Body Fluids and CirculationHard
Question
In higher vertebrates,SA node helps in
Options
A.Conduction of blood
B.Initiation of heart beat
C.Opening of tricuspid valve
D.Opening of bicuspid valve
Solution
- The nodal musculature has the ability to generate action potentials without any external stimuli, i.e., it is autoexcitable. However, the number of action potentials that could be generated in a minute vary at different parts of the nodal system. The SAN can generate the maximum number of action potentials, i.e., 70-75 min–1, and is responsible for initiating and maintaining the rhythmic contractile activity of the heart. Therefore, it is called the pacemaker.
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