Circulatory System Review

Which chamber pumps oxygenated blood to the body?

• Right Atrium

• Right Ventricle

• Left Atrium

• Left Ventricle

Answer explanation

The left ventricle is responsible for pumping oxygenated blood to the body. It receives oxygen-rich blood from the left atrium and contracts to send it through the aorta, supplying the entire body.

What vessel carries deoxygenated blood from the body into the right atrium?

• Aorta

• Pulmonary Vein

• Superior and Inferior Vena Cava

• Pulmonary Artery

Answer explanation

The Superior and Inferior Vena Cava are the vessels that carry deoxygenated blood from the body back to the heart, specifically into the right atrium, making them the correct answer.

Which structure is the largest artery in the body?

• Pulmonary Artery

• Aorta

• Superior Vena Cava

• Inferior Vena Cava

Answer explanation

The aorta is the largest artery in the body, responsible for carrying oxygenated blood from the heart to the rest of the body. In contrast, the pulmonary artery carries blood to the lungs, and the superior and inferior vena cavae are veins.

Blood leaving the right ventricle is headed to the lungs through which vessel?

• Aorta

• Pulmonary Vein

• Pulmonary Artery

• Superior Vena Cava

Answer explanation

Blood from the right ventricle is pumped into the pulmonary artery, which carries it to the lungs for oxygenation. The aorta carries oxygenated blood to the body, while the pulmonary vein returns oxygenated blood from the lungs.

Which chamber receives oxygen-rich blood from the lungs?

• Left Atrium

• Right Atrium

• Right Ventricle

• Left Ventricle

Answer explanation

The left atrium receives oxygen-rich blood from the lungs via the pulmonary veins, making it the correct answer. The right atrium receives deoxygenated blood, while the right and left ventricles pump blood to the lungs and body, respectively.

What is the function of the right ventricle?

• Pumps oxygenated blood to the body

• Receives oxygenated blood from lungs

• Receives deoxygenated blood from body

• Pumps deoxygenated blood to the lungs

Answer explanation

The right ventricle pumps deoxygenated blood to the lungs for oxygenation. This is essential for the respiratory process, distinguishing it from the left ventricle, which pumps oxygenated blood to the body.

The pulmonary veins carry blood that is:

• Oxygenated from the lungs

• Deoxygenated from the body

• Deoxygenated from the lungs

• Oxygenated from the body

Answer explanation

The pulmonary veins carry oxygenated blood from the lungs to the heart, making 'Oxygenated from the lungs' the correct choice. This is essential for delivering oxygen to the body.

Which two structures return deoxygenated blood to the heart?

• Pulmonary Artery & Aorta

• Superior & Inferior Vena Cava

• Pulmonary Vein & Aorta

• Left Atrium & Right Atrium

Answer explanation

The Superior and Inferior Vena Cava are the main veins that return deoxygenated blood from the body to the right atrium of the heart, making them the correct answer. The other options involve structures that carry oxygenated blood.

Which chamber of the heart has the thickest muscle wall because it pumps blood to the whole body?

• Right Atrium

• Right Ventricle

• Left Atrium

• Left Ventricle

Answer explanation

The left ventricle has the thickest muscle wall because it needs to generate enough force to pump oxygenated blood throughout the entire body, unlike the other chambers which pump blood to nearby areas.

What causes the red blood cells to be sickle-shaped in sickle cell disease?

• A) A shortage of iron

• B) A defect in hemoglobin

• C) A blocked artery

• D) Thickened heart muscle

Answer explanation

Sickle cell disease is caused by a defect in hemoglobin, the protein in red blood cells. This defect leads to the distortion of red blood cells into a sickle shape, affecting their ability to carry oxygen.