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Learning:Blood and its Components Video Lecture - Class 7

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1. What is blood made up of?
Ans. Blood is made up of several components, including red blood cells, white blood cells, platelets, and plasma.
2. What is the function of red blood cells in the blood?
Ans. Red blood cells, also known as erythrocytes, are responsible for carrying oxygen from the lungs to all the cells in the body. They contain a protein called hemoglobin that binds to oxygen and transports it to different tissues and organs.
3. What are the different types of white blood cells found in the blood?
Ans. There are several types of white blood cells, including neutrophils, lymphocytes, monocytes, eosinophils, and basophils. Each type plays a specific role in the immune system, such as fighting infections, producing antibodies, or regulating inflammatory responses.
4. What is the role of platelets in the blood?
Ans. Platelets, also called thrombocytes, are responsible for blood clotting. When a blood vessel is damaged, platelets form a plug to stop bleeding. They release clotting factors and help in the formation of a fibrin mesh that seals the wound.
5. What is plasma and what does it contain?
Ans. Plasma is the liquid component of blood that makes up about 55% of its volume. It is mostly composed of water, but it also contains various proteins, hormones, electrolytes, waste products, and nutrients. Plasma helps transport these substances throughout the body and plays a crucial role in maintaining the body's fluid balance.
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