Maharashtra Board Class 4 EVS A look inside the body

Q: Which parts of our body do we use for seeing, walking, hearing, and writing?

A: (1) Seeing – Eyes

(2) Walking – Legs

(3) Hearing – Ears

(4) Writing – Hands

 

Q: What are external organs? Can you give examples?

A: External organs are parts of the body that are visible on the outside. Examples include ears, nose, arms, and legs.

 

Q: Why are some body parts called sensory organs?

A: Certain body parts are called sensory organs because they help us become aware of the environment around us. They include eyes, ears, nose, tongue, and skin.

 

Q: What is an internal organ?

A: An internal organ is an organ situated inside the body, performing specific functions necessary for bodily processes.

 

Q: Why is the oesophagus the only internal organ located in the thoracic cavity?

A: The oesophagus is located in the thoracic cavity because it needs to transport food from the mouth to the stomach, which involves passing through the chest area.

 

Q: How are the flexible walls of the oesophagus useful?

A: The flexible walls of the oesophagus allow it to expand and contract, facilitating the movement of food from the throat to the stomach.

 

Q: Why does the heart contract and relax continuously?

A: The heart contracts and relaxes continuously to pump blood throughout the body, ensuring oxygen and nutrients are delivered to cells and waste products are removed.

 

Q: Why does the chest swell up when we breathe in?

A: The chest swells up when we breathe in because the lungs expand to take in air, causing the chest cavity to enlarge.

 

Q: What are the functions of the lungs?

A: The lungs are responsible for supplying oxygen to the body by taking in air when we breathe in and expelling carbon dioxide when we breathe out.

 

Q: Which internal organ is situated between the lungs in the thoracic cavity?

A: The heart is situated between the lungs in the thoracic cavity.