The document is a worksheet about the circulatory system. It contains questions about the main components of the circulatory system, the functions of different blood cells, the names of different types of blood vessels, substances that move from blood into cells in capillaries, and key parts of the heart. It also asks students to identify blood vessels, heart chambers, and valves. Finally, it asks students to define blood pressure, systemic circulation, and blood groups and list ways to keep a healthy heart.

1. The Circulatory System Worksheet
1. Which of the following is NOT one of the three main components of the
circulatory system?
a. Heart b. Lungs c. Blood d. Blood vessels
2. More than half of your blood is made of a liquid called _________________.
3. Each type of blood cell has a different function. Explain the function of each
type of cell.
a. Function of Erythrocytes: __________________________________
b. Function of Platelets: _____________________________________
c. Function of Leukocytes: ___________________________________
4. Blood vessels that carry blood FROM the heart to the body are called
_________________.
5. Blood vessels that carry blood TO the heart from the body are called
_________________.
6. Name two substances that move from the blood into cells as the blood flows
through the capillaries. _____________________________________
7. The main artery of the body is called the _________________.

2. 8. Who am I?
a. Blood vessel that carries blood away from the heart
b. Blood vessels with single layer endothelium cells
c. Specialized muscles of the heart
d. Valve separating auricles from ventricles
e. Receiving chambers of the heart
f. Distributing chambers of the heart
9. Observe the image carefully and fill in the blanks.
a. Blood flows from the _______ side of the heart to the lungs where it
gets oxygenated.
b. This blood rich in oxygen then re-enters the heart from the _____ side.
c. This circulation of blood that occurs between the heart and lungs only
is called ___________ circulation.
d. The right auricle receives deoxygenated blood from different parts of
the body and passes it down to the ______ _________.
e. From here, it is transported to the lungs via the pulmonary
__________.
f. Oxygenated blood exits the lungs and enters the heart into the _____
_____ via the pulmonary _____.
10. Answer the following:
a. Define: (i) Blood pressure (ii) Systemic circulation
b. What is the difference between hypertension and hypotension?
a. Write a short note on Blood groups.
b. List out four ways to keep a healthy heart.