Abigail is learning about the human body in her biology class. She wonders, which of the following best describes the function of the heart valves?

• They pump blood into the arteries.

• They prevent the backflow of blood.

• They oxygenate the blood.

• They regulate blood pressure.

Benjamin is learning about the human body in his biology class. He needs to identify the type of blood vessel that carries blood away from the heart. Can you help him?

• Veins

• Capillaries

• Arteries

• Venules

During a science class experiment, Rohan accidentally cuts his finger. Which component of his blood is primarily responsible for stopping the bleeding by clotting?

• Red blood cells

• White blood cells

• Platelets

• Plasma

During a biology class, Anika is learning about the human heart. Her teacher asks, "What is the main function of the left ventricle in the heart?"

• To receive deoxygenated blood from the body

• To pump oxygenated blood to the body

• To receive oxygenated blood from the lungs

• To pump deoxygenated blood to the lungs

Nora visited her doctor for a routine check-up. During the examination, the doctor mentioned that one of the following is a common symptom of hypertension. Which one is it?

• Low blood sugar

• High blood pressure

• Low heart rate

• High cholesterol

Avery is learning about the human body in her biology class. She wonders, what is the primary role of white blood cells?

• To transport oxygen

• To fight infections

• To carry nutrients

• To remove carbon dioxide

Noah is studying the human circulatory system in his biology class. He learns about different types of blood vessels. Which blood vessel type is involved in the exchange of nutrients and gases with tissues?

• Arteries

• Veins

• Capillaries

• Arterioles

Ethan was reading a health article and came across the term 'atherosclerosis'. What does it refer to?

• A condition where the heart beats irregularly

• A disease characterized by the hardening of the arteries

• A disorder where blood clots form in veins

• A condition where the blood pressure is abnormally low

During a biology class, Priya learned about the components of blood. What is the main function of red blood cells?

• To fight infections

• To transport oxygen

• To clot blood

• To regulate body temperature

Zoe is studying the human circulatory system. She learns about different types of blood vessels. Which of the following is a characteristic of veins?

• They have thick, muscular walls.

• They carry blood away from the heart.

• They have valves to prevent backflow.

• They are involved in nutrient exchange.