Question

Membrane receptors are involved in various types of cell signaling. Some membrane receptors function as _____ channels?

1) Ion
2) G-protein coupled
3) Enzyme-linked
4) Ligand-gated

Answer 1

Membrane receptors categorize into three types: ion channel-linked, G-protein-linked, and enzyme-linked receptors. Specifically, ligand-gated or ion channel-linked receptors open to allow ions to pass through when bound to a ligand.

Step-by-step explanation:

Membrane receptors play a crucial role in cellular communication in multicellular organisms, and they can be grouped into three main classes: ion channel-linked receptors, G-protein-linked receptors, and enzyme-linked receptors.

Among these, some membrane receptors function as ligand-gated channels, which are otherwise known as ion channel-linked receptors. These receptors, when bound to their specific ligands, form a pore through the plasma membrane allowing the passage of specific ions such as Na+, K+, Ca2+, or Cl-. This action is essential for the initiation of various cellular responses, including neurotransmission in neurons and muscle contraction.