Front

What is the primary energy source for muscle contraction?

Back

ATP (Adenosine Triphosphate) is the primary energy source needed for muscle contraction.

Front

What structure in muscle cells stores calcium?

Back

The Sarcoplasmic Reticulum is the structure that stores calcium in muscle cells.

Front

What is the contractile unit of a muscle called?

Back

The sarcomere is the contractile unit of a muscle.

Front

What is a crossbridge in muscle contraction?

Back

A crossbridge is where myosin binds to actin during muscle contraction.

Front

What is the sequence of events when deciding to move an arm?

Back

C) You decide you want to move your arm, B) An impulse travels along a nerve, A) Your arm moves.

Front

What role does calcium play in muscle contraction?

Back

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

Front

What is the function of myoglobin in muscle cells?

Back

Myoglobin stores oxygen in muscle cells, facilitating aerobic respiration.

Front

What is the difference between a motor unit and a sarcomere?

Back

A motor unit consists of a motor neuron and the muscle fibers it innervates, while a sarcomere is the structural unit of a muscle fiber.

Front

What is the role of ATP in muscle relaxation?

Back

ATP is required for the detachment of myosin heads from actin, allowing muscle relaxation.

Front

What is the sliding filament theory?

Back

The sliding filament theory explains how muscles contract by the sliding of actin and myosin filaments past each other.