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.
Create a free account to view solution
View Solution FreeMore Body Fluids and Circulation Questions
Which organ is considered as ″Graveyard of RBCτ where most of them are destroyed by macrophages...Saturated dietary fats increase the risk of heart disease by...Which of the following is different from others in absence of muscular coat...Single heart circuit occurs in...Which of the following statement s are wrong ? (i) Leucocytes disintegrate in the spleen and liver. (ii) RBC, WBC, and b...