Circulatory System - class 4 science - Question and Answer

Our body works like a machine, and to keep it running, blood must reach every part of it. The system that helps in the flow of blood is called the circulatory system. It mainly consists of the heart, blood, and blood vessels. The heart pumps blood, blood carries oxygen and nutrients, and blood vessels act like pipes to carry blood throughout the body. This system is very important because it keeps us alive, healthy, and full of energy. In this chapter, we will learn how the circulatory system works and why it is called the “lifeline” of our body.

Circulatory System - class 4 science - Question and Answer

What is circulatory system?

The organ system that circulates substances such as water, oxygen and nutrients within our body and also carries away waste products such as carbon dioxide to be thrown from the body is called circulatory system.

How many parts of circulatory system? Name them.

Ans:- There are three parts of circulatory system.
1-blood
2-blood vessels
3-heart

What is blood?

Ans:- Blood is the red liquid that flows around the body in blood vessels. It is a medium through which different substances like digested food, oxygen, carbon dioxide, etc. are transported through the body.

What are blood vessels?

Ans:- Blood flows across the body in tubes. these tubes are called blood vessels.

How many types of blood vessels? Name them.

Ans:- There are three types of blood vessels
1-arteries
2-veins
3-capillaries

What are arteries?

Ans:- Arteries are thick-walled blood vessels that carry pure blood away from the heart to all parts of the body. this blood contains oxygen and nutrients from the digested food.

What are veins?

Ans:- Veins are thin-walled blood vessels that carry impure blood containing carbon dioxide and other waste back to the heart.

What are capillaries?

Ans:- Capillaries are narrow and thin blood vessels. They have very thin walls. Nutrients, oxygen, carbon dioxide and other waste materials can pass through their walls.