NCERT Solutions for Class 7 Science Chapter 11
Important NCERT Questions
7th Chapter 11 Transportation in Animals and Plants
NCERT Books for Session 2022-2023
CBSE Board and State Board
Questions No: 9
Why is blood needed by all the parts of a body?
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Blood transports substances like digested food from the small intestine to the other parts of the body. It carries oxygen from the lungs to the cells of the body. It also transports waste for removal from the body. So, it acts as a carrier of various substances. Every part of the body needs certain substances to perform its functions. Additionally, every part creates some waste products for removal. Blood is needed by all parts of the body so that various substances can be supplied to them and waste can be removed from them.
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Blood is vital for the body as it performs several essential tasks. It delivers oxygen to all body cells, providing energy for daily activities. Nutrients like sugars and proteins are carried by blood from the digestive system to nourish organs and tissues, supporting growth and repair. Blood also collects waste products from cells, like carbon dioxide, and transports them to be expelled from the body. White blood cells in blood fight off germs, keeping the body healthy. Additionally, blood carries hormones that help regulate body functions. Its role in oxygenation, nourishment, waste removal, immunity, and hormonal balance is crucial for maintaining a healthy body.