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Question

Communication junctions between the cells of cardiac muscle are:


A

Intervertebral disk

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B

Intervertebral foramen

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C

Intercalated discs

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D

Interneurons

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Solution

The correct option is C

Intercalated discs


Intercalated disks are cross-bands that separate the opposing ends of cardiac muscle cells. These bands are the result of elaborate junctions of membranes at the cell's boundary. They help to hold adjacent cells together and transmit the force of contraction from cell to cell. Intercalated discs at some fusion points allow the cells to contract as a unit, i.e., when one cell receives a signal to contract, its neighbours are also stimulated to contract.
An intervertebral disk acts as shock absorber between each of the vertebrae in the spinal column by keeping the vertebrae separated when there is impact from activity.
Intervertebral foramen is an opening between vertebrae through which nerves leave the spine and extend to other parts of the body.
Interneuron is a neuron which transmits impulses between other neurons, especially as part of a reflex arc.

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