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Cardiac Muscle Anatomy Quiz

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Questions and Answers

During atrial systole, what happens to the pressure in the ventricles?

It remains the same.

It fluctuates significantly.

It decreases.

It increases. (correct)

What is responsible for creating the pulse in the circulatory system?

The opening of the AV valves.

Pressure waves from the semilunar valves closing. (correct)

The contraction of the ventricles.

The relaxation of the atria.

Which structure acts as the 'pacemaker' of the heart and sets the rhythm of the heartbeat?

AV valves

Semilunar valves

Sino-atrial node (correct)

Ventricles

What happens to artery pressure compared to ventricle pressure during ventricular systole?

Ventricle pressure is greater than artery pressure. Signup and view all the answers

Which phase of the cardiac cycle involves the closure of the AV valves?

Atrial systole Signup and view all the answers

How does cardiac output relate to heart rate and stroke volume?

Cardiac output depends on heart rate and stroke volume. Signup and view all the answers

What prevents the atrioventricular valves from turning inside out when the ventricle walls contract?

Tendinous cords Signup and view all the answers

Where does the deoxygenated blood enter after passing through the tricuspid valves?

Pulmonary artery Signup and view all the answers

Which blood vessels supply oxygenated blood to the heart muscle?

Coronary arteries Signup and view all the answers

What is the function of intercalated discs in muscle cells?

Synchronize contraction Signup and view all the answers

Where does the blood move after being pumped out of the left ventricle?

Aorta Signup and view all the answers

What is the purpose of semilunar valves in the heart?

Prevent blood backflow into ventricles Signup and view all the answers

What is the main function of the atrioventricular node (AVN) in the cardiac cycle?

Passing waves of electrical activity from the atria to the Bundle of His Signup and view all the answers

Which part of the heart is responsible for conducting waves of electrical activity to the Purkyne tissue?

Bundle of His Signup and view all the answers

What does the T wave represent in an ECG trace?

Repolarization of the ventricles Signup and view all the answers

Which condition is characterized by an extremely irregular heartbeat, potentially causing chest pain and fainting?

Fibrillation Signup and view all the answers

What is the role of haemoglobin in blood circulation?

Transporting oxygen and carbon dioxide Signup and view all the answers

How does tachycardia differ from bradycardia?

Bradycardia is a condition where the heart beats too fast, while tachycardia is when it beats too slow. Signup and view all the answers