Cardio 17

What is the function of the double-layered pericardium surrounding the heart?

• It acts as a barrier to infection and prevents displacement of the heart.

• It increases the heart rate and blood pressure.

• It stores oxygen for the heart.

• It regulates the temperature of the heart.

Answer explanation

The double-layered pericardium serves to protect the heart by acting as a barrier to infection and preventing its displacement within the thoracic cavity, ensuring proper heart function.

What is the function of the right-side pump of the heart?

• It is a high pressure system that pumps oxygenated blood through the systemic circulation.

• It is a low pressure system that receives deoxygenated blood and pumps it through the lungs.

• It separates the right and left sides of the heart.

• It directs the flow of blood through the heart chambers.

Answer explanation

The right-side pump of the heart is a low pressure system that receives deoxygenated blood from the body and pumps it to the lungs for oxygenation, distinguishing it from the left side, which handles oxygenated blood.

How does the left-side pump of the heart function?

• It receives deoxygenated blood and pumps it through the lungs.

• It is a low pressure system that directs blood flow.

• It receives oxygenated blood from the lungs and pumps it through the systemic circulation.

• It separates the right and left sides of the heart.

Answer explanation

The left-side pump of the heart receives oxygenated blood from the lungs and pumps it through the systemic circulation, delivering oxygen to the body's tissues.

What is the purpose of the cardiac valves in the heart?

• They pump deoxygenated blood through the lungs.

• They separate the right and left sides of the heart.

• They direct the flow of blood through the heart chambers.

• They receive oxygenated blood from the lungs.

Answer explanation

The cardiac valves ensure unidirectional blood flow through the heart chambers, preventing backflow and maintaining efficient circulation. This is crucial for proper heart function.

What is the function of the tricuspid valve in the heart?

• It prevents backflow of blood from the right ventricle into the right atrium.

• It allows oxygenated blood to enter the left atrium.

• It prevents blood from flowing into the pulmonary artery.

• It regulates blood flow between the left atrium and left ventricle.

Answer explanation

The tricuspid valve prevents backflow of blood from the right ventricle into the right atrium, ensuring unidirectional blood flow through the heart.

Through which valve does blood leave the right ventricle to enter the pulmonary artery?

• Tricuspid valve

• Mitral valve

• Pulmonic valve

• Aortic valve

Answer explanation

Blood leaves the right ventricle through the pulmonic valve, which directs it into the pulmonary artery for oxygenation. The tricuspid valve is between the right atrium and ventricle, while the mitral and aortic valves are on the left side.

Why is the pulmonary artery unique compared to other arteries?

• It carries oxygenated blood.

• It carries deoxygenated blood.

• It connects directly to the left atrium.

• It does not connect to the heart.

Answer explanation

The pulmonary artery is unique because it carries deoxygenated blood from the heart to the lungs, unlike other arteries that typically carry oxygenated blood. This is essential for oxygenating the blood before it returns to the heart.

What is the function of the mitral valve in the heart?

• It receives deoxygenated blood from the body.

• It controls the flow of blood from the left atrium to the left ventricle.

• It pumps blood into the pulmonary arteries.

• It ejects blood into the aorta.

Answer explanation

The mitral valve controls blood flow from the left atrium to the left ventricle, ensuring that oxygenated blood moves efficiently into the ventricle for distribution to the body.

Which part of the heart receives oxygenated blood from the pulmonary veins?

• Right atrium

• Left ventricle

• Left atrium

• Right ventricle

Answer explanation

The left atrium receives oxygenated blood from the pulmonary veins, which transport blood from the lungs. This is essential for delivering oxygen-rich blood to the left ventricle for distribution to the body.

Through which valve does the left ventricle eject blood into the aorta?

• Mitral valve

• Tricuspid valve

• Pulmonary valve

• Aortic valve

Answer explanation

The left ventricle ejects blood into the aorta through the aortic valve. The mitral valve is involved in blood flow from the left atrium to the left ventricle, while the tricuspid and pulmonary valves are associated with the right side of the heart.