Front

What is the function of a valve in the heart?

Back

A valve prevents blood from flowing backward, ensuring unidirectional blood flow through the heart chambers.

Front

In what units is blood pressure measured?

Back

Blood pressure is measured in millimeters of mercury (mm Hg).

Front

Describe the correct flow of blood starting from the right atrium.

Back

The correct flow is: Right atrium → Right ventricle → Pulmonary artery.

Front

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

Back

The sinoatrial (SA) node acts as the natural pacemaker of the heart, initiating electrical impulses that regulate heartbeats.

Front

Where does unoxygenated blood enter the heart from the upper body?

Back

Unoxygenated blood enters the right atrium from the superior vena cava.

Front

What is the primary function of the aorta?

Back

The aorta is the main artery that carries oxygenated blood from the left ventricle to the rest of the body.

Front

What is the difference between the right and left atrium?

Back

The right atrium receives unoxygenated blood from the body, while the left atrium receives oxygenated blood from the lungs.

Front

What is blood pressure?

Back

Blood pressure is the force exerted by circulating blood on the walls of blood vessels, typically measured in mm Hg.

Front

What are Purkinje fibers?

Back

Purkinje fibers are specialized fibers that conduct electrical impulses throughout the ventricles, facilitating coordinated heart contractions.

Front

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

Back

The AV node receives impulses from the SA node and delays them before passing them to the ventricles, ensuring proper timing of heart contractions.