With Regard to the Action of Hormones and Neurotransmitters on Cellular

question 7

Multiple Choice

With regard to the action of hormones and neurotransmitters on cellular receptors,which of these describes "amplification"?

• A)When the extracellular concentration of a chemical messenger reaches a very high level,it overwhelms transporter molecules and the chemical floods into the cell.
• B)Only hydrophilic first-messenger molecules can activate second-messenger molecules within the cell cytosol.
• C)A single first-messenger molecule activates multiple second-messenger molecules,each of which activate thousands of enzymes.
• D)Some cellular receptors have such low affinity for chemical ligands that it can require a million or more molecules to activate them.

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Fire Screens

Protective screens placed in front of fireplaces to prevent sparks and embers from escaping into the room.

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Electric Items

Devices or appliances that operate using electrical power, ranging from household electronics to industrial machinery.