Q.

Hormones are called chemical signals that stimulate specific target tissues. Their action depend on the presence of receptors on the respective target tissues. Which of the following is the correct location of these receptors in case of protein hormones ?

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a

Extracellular matrix

b

Blood

c

Plasma membrane

d

Nucleus

answer is C.

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Detailed Solution

Protein hormones which interact with membrane-bound receptors normally do not enter the target cell, but generate second messengers (e.g., cyclic AMP, IP3 , Ca++ etc) which in turn regulate cellular metabolism.

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