Question

Answer these questions:
1)Why is it believed that people living in mountains are more prone to heart attacks?
2)What is the significance of sweat formation in humans?
3) What prevents the mixing of oxygen-rich blood and carbon dioxide-rich blood in the human heart? Explain in details.
4) Sponges and hydra neither require a circulatory fluid nor a circulatory system .why?
5) Paheli notices water being pulled up by the motor pump to an overhead tank. She how water moves to great heights in tall trees standing next to it. Can you explain why?
6) Sometimes doctors inject medicines directly into our bloodstream. Where do they inject it, in the arteries or in the veins? Explain with reasons.

Answer 1

2nd →perspiration also known as sweating is the production of fluids secreted by sweat glands in the skin of mammals two types of sweat glands can be found in the humans eccrine gland and apocrine gland