Assertion (A). In cardiac muscles , impulses are transmitted rapidly .
Reason (R) . Gap junctions allow quick passage of ions from one cell to the other.

Options

A. Both A and R are true and R is the correct explanation of A
B. Both A and Rare true, but R is not the correct explanation of A
C. A is true, but R is false
D. A is false, but R is true

Answer

A

Explanation

Gap junctions allow various molecules and ions to pass freely between cells. These junctions are expressed in virtually all tissues and cells, but most notably in cell types that are involved in direct electrical cumrnunications, such as neurons and cardiac muscles.