Q: Which is notinvolvedas 2td messenger in Ca+2 mediatedhormoneï»¿?

Ionositoltriphosphate (IP3)& diacylglycerol (DAG) act as intracellular secondary messengers responsible for amplification of signal. IP3 , being water soluble, diffuses in the cytoplasm to stimulate the release of Ca+2 from endoplasmic reticulum of target cells. The latter activate many Ca+2 mediated reactions. DAG remains in the cell membrane to activate the enzyme protein kinase C. Certain body cells use more than one secondary messenger, e.g. in heart cells, c-AMP acts as a secondary messenger to stimulate the release of Ca2+ from sarcoplasmic reticulum of muscle fibre resulting in muscle contraction.Phospholipase is any of various enzymes that cleave particular bonds in the polar phosphate 'heads' of glyerophospholipids.

Question 1

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

Accepted Answer

Cyclic AMP and GMP act as intracellular mediators and affect the cell metabolism in various ways. According to the second messenger theory given by Sutherland the1st  messenger is hormone itself and the 2nd  messenger is cyclic AMP.

Question 2

In mechanism of hormone action, which of the following is not a second messenger?

Accepted Answer

Correct answer is D

Question 3

What is hormone?

Accepted Answer

Hormone is a chemical messenger produced by endocrine glands and secreted directly into the blood stream to exert a specific effect on a distant part of the body.

Question 4

........shows anti-allergic and anti-inflammatory effect.

Accepted Answer

Correct answer is B

Question 5

Which is the inhibitory hormone of GH?

Accepted Answer

Correct answer is C

Question 6

The chemical nature of hormones secreted by α&β cells of pancreas is:

Accepted Answer

Correct answer is D

Question 7

Which of the following cell does not secrete hormone?

Accepted Answer

Kupffer's cells occur in the lining of liver sinusoids and help in phagocytosis.

Question 8

Which of the following hormones are produced in the hypothalamus and stored in the posterior pituitary?

Accepted Answer

Correct answer is B

Question 9

Which of the following is not necessarily a property of all hormones?

Accepted Answer

Hormone do not belong to a single chemical group but are varied in their composition is polypeptide, proteins, amines or steroid.

Question 10

The feed back control mechanism is related with:

Accepted Answer

Correct answer is C

Question 11

Pheromone is:

Accepted Answer

Pheromones serve to conduct messages by smell and taste and affect the mutual behaviour of members of a species.

Question 12

Who is the "Father of Endocrinology"?

Accepted Answer

The father of endocrinology is Thomas Addison. The first endocrine disease reported was Addison's disease caused by destruction of adrenal cortex.

Question 13

Term 'hormone' was coined by:

Accepted Answer

Starling (1905) first used the term hormone for internal secretion.

Question 14

Receptors for protein hormones are located:

Accepted Answer

The molecules of amino acid derivatives, peptides or polypeptide (protein) hormones bind to specific receptor molecules located on the plasma membrane of target cells.

Question 15

Which one of the following flows directly into blood from the seat of its production to act on an organ away from it?

Accepted Answer

Correct answer is B

Question 16

Which is notinvolvedas 2td messenger in Ca+2 mediatedhormoneï»¿?

Accepted Answer

Ionositoltriphosphate (IP3​)& diacylglycerol (DAG) act as intracellular secondary messengers responsible for amplification of signal. IP3​ , being water soluble, diffuses in the cytoplasm to stimulate the release of Ca+2 from endoplasmic reticulum of target cells. The latter activate many Ca+2 mediated reactions. DAG remains in the cell membrane to activate the enzyme protein kinase C. Certain body cells use more than one secondary messenger, e.g. in heart cells, c-AMP acts as a secondary messenger to stimulate the release of Ca2+ from sarcoplasmic reticulum of muscle fibre resulting in muscle contraction.Phospholipase is any of various enzymes that cleave particular bonds in the polar phosphate 'heads' of glyerophospholipids.

Question 17

Hormones may be:

Accepted Answer

Hormones composition can be polypeptide proteins, amines or steroid.

Question 18

Which of the following statements is correct in relation to the endocrine system?

Accepted Answer

Correct answer is D

Question 19

Endocrine glands:

Accepted Answer

Endocrine glands are ductless gland their secretion flows directly into the blood stream.

Question 20

According to the accepted concept of hormone action, if receptor molecules are remoued from target organs:

Accepted Answer

Correct answer is C

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