An intracellular messenger molecule generated by the binding of a chemical messenger (hormone or neurotransmitter) to a plasma membrane receptor on a cells outer surface; mediates intracellular responses to an extra-cellular (first) messenger.

GENERAL PHYSIOLOGY

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Question [CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]

An intracellular messenger molecule generated by the binding of a chemical messenger (hormone or neurotransmitter) to a plasma membrane receptor on a cell’s outer surface; mediates intracellular responses to an extra-cellular (first) messenger.

A	steroid hormone
B	hormone
C	second messenger
D	aldosterone

Explanation:

Detailed explanation-1: -Intracellular receptors When a hormone enters a cell and binds to its receptor, it causes the receptor to change shape, allowing the receptor-hormone complex to enter the nucleus (if it wasn’t there already) and regulate gene activity.

Detailed explanation-2: -1: Second messenger systems: The amino acid-derived hormones epinephrine and norepinephrine bind to beta-adrenergic receptors on the plasma membrane of cells.

Detailed explanation-3: -Internal receptors are found in the cell cytoplasm. Here, they bind ligand molecules that cross the plasma membrane; these receptor-ligand complexes move to the nucleus and interact directly with cellular DNA. Cell-surface receptors transmit a signal from outside the cell to the cytoplasm.

Detailed explanation-4: –Intracellular receptors are activated by signaling molecules that pass through the plasma membrane.

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