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(a) Write the names of five endocrine glands found in the human body. Name the hormones secreted by each gland. 

(b) How do hormones reach the organs they control ? 

(c) Name the gland which controls the secretion of hormones from the pituitary. 

(d) How does our body respond when adrenaline is secreted in large amounts into the blood ? 

(e) Name the disease which occurs in adults due to the deficiency of iodine in the diet. What is the main symptom of this disease ?

1 Answer

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(a)(i) Pituitary – Growth.

(ii) Thyroid – Thyroxine.

(iii) Pancreas – Insulin.

(iv) Adrenal – Adrenaline.

(v) Testes – Testosterone.

(b)  The endocrine glands do not have ducts to secrete their hormones. They release hormones directly into the blood of a person and reach the concerned body part through the blood and act on it. 

(c)  Hypothalamus. 

(d)  The adrenaline hormone prepares our body to function at maximum efficiency during emergency situations like danger, anger etc. This adrenaline hormone increases our heartbeat, breathing rate, blood flow into muscles and causes liver to put more stored glucose into our blood. All these actions produce a lot of energy in our body and help us to cope up the emergency situations. Thus, when adrenaline is secreted in large amounts it prepares our body for action. 

(e)  Goitre – The neck of the person appears to be swollen due to the enlargement of thyroid gland located in the neck.

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