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Test: Mechanism of Hormones & Hormonal Reactions - NEET MCQ


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Test: Mechanism of Hormones & Hormonal Reactions - Question 1

The steroid responsible for the balance of water and electrolytes in our body is

Detailed Solution for Test: Mechanism of Hormones & Hormonal Reactions - Question 1

Aldosterone secreted by the adrenal glands of the body is responsible for maintaining the sodium potassium ratio in the extracellular and intracellular fluids. It thus helps in the maintenance of electrolytes,body fluid volume ,osmotic pressure and blood pressure.

Test: Mechanism of Hormones & Hormonal Reactions - Question 2

Which of the following diseases is caused due to the excess secretion of thyroxine?

Detailed Solution for Test: Mechanism of Hormones & Hormonal Reactions - Question 2

Graves' disease is an immune system disorder that results in the overproduction of thyroid hormones (hyperthyroidism). Symptoms include anxiety, hand tremor, heat sensitivity, weight loss, puffy eyes and enlarged thyroid.

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Test: Mechanism of Hormones & Hormonal Reactions - Question 3

Which one of the following is not a second messenger in hormone action?

Detailed Solution for Test: Mechanism of Hormones & Hormonal Reactions - Question 3

Second messengers are the organic molecules and sometimes the metal ions, acting as intracellular signals, whose production or release usually amplifies a signal such as a hormone, received at the cell surface.
Sodium (Na) is not a second messenger to be discovered.
In addition to cyclic AMP, Cyclic Guanosine Monophosphate (CGMP) functions as a second messenger in certain cases.
Calcium ions (Ca++) also act as second messenger in phospholipase C-Ca+ second messenger system.

Test: Mechanism of Hormones & Hormonal Reactions - Question 4

 In the mechanism of action of a protein hormone, one of the second messengers is

Detailed Solution for Test: Mechanism of Hormones & Hormonal Reactions - Question 4

Hormones which with membrane bound receptors normally donot enter the target cells, but generate secondary messengers ( e.g : cyclic AMP, cGMP, DAG etc.) which in turn regulate cellular metabolism.

Test: Mechanism of Hormones & Hormonal Reactions - Question 5

 Chemically, hormones are

Detailed Solution for Test: Mechanism of Hormones & Hormonal Reactions - Question 5

Hormones are a diverse group of biochemicals, which perform a variety of roles in biological systems. Hormones are produced in endocrine glands. Hormones are responsible for maintenance of internal balance and developmental changes in the animal body. 

Chemically, hormones may be peptide (e.g., insulin), amines (e.g., catecholamines), proteins (e.g., growth hormone), steroid hormones (e.g., androgens). 

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