Understanding the Circulatory System

What is the main function of the circulatory system?

• To transport blood, oxygen, and nutrients throughout the body.

• To regulate body temperature and produce hormones.

• To digest food and absorb nutrients.

• To filter waste products from the blood.

Name the main organ responsible for pumping blood in the body.

• Lungs

• Heart

• Kidneys

• Liver

What are the two main types of blood vessels in the circulatory system?

• Arteries and capillaries

• Arteries and veins

• Veins and lymphatics

• Capillaries and arteries

What is the role of red blood cells?

• To store nutrients and vitamins.

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

• To produce insulin for the body.

• To fight infections and diseases.

How does oxygen enter the bloodstream?

• Oxygen is transported by red blood cells from the liver.

• Oxygen is absorbed through the skin.

• Oxygen enters the bloodstream through the alveoli in the lungs.

• Oxygen enters the bloodstream via the stomach.

What is the liquid part of the blood called?

• serum

• white blood cells

• plasma

• red blood cells

What is the function of platelets in the blood?

• To produce antibodies for immune response.

• The function of platelets in the blood is to help stop bleeding by forming blood clots.

• To transport oxygen throughout the body.

• To regulate body temperature.

How does the heart ensure that blood flows in one direction?

• The heart uses valves to ensure blood flows in one direction.

• The heart relies on muscle contractions to direct blood flow.

• The heart uses arteries to control blood flow.

• The heart pumps blood in all directions.

What is the difference between arteries and veins?

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

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

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

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

Why is it important to keep the circulatory system healthy?

• It prevents hair loss and promotes hair growth.

• It helps in improving digestion and metabolism.

• It is essential for maintaining skin elasticity.

• It is important to keep the circulatory system healthy to ensure proper blood flow, nutrient delivery, and to reduce the risk of cardiovascular diseases.