What is the function of the Aortic Valve in the human heart?

• To prevent backflow of blood into the left atrium

• To prevent backflow of blood into the left ventricle

• To regulate blood flow from the heart to the lungs

• To regulate blood flow from the heart to the rest of the body

Which chamber of the heart receives oxygen-rich blood from the lungs?

• Left Atrium

• Right Atrium

• Left Ventricle

• Right Ventricle

Identify the vessel that carries oxygen-poor blood from the lower body to the heart.

• Pulmonary Artery

• Aorta

• Superior Vena Cava

• Inferior Vena Cava

What is the role of the Pulmonary Artery in the circulatory system?

• It carries oxygen-rich blood to the body.

• It carries oxygen-poor blood to the lungs.

• It carries oxygen-rich blood to the heart.

• It carries nutrients to the heart.

Identify the valve that is located between the right atrium and right ventricle.

• Mitral Valve

• Aortic Valve

• Tricuspid Valve

• Pulmonary Valve

What is the primary function of arteries in the circulatory system?

• To carry blood toward the heart

• To carry blood away from the heart

• To facilitate nutrient absorption

• To produce blood cells

Where does the exchange of nutrients and gases primarily occur within the blood vessels?

• Arteries

• Veins

• Capillaries

• Heart

Which type of blood vessel is responsible for carrying blood back toward the heart?

• Arteries

• Capillaries

• Veins

• Atria

Which type of blood vessel has a thicker wall and a larger middle layer compared to the other?

• Capillaries

• Veins

• Arteries

• Venules

What is the characteristic thickness of capillary walls?

• Composed of multiple cell layers

• One-cell thick

• Three layers thick

• Variable thickness