The Cardiovascular System

What is the role of blood vessels in the cardiovascular system?

• To digest food

• To transport blood

• To produce hormones

• To store energy

What is the role of the fibrous pericardium?

• Protects the heart and anchors it

• Pumps blood

• Filters blood

• Stores blood

The apex of the heart is directed toward the ________.

• left hip

• right shoulder

• left shoulder

• right hip

What is the role of the myocardium?

• Protect the heart

• Contract to pump blood

• Line the heart chambers

• Store blood

During ventricular contraction, the pressure inside the ventricles ______.

• Decreases

• Remains the same

• Increases

• Fluctuates

What is the condition of the AV valves when atrial pressure is greater than ventricular pressure?

• A) AV valves closed

• B) AV valves open

• C) Semilunar valves open

• D) Semilunar valves closed

During the operation of the semilunar valves, what happens when intraventricular pressure falls?

• Semilunar valves open

• Blood is pushed into the ventricles

• Blood flows back from arteries

• AV valves close.

What is the function of the semilunar valves in the heart?

• Prevent backflow into the atria

• Prevent backflow into the ventricles

• Pump blood into the atria

• Pump blood into the ventricles.

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

• It acts as the heart's pacemaker

• It pumps blood to the lungs

• It filters blood

• It stores oxygen

During which phase are the atria completely relaxed and the ventricles filling with blood?

• A) Atrial systole

• B) Atrial diastole

• C) Ventricular systole

• D) Ventricular diastole