Question

connexons/gap junctions are involved in ____

- synaptic

- direct contact

- paracrine

- endocrine

Answer 1

Here, the correct answer is direct contact.

Explanation -

Gap auctions are found in the animal cells, the gap junctions are found between the cell wall of two adjacent cells.

Gap junctions connect the two cells through direct contact. The gap junctions are made of the two hemichannels(each in one cell) and hemichannel consists of six proteins known as connexons. The gap junctions are very much similar to the plasmodesmata in the plants in their function. They allow the various signalling molecules, ions, and electrical impulses to pass through them.

Synaptic junctions are found between the two neurons cells, where the two cells are separated by some distance, the electrical impulses are carried inside the neuron, while in the synaptic junction the impulses are carried in the form of chemical impulses. Neurotransmitters carry the impulses in the chemical form in the synaptic junctions.

In the paracrine signalling, the signal is transferred from one cell to its adjacent cells by transfer of small molecules. The sender cell sends molecules and the receiver cell has receptors in the cell membrane for them.

In the endocrine signalling, the signalling molecules are released into the blood because the endocrine glands produce hormones which act on the cells located at distant. The signalling is maintained by the help of hormones.

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