Q4 of 39 Page 117

Name atleast two hormones which result in fluctuation of Ca++ level.

The two hormones which results in the fluctuation of Ca++ levels are:

• Thyrocalcitonin (TCT): It lowers the levels of Ca++ and K+ in the blood and promotes the formation of bone in the body.


• Parathyroid hormone: When the Ca++ in our blood goes too low, the parathyroid glands make more parathyroid hormone (PTH). The Increased levels of Parathyroid hormone (PTH) cause the bones to release their Ca++ into the blood.


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2

In old age, people often suffer from stiff and inflamed joints. What is this condition called? What are the possible reasons for these symptoms?

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Exchange of calcium between bone and extracellular fluid takes place under the influence of certain hormones

a. What will happen if more of Ca++ is in extracellular fluid?


b. What will happen if very less amount of Ca++ is in the extracellular fluid?


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Rahul exercises regularly by visiting a gymnasium. Of late he is gaining weight. What could be the reason? Choose the correct answer and elaborate.

a. Rahul has gained weight due to accumulation of fats in body.


b. Rahul has gained weight due to increased muscle and less of fat.


c. Rahul has gained weight because his muscle shape has improved.


d. Rahul has gained weight because he is accumulating water in the body.


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Radha was running on a treadmill at a great speed for 15 minutes continuously. She stopped the treadmill and abruptly came out. For the next few minutes, she was breathing heavily/fast. Answer the following questions.

a. What happened to her muscles when she did strenuously exercised?


b. How did her breathing rate change?