Cardiovascular System Quiz

What is the cardiac cycle?

• The sequence of events during which cardiac muscle contracts and relaxes in a single heartbeat.

• The process of blood flow through the arteries.

• The increase in heart rate before exercise.

• The volume of blood pumped by the heart in one minute.

What is vasodilation?

• The decrease in diameter of blood vessels.

• The increase in diameter of blood vessels.

• The contraction of heart muscles.

• The release of neurotransmitters.

What role do neurotransmitters play in exercise?

• They increase the diameter of blood vessels.

• They carry signals or information between neurons and cells.

• They decrease heart rate.

• They increase stroke volume.

What is cardiac output?

• The amount of blood pumped by the left ventricle in one contraction.

• The volume of blood pumped out of the heart in one minute.

• The increase in heart rate during exercise.

• The sequence of cardiac muscle contractions.

What is stroke volume?

• The amount of blood pumped by the heart in one minute.

• The amount of blood pumped by the left ventricle in one contraction.

• The increase in heart rate before exercise.

• The sequence of cardiac muscle contractions.

What is the role of the sinoatrial node (SAN) in heart rate control?

• It decreases heart rate during exercise.

• It increases heart rate during rest.

• It regulates heart rate by receiving information from nerves.

• It stops heart rate during maximal exercise.

Which nerve speeds up the heart by secreting noradrenalin?

• Vagus nerve

• Parasympathetic nerve

• Sympathetic nerve

• Atrioventricular nerve

What hormone is secreted by the vagus nerve to slow down the heart?

• Noradrenalin

• Acetylcholine

• Adrenaline

• Dopamine

During which type of exercise does stroke volume reach a peak?

• Rest

• Submaximal exercise

• Maximal exercise

• Moderate exercise

According to Starling's law, what causes the cardiac muscle to contract more forcefully?

• Increase in blood volume filling the heart

• Decrease in blood volume filling the heart

• Increase in heart rate

• Decrease in heart rate