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Define the following:
(a) Exocrine gland
(b) Endocrine gland
(c) Hormone


(a) Exocrine gland : Glands which pour their secretions through the ducts eg Liver and Pancreas.

(b) Endocrine gland : Endocrine glands are glands of the endocrine system that secrete their products, hormones, directly into the blood rather than through a duct. They are ductless. 

(c)Hormone : Hormones are non-nutrient chemicals which act as intercellular messengers and are produced in trace amounts. 
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List the hormones secreted by the following

(1) Hypothalamus ,(2) Pituiltary gland , (3) Thyroid gland
(4) Parathyroid gland , (5) Adrenal gland, (6) pancreas

(7) Testis, (8) Ovary, (9) Thymus

(10) Atrium, (11) Kidney , (12) G–1 Tract.


Hormones                                   Target Gland
Melanotrophins (MSH)                 .................

 Hormones                                   Target Gland

(d) Gonadotrophins (LH, FSH)          ..........

Write short notes on the functions of the following hormones.

(a) Parathyroid hormone (PTH)
(b) Thyroid hormones
(c) Thymosins
(d) Androgens
(e) Estrogens
(f) Insulin and Glucagon.


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