Chapter 4. Know our Organ Systems
(Class 5 – Our World)

Based on Chapter 4, “Know our organ systems” from the Class 5 EVS textbook, here are the answers to the “Improve Your Learning” section. APSCERT, ANDHRA PRADESH

Improve Your Learning

I. Conceptual Understanding

1. Name the parts of the circulatory system.

• The circulatory system consists of:

• Heart

• Blood

• Blood vessels (arteries and veins).

2. Which system is responsible for our body’s movement?

• The Skeletal System and Muscular System together support body movement.

3. What is inhalation and what is exhalation?

• Inhalation: The process of taking in oxygen-rich air into the lungs.

• Exhalation: The process of expelling carbon dioxide and water vapor from the lungs.

II. Questioning and Hypothesis

4. If you have a chance to meet a doctor (cardiologist), what type of questions would you ask about the heart?

• What is the role of the heart in the circulatory system?

• How can we keep our heart healthy?

• What causes heart diseases?

• How many times does the heart beat in a day?

• Why do athletes have slower heart rates?

III. Experiments and Field Observations

5. Place your hand on the heart and feel the heartbeat carefully. Run for some time and feel it again. Do you find any difference? Write the difference with reasons.

• Observation: The heartbeat increases after running.

• Reason: When we run, our muscles need more oxygen to produce energy. The heart beats faster to pump more oxygen-rich blood to the muscles and remove carbon dioxide efficiently.