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Question
Assertion :In cardiac muscles, impulses are transmitted rapidly. Reason: Gap junction allow quick passage of ions from one cell to the other.
Assertion :In cardiac muscles, impulses are transmitted rapidly. Reason: Gap junction allow quick passage of ions from one cell to the other.
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Solution
The correct option is B Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion
(1) The heart contains a small amount of specialized material called conductive tissue. This tissue is able to generate rhythmic electrical impulses without external stimulation. The sinoatrial (SA) node is located in the upper part of the right atrium. The SA node sets the basic heartbeat and is able to initiate and propagate the heartbeat without any external stimulation. It does this by generating an electrical impulse which causes the atria to contract. The conduction rate is about 75ms.(2) Specialized cell junctions occur at points of cell-cell and cell matrix contact in all tissues. The gap is spanned by channel-forming proteins (connexins). The channel they form allow inorganic ions and other small water-soluble molecules to pass directly from one cytoplasm of cell to the other. This helps coupling of the cells both electrically and metabolically.So the correct option is 'both assertion and reason are correct but reason is not the correct explanation for assertion'.
(1) The heart contains a small amount of specialized material called conductive tissue. This tissue is able to generate rhythmic electrical impulses without external stimulation. The sinoatrial (SA) node is located in the upper part of the right atrium. The SA node sets the basic heartbeat and is able to initiate and propagate the heartbeat without any external stimulation. It does this by generating an electrical impulse which causes the atria to contract. The conduction rate is about 75ms.
(2) Specialized cell junctions occur at points of cell-cell and cell matrix contact in all tissues. The gap is spanned by channel-forming proteins (connexins). The channel they form allow inorganic ions and other small water-soluble molecules to pass directly from one cytoplasm of cell to the other. This helps coupling of the cells both electrically and metabolically.
So the correct option is 'both assertion and reason are correct but reason is not the correct explanation for assertion'.
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