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प्रश्न
The gland X which is located just below the brain in the human head secretes a chemical substance Y which controls the development of ones and muscles in the body of a person. Secretion of too little of substance Y as well as the secretion of too much of substance Y by the gland X leads to abnormal development of the body of a person.
(a) Name the gland X.
(b) What is the chemical substance Y?
(c) What happens if too little of substance Y is secreted?
(d) What happens if too much of substance Y is secreted?
(e) Name the system of glands in the human body of which gland X is a part.
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उत्तर
- X is the pituitary gland. It is located just below the brain.
- The chemical substance (Y) released from the pituitary gland is human growth hormone.
- Under-secretion of growth hormone leads to a condition known as dwarfism. In dwarfism, the person remains very short.
- Over-secretion of growth hormone causes a condition known as gigantism. In gigantism, the person grows very tall.
- The pituitary gland (X) is a part of the endocrine system.
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संबंधित प्रश्न
Why are some patients of diabetes treated by giving injections of insulin?
Name one hormone secreted by the pituitary gland
What is the name of in-built 'arrangement' in our body which controls the timing and amount of hormones released by various endocrine glands in the body?
Name one gland which acts only as an endocrine gland.
Which one term of the following includes the other three?
thyroid, ductless gland, thymus, pituitary, ovary
What substances are made by endocrine glands?
Name the hormones secreted by given endocrine glands :
Thyroid gland
Why is the use of iodised salt advisable?
State the functions of Thyroxine hormones.
State the functions of Adrenaline hormones.
Name the disease which occurs in adults due to the deficiency of iodine in the diet. What is the main symptom of this disease?
odine is necessary for the synthesis of which of the following hormone?
(a) adrenaline
(b) auxin
(c) thyroxine
(d) insulin
A doctor advised a person to take injection of insulin because :
(a) his blood pressure was high
(b) his heart beat was high
(c) his blood sugar was high
(d) his thyroxine level in blood was high
One of the following statements is not true about thyroxine. This is :
(a) Thyroid gland requires iron to synthesise thyroxine
(b) It regulates carbohydrate, protein and fat metabolism
(c) Iodine is essential for the synthesis of thyroxine
(d) Thyroid gland can enlarge due to lack of thyroxine
The endocrine gland whose malfunctioning causes diabetes disease is :
(a) pituitary
(b) pineal
(c) parathyroid
(d) pancreas
A and B are the two systems of control and coordination in the human body. The messages in system A are transmitted in the form of chemical substances C which travel comparatively slowly through the blood stream. The substances C are made in tissues D present in the head and trunk of human body. The messages in system b are transmitted very quickly in the form of electrical impulses through fibres E. The effect of messages transmitted by system b usually lasts for a much shorter time as compared to those transmitted by system A.
(a) Name the system A. What does system A consist of?
(b) Name the chemical substance C.
(c) What is tissue D? Name any five such tissues in the human body.
(d) Name the system B. What does system B consist of?
(e) Name the fibres E.
(f) State whether system A controls the working of system B or system B controls the working of system A.
A squirrel is in a scary situation. Its body has to prepare for either fighting or running away. State the immediate changes that take place in its body so that the squirrel is able to either fight or run?
A diabetic patient suffers from the deficiency of which hormone?
Assertion: On attaining puberty, breast size increases and reproductive organs develop in females.
Reason: Ovaries release the hormone progesterone in females.
Write any three responses which enable the animal body to deal with a scary situation.
