What is the circulatory system?
The circulatory system is a network of organs and vessels that moves blood, nutrients, oxygen, carbon dioxide, and hormones around the body.

What are the main parts of the circulatory system?
The main parts are the heart, blood, and blood vessels (arteries, veins, and capillaries).

What is the function of the heart in the circulatory system?
The heart pumps blood throughout the body, supplying oxygen and nutrients while removing carbon dioxide and waste.

What is blood made of?
Blood is made of red blood cells, white blood cells, platelets, and plasma.

What are arteries?
Arteries are blood vessels that carry oxygen-rich blood away from the heart.

What are veins?
Veins are blood vessels that carry deoxygenated blood back to the heart.

What are capillaries?
Capillaries are tiny blood vessels where the exchange of oxygen, carbon dioxide, and nutrients occurs.

How many chambers does the human heart have?
The human heart has four chambers: two atria and two ventricles.

What is the role of red blood cells?
Red blood cells carry oxygen from the lungs to the body and carbon dioxide back to the lungs.

What do white blood cells do?
White blood cells fight infections and protect the body from diseases.

What is pulmonary circulation?
Pulmonary circulation is the movement of blood between the heart and lungs.

What is systemic circulation?
Systemic circulation moves blood between the heart and the rest of the body.

Why is the circulatory system important?
It supplies oxygen and nutrients to cells and removes waste products like carbon dioxide.

What is the function of platelets?
Platelets help in blood clotting and wound healing.

What is plasma?
Plasma is the liquid part of blood that carries cells, nutrients, and waste products.

What is a heartbeat?
A heartbeat is the contraction and relaxation of the heart muscles to pump blood.

What causes the ‘lub-dub’ sound of the heart?
The sound is caused by the closing of heart valves during blood flow.

What is the role of the aorta?
The aorta is the largest artery that carries oxygen-rich blood from the heart to the body.

Why do we feel a pulse?
A pulse is felt when arteries expand and contract as blood is pumped through them.

What does the right side of the heart do?
It pumps deoxygenated blood to the lungs for oxygenation.

What does the left side of the heart do?
It pumps oxygenated blood to the rest of the body.

What is the role of hemoglobin?
Hemoglobin is a protein in red blood cells that carries oxygen.

What is blood pressure?
Blood pressure is the force of blood against the walls of blood vessels.

What is a blood vessel?
A tube that carries blood through the body, including arteries, veins, and capillaries.

What is the function of the valve in the heart?
Valves prevent the backflow of blood, ensuring it moves in the correct direction.

Why is it important to keep the circulatory system healthy?
A healthy circulatory system ensures proper blood flow, which is essential for overall health.

Name a disease that affects the circulatory system.
Hypertension (high blood pressure) is one such disease.

How can you maintain a healthy heart?
By eating a balanced diet, exercising, and avoiding smoking.

Why is oxygen important for the circulatory system?
Oxygen is essential for cell functions and is transported by the circulatory system.

How does exercise benefit the circulatory system?
Exercise strengthens the heart and improves blood circulation.

What would happen if arteries were blocked?
Blocked arteries reduce blood flow, leading to heart attacks or strokes.

How does the circulatory system interact with the respiratory system?
It transports oxygen from the lungs to the body and returns carbon dioxide to the lungs.

Why is the heart called a double pump?
It pumps blood to the lungs (pulmonary circuit) and to the body (systemic circuit).

What happens if the heart stops beating?
Blood circulation stops, leading to a lack of oxygen and potential organ failure.

What can you do to check your pulse?
You can feel your pulse by pressing lightly on your wrist or neck.

Why do athletes have lower resting heart rates?
Their hearts are more efficient, pumping more blood with each beat.

How does dehydration affect the circulatory system?
Dehydration thickens the blood, making circulation harder.

Why is iron important for red blood cells?
Iron is needed to form hemoglobin, which carries oxygen.

Why does the heart rate increase during exercise?
To pump more oxygen-rich blood to the muscles.

What could happen if the heart valves do not work properly?
Blood may flow backward, reducing the heart’s efficiency.