what is action potential
what is action potential
Dear Student,
Action potential is the electrical potential difference that develop across the plasma membrane at a site where stimulus is applied. This action potential is also termed as a nerve impulse.
When a stimulus is applied at a site , then that polarised site become freely permeable to Na+. The polarity of that site is reversed i.e. the outer surface of the membrane becomes negatively charged and the inner side becomes positively charged and hence depolarised. The next immediate site has a positive charge on the outer surface and a negative charge on its inner surface. As a result, a current flows on the inner surface from first site to next site.In the same way polarity of next site is reversed and action potential is generated at that site.This sequence is repeated along the length of the axon.
In this way impulse is generated and conducted through the
The heart consists of special cardiac musculature called nodal tissue. The Sinoatrial node (SAN) is a type of nodal tissue present at the upper right corner of the right atrium. It is also known as the pacemaker of the heart because the action potential required to start a heart beat is generated by the SAN. The action potential generated in the SAN is conducted towards the ventricles through the AVN and the AV bundles.
Dear Student,
Action potential is the electrical potential difference that develop across the plasma membrane at a site where stimulus is applied. This action potential is also termed as a nerve impulse.
When a stimulus is applied at a site , then that polarised site become freely permeable to Na+. The polarity of that site is reversed i.e. the outer surface of the membrane becomes negatively charged and the inner side becomes positively charged and hence depolarised. The next immediate site has a positive charge on the outer surface and a negative charge on its inner surface. As a result, a current flows on the inner surface from first site to next site.In the same way polarity of next site is reversed and action potential is generated at that site.This sequence is repeated along the length of the axon.
In this way impulse is generated and conducted through the
The heart consists of special cardiac musculature called nodal tissue. The Sinoatrial node (SAN) is a type of nodal tissue present at the upper right corner of the right atrium. It is also known as the pacemaker of the heart because the action potential required to start a heart beat is generated by the SAN. The action potential generated in the SAN is conducted towards the ventricles through the AVN and the AV bundles.
