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प्रश्न
How does chemical coordination take place in animals?
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उत्तर
In animals, chemical coordination is coordinated by hormones. The organ system responsible for the synthesis and regulation of these hormones is known as the endocrine system. Hormones are secreted in very less amount by the endocrine glands. These glands being ductless, the secretions directly mix into the bloodstream. From there it moves to specific target organs where it shows its effects. For example, growth hormone is synthesized by the pituitary gland which mainly acts on the bones of a developing child and increases the height of the child.
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संबंधित प्रश्न
Why are some patients of diabetes treated by giving injections of insulin?
Name the hormones secreted by the given endocrine glands and specify one function.
Pancreas
Which gland secretes the growth hormone?
Name the hormones secreted by testes.
What part does the diet play in helping us to have a healthy thyroid gland?
Why do you need iodine in your diet?
Name the hormones secreted by given endocrine glands :
Parathyroid glands
Name the hormones secreted by given endocrine glands:
Adrenal glands
Write the names of all the major endocrine glands present in the human body. Which of these glands also function as exocrine glands?
Match the hormones given in column I with their functions given in column II :
| Hormones | Functions |
| (i) Thyroxine | (a) Causes breasts to develop in females |
| (ii) Adrenaline | (b) Causes the male to start producing sperms |
| (iii) Insulin | (c) Prepares the body for an emergency |
| (iv) Estrogen | (d) Controls the metabolic rate |
| (v) Testosterone | (e) Regulates the amount of sugar in blood |
Which hormone prepares the body for action?
Which of the following endocrine gland does not occur as a pair in the human body?
The underactive endocrine gland which causes goitre is :
(a) pancreas
(b) thyroid
(c) adrenal
(d) pituitary
Which of the following are often called glands of emergency?
(a) thyroid
(b) pituitary
(c) adrenal
(d) pancreas
Which is the target organ of both adrenaline and insulin?
(a) heart
(b) kidney
(c) liver
(d) pancreas
A gland W is located just below the stomach in the human body. The gland W secretes a hormone X. The deficiency of hormone X in the body causes a disease Y in which the blood sugar level of a person rises too much. The person having high blood sugar is called Z.
(a) Name (i) gland W, and (ii) hormone X.
(b) What is the function of hormone X?
(c) Name (i) disease Y, and (ii) person Z.
(d) What advice would you like to give to a person who is suffering from disease Y due to faulty life-style?
A and B are two pairs of glands that are present in the human endocrine system. The pair A is found only in females, whereas B is present only in males. Glands A make and secrete two hormones C and D, whereas glands B make and secrete only one hormone E. In addition to hormones, Glands A make gametes F, whereas glands B make gametes G.
(a) What are the glands A?
(b) What are the hormones C and D?
(c) What are the glands B? Name the hormone E.
(d) What are the gametes F and G?
(e) Which event in the life of males and females is associated with the secretion of the hormones C, D and E?
Assertion: On attaining puberty, breast size increases and reproductive organs develop in females.
Reason: Ovaries release the hormone progesterone in females.
The hormone which increases fertility in males is called:
