Explore the Circulatory System

What is the main organ of the circulatory system?

• lungs

• kidneys

• liver

• heart

Answer explanation

The heart is the main organ of the circulatory system, responsible for pumping blood throughout the body. It supplies oxygen and nutrients to tissues and removes waste products, making it essential for maintaining life.

How many chambers does the heart have?

• 4

• 5

• 3

• 2

Answer explanation

The heart has 4 chambers: two atria and two ventricles. This structure allows for efficient circulation of blood throughout the body, making 4 the correct answer.

What are the two types of blood vessels?

• Veins and lymphatics

• Arteries and capillaries

• Arteries and veins

• Capillaries and arteries

Answer explanation

The two main types of blood vessels are arteries and veins. Arteries carry blood away from the heart, while veins return blood to the heart, making them essential for circulation.

What is the function of arteries?

• To transport deoxygenated blood from the body to the heart.

• To filter waste products from the blood.

• The function of arteries is to transport oxygenated blood from the heart to the body.

• To store blood for later use.

Answer explanation

Arteries are responsible for transporting oxygenated blood from the heart to the body, delivering essential oxygen and nutrients to tissues. This distinguishes them from veins, which carry deoxygenated blood back to the heart.

What is the role of veins in the circulatory system?

• Veins transport deoxygenated blood back to the heart.

• Veins are responsible for pumping blood throughout the body.

• Veins carry oxygenated blood away from the heart.

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

Answer explanation

Veins play a crucial role in the circulatory system by transporting deoxygenated blood back to the heart, which is essential for the heart to pump it to the lungs for oxygenation.

What is the process of blood circulation called?

• Excretion

• Respiration

• Circulation

• Digestion

Answer explanation

The process of blood circulation is called circulation. It involves the movement of blood throughout the body, delivering oxygen and nutrients while removing waste products, distinguishing it from other processes like excretion, respiration, and digestion.

What is the main function of blood?

• To produce hormones

• The main function of blood is to transport oxygen and nutrients throughout the body.

• To store waste products

• To regulate body temperature

Answer explanation

The main function of blood is to transport oxygen and nutrients throughout the body, which is essential for cellular function and overall health. Other options, while important, do not capture the primary role of blood.

What do red blood cells carry?

• Waste products and proteins

• Nutrients and hormones

• Electrolytes and enzymes

• Oxygen and carbon dioxide

Answer explanation

Red blood cells primarily carry oxygen from the lungs to the body's tissues and transport carbon dioxide back to the lungs for exhalation. Therefore, the correct answer is 'Oxygen and carbon dioxide'.

How does oxygen get transported in the blood?

• Oxygen is dissolved directly in the plasma.

• Oxygen is transported by white blood cells.

• Oxygen is carried by platelets in the blood.

• Oxygen is transported in the blood by binding to hemoglobin in red blood cells.

Answer explanation

Oxygen is primarily transported in the blood by binding to hemoglobin in red blood cells, allowing efficient delivery to tissues. The other options are incorrect as they do not accurately describe oxygen transport.

What is the name of the disease caused by blocked arteries?

• Heart failure

• Stroke

• Coronary artery disease

• Peripheral artery disease

Answer explanation

Coronary artery disease is caused by the buildup of plaque in the coronary arteries, leading to blockages. This condition restricts blood flow to the heart, distinguishing it from other options like heart failure or stroke.