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What is the primary function of the traverse tubules in excitation-contraction coupling?

To transmit the electrical signal from the atria to the ventricles

To facilitate the contraction of the cardiac muscle

To generate the action potential

To release calcium ions (correct)

During which phase of the cardiac cycle does the heart pump blood out of the ventricles?

Systole (correct)

Refractory period

Isometric contraction

Diastole

What is the relationship between the electrocardiogram and the cardiac cycle?

The electrocardiogram is a measure of the heart rate

The electrocardiogram is a measure of the blood pressure

The electrocardiogram is a graphical representation of the electrical activity of the heart (correct)

The electrocardiogram is a measure of the cardiac output

What is the function of the atria as primer pumps?

To prime the ventricles for contraction Signup and view all the answers

What is the purpose of the refractory period in the cardiac cycle?

To prevent the heart from entering into an uncontrolled rhythm Signup and view all the answers

What is the role of calcium ions in excitation-contraction coupling?

To facilitate the contraction of the cardiac muscle Signup and view all the answers

What is the term for the period during which a muscle is unable to respond to a stimulus?

Refractory period Signup and view all the answers

What is the process by which the electrical signal from the action potential triggers muscle contraction?

Excitation-contraction coupling Signup and view all the answers

What is the term for the sequence of events in the heart that includes atrial contraction, ventricular contraction, and relaxation?

Cardiac cycle Signup and view all the answers

What is the electrical signal that can be recorded from the heart using electrodes on the skin?

Electrocardiogram Signup and view all the answers

What is the primary mechanism by which the heart regulates its pumping activity?

The Frank-Starling mechanism Signup and view all the answers

What is the period during which the heart muscle is unable to respond to a new stimulus?

Refractory period Signup and view all the answers

What is the process by which an electrical signal triggers muscle contraction in the heart?

Excitation-contraction coupling Signup and view all the answers

What is the term for the electrical signal that triggers muscle contraction in the heart?

Action potential Signup and view all the answers

What is the process by which the heart regulates its pumping activity in response to changes in blood volume and pressure?

Frank-Starling mechanism Signup and view all the answers

What is the term for the graphical representation of the heart's pumping activity during a cardiac cycle?

Volume-pressure diagram Signup and view all the answers

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