What is the primary function of the circulatory system?

• To support the immune system exclusively

• To control body temperature

• To transport gases only

• To circulate blood and transport various substances

Which organ is central to the circulatory system?

• Lungs

• Heart

• Liver

• Kidneys

What does pulmonary circulation involve?

• Blood flow between the heart and limbs

• Blood flow between the heart and lungs

• Blood flow between the heart and brain

• Blood flow between the heart and liver

Which chambers of the heart are known as the lower chambers?

• Valves

• Septum

• Ventricles

• Atria

Which circulation type handles the transport of blood from the heart to the rest of the body?

• Renal circulation

• Pulmonary circulation

• Systemic circulation

• Coronary circulation

What type of blood vessel carries blood away from the heart?

• Venules

• Arteries

• Capillaries

• Veins

What is the main function of red blood cells?

• To fight infections

• To carry oxygen

• To carry nutrients

• To remove waste products

Which cells in the blood are primarily responsible for immunity?

• Platelets

• White blood cells

• Red blood cells

• Plasma cells

What is the role of platelets in the blood?

• Fighting pathogens

• Clotting blood

• Carrying hormones

• Transporting oxygen

How much blood does an average adult human body contain?

• About 2 gallons

• About 3 gallons

• About 0.5 gallons

• About 1.5 gallons