Human Circulatory System Concepts

What is the primary role of the circulatory system in the human body?

• Digesting food

• Transporting essential molecules

• Producing hormones

• Filtering waste from the air

Which of the following is NOT transported by the circulatory system?

• Nutrients

• Gases

• Waste products

• Sound waves

Where is the heart located in the human body?

• In the abdominal cavity

• Between the lungs in the chest cavity

• In the brain

• Attached to the spine

How many chambers does the human heart have?

• Two

• Three

• Four

• Five

What is the main difference between oxygenated blood and deoxygenated blood in the heart?

• Oxygenated blood enters the right side, deoxygenated blood enters the left side.

• Oxygenated blood enters the left side, deoxygenated blood enters the right side.

• Both types of blood mix in the heart.

• Only oxygenated blood enters the heart.

Why is the human circulatory system described as a "closed system"?

• It is completely sealed off from the outside world.

• Blood is always contained within vessels and does not directly interact with body tissues.

• It only circulates blood in one direction.

• It has a limited amount of blood.

Which type of blood vessel has thick, muscular walls to withstand high pressure from the heart?

• Veins

• Capillaries

• Arteries

• Lymphatic vessels

What is the liquid part of blood called that holds molecules and cells?

• Red blood cells

• White blood cells

• Plasma

• Platelets

Which blood cells are responsible for transporting oxygen throughout the body?

• White blood cells

• Platelets

• Red blood cells

• Plasma

What is the main job of white blood cells in the body?

• Transport oxygen

• Help blood clot

• Fight against pathogens

• Carry nutrients