Paper B Revision

Front

What is the role of ATP in muscle contraction?

Back

It breaks down into ADP and phosphate to release stored energy.

Front

What is the rapid change in polarity across the axon membrane as the nerve impulse occurs?

Back

Action potential.

Front

What structure stores Calcium in the muscle cell?

Back

Sarcoplasmic Reticulum.

Front

What is the function of the urethra in the excretory system?

Back

Transport urine out of the body.

Front

What is a crossbridge?

Back

Where myosin head binds to myosin binding site on actin.

Front

What is the primary energy currency of the cell?

Back

ATP (Adenosine Triphosphate).

Front

What is the function of troponin in muscle contraction?

Back

Troponin binds calcium ions and causes a conformational change that allows myosin to bind to actin.

Front

What is the difference between action potential and resting potential?

Back

Action potential is the rapid change in membrane potential during a nerve impulse, while resting potential is the stable, negative charge of a neuron at rest.

Front

What is the role of calcium ions in muscle contraction?

Back

Calcium ions trigger the interaction between actin and myosin by binding to troponin.

Front

What is the sarcoplasmic reticulum?

Back

A specialized endoplasmic reticulum in muscle cells that stores calcium ions.