Understanding the Circulatory System

What is the primary function of the heart?

• To digest food in the stomach.

• To filter waste from the blood.

• To circulate oxygen in the lungs.

• To pump blood throughout the body.

How many chambers does the human heart have?

• 3

• 4

• 5

• 2

What are the main components of blood?

• Red blood cells, white blood cells, and hormones.

• Muscle cells, nerve cells, and connective tissue.

• Plasma, electrolytes, and enzymes.

• Red blood cells, white blood cells, platelets, and plasma.

What is the role of red blood cells?

• To fight infections in the immune system.

• To store nutrients in the liver.

• To produce insulin in the pancreas.

• The role of red blood cells is to transport oxygen and carbon dioxide in the bloodstream.

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

• Arteries

• Veins

• Capillaries

• Venules

What is the function of veins in the circulatory system?

• Veins are responsible for pumping blood throughout the body.

• Veins filter toxins from the blood before it reaches the heart.

• Veins carry oxygenated blood away from the heart.

• The function of veins is to return deoxygenated blood to the heart.

What is plasma and what does it contain?

• Plasma is a solid that contains only atoms.

• Plasma is a liquid that contains water and minerals.

• Plasma is an ionized gas that contains ions, electrons, and neutral particles.

• Plasma is a type of energy that contains only light particles.

How do white blood cells contribute to the immune system?

• White blood cells contribute to the immune system by identifying, attacking, and eliminating pathogens, and coordinating the immune response.

• White blood cells primarily transport oxygen throughout the body.

• White blood cells are responsible for producing hormones.

• White blood cells mainly function in the digestive system.

What is the difference between arteries and veins?

• Veins have thicker walls than arteries and carry blood away from the heart.

• Arteries transport oxygen-rich blood away from the heart; veins return oxygen-poor blood to the heart.

• Arteries and veins both carry oxygen-rich blood; the difference is in their size.

• Arteries carry carbon dioxide-rich blood to the heart; veins transport oxygen-rich blood away from the heart.

What is the significance of capillaries in the circulatory system?

• Capillaries are responsible for pumping blood throughout the body.

• Capillaries enable the exchange of substances between blood and tissues.

• Capillaries are the largest blood vessels in the circulatory system.

• Capillaries transport oxygen from the lungs to the heart.