Class 7 Science
1. What are the major components of blood? What are their functions?
2. Describe the function of the heart.
3. Draw a diagram of the human heart.
4. Define dialysis. How is this technique useful?
5. How does a kidney work?
Answers
Answer:
1. Component
i)plasma.
ii)RBC
iii)WBC
iv)platelets
2.function of heart
A)It helps to pump oxygenated and deoxygenated blood throught the body to deliver continuous supply of oxygen for obtaining energy.
4.A)Dialysis is a treatment that filters and purifies the blood using a machine. This helps keep your fluids and electrolytes in balance when the kidneys can't do their job.
.. B)work-Dialysis maintains the body balance in the following ways: It controls blood pressure. It removes excess water and metabolic wastes from the body. Prevents chemicals such as potassium, bicarbonate and sodium from reaching hazardous levels.
5.Working of kidney.
Your kidneys remove wastes and extra fluid from your body. Your kidneys also remove acid that is produced by the cells of your body and maintain a healthy balance of water, salts, and minerals—such as sodium, calcium, phosphorus, and potassium—in your blood.
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Answer:
one component to plasma second RBC WBC platelets