Quiz on Cardiac Physiology

What is the function of the myocardium in the heart?

• To store blood

• To transmit electrical signals

• To produce hormones

• To filter waste

What is the term used to describe the ability of cardiac muscle cells to act as a single unit?

• Syncytium

• Myocardium

• Sarcomere

• Endocardium

Where is the sinoatrial node (SA node) located?

• In the left ventricle

• In the right atrium

• In the aorta

• In the pulmonary artery

What is the role of the sinoatrial node (SA node) in the heart?

• To pump blood

• To filter blood

• To initiate electrical signals

• To store oxygen

What is the function of the atrioventricular node (AV node)?

• It initiates the heartbeat.

• It transmits the electrical signal from the atria into the ventricles.

• It measures the heart rate.

• It pumps blood into the aorta.

What is the role of the bundle of His in the heart?

• It separates the atria.

• It forms the right and left bundle branches.

• It initiates the electrical signal.

• It measures blood pressure.

What is the normal heart rate initiated by the SA node without nervous system input?

• 50-60 beats per minute

• 60-70 beats per minute

• 70-80 beats per minute

• 80-90 beats per minute

What does an electrocardiogram (ECG) measure?

• Blood pressure

• Electrical activity of the heart

• Oxygen levels in the blood

• Heart muscle strength