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प्रश्न
Which of the following does not act as an endocrine gland as well as an exocrine gland?
(a) testis
(b) ovary
(c) pituitary
(d) pancreas
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उत्तर
(c) Pituitary
The pituitary gland is an endocrine gland, while the ovary, testis and pancreas are heterocrine glands. Those glands which are partly exocrine (with duct) and partly endocrine (without duct) are known as heterocrine glands. Here, the exocrine part releases secretion into the duct, while the endocrine part releases hormones into blood.
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संबंधित प्रश्न
Why is the use of iodised salt advisable?
Why are some patients of diabetes treated by giving injections of insulin?
Name one hormone secreted by the pituitary gland
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Name the hormones secreted by testes.
Name the disease caused by the deficiency of thyroxine hormone in the body.
Which halogen element is necessary for the making of thyroxine hormone by the thyroid gland?
Name one gland which acts both as an endocrine gland as well as an exocrine gland.
Why do you need iodine in your diet?
Write the functions of testosterone and oestrogen hormones.
What is the function of insulin hormone? What type of patients are given insulin injections?
Which hormone gives boys a deep voice?
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 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.
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.
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