Interactive Physiology 2.0 Cardiovascular System: Electrical Activity of the Hea
ID: 3524773 • Letter: I
Question
Interactive Physiology 2.0 Cardiovascular System: Electrical Activity of the Heart Worksheet 1. The intrinsic conduction system coordinates contraction of the heart chambers by setting the direction and speed of 2. Within the intrinsic conduction system, the normal function of the AV node is to 3. Within the intrinsic conduction system, the function of the AV bundle is to 4. Within the intrinsic conduction system, the function of the Purkinje fibers is to 5. A heartbeat involves action potentials from the specialized cells of the intrinsic conduction system spreading to_ 6. In a normal ECG wave tracing, atrial repolarization is hidden by 7. List the components of the intrinsic conduction system in the correct order of depolarizatio 8. Each heartbeat involves both electrical and mechanical events. How are pacemaker cells involved in each of these events?Explanation / Answer
1.Ans- Heart depolarization
Explanation:
The intrinsic conduction system made of autorhythmic cells that helps in initiating and distributing the action potentials in every part of the heart. This system coordinates the activity of the heart by measuring the direction and speed of heart depolarization that causes the contraction of the heart.
2.Ans-
AV nodes function-
- It is present in the inferior interatrial septum that delays the action potential whereas the contraction of atria takes place before transmitted to the AV bundle.
3.Ans-
The function of the AV bundle-
It helps in transmission of action potential from the atria to the ventricles and joins the AV node to the bundle Branches.
4.Ans-
The function of the Purkinje fibers –
It helps in transmission of the action potential to the contractile cells of the ventricle.
Explanation:
For answer 2, 3, and 4
Intrinsic Conduction System consists of
A.SA nodes
B. Internodal pathway
C.AV nodes
D.AV bundle
E. Bundle Branches
F. Purkinje fibers
A. SA Node- It is found in the upper right atrium that initiates the depolarization impulse and produces an action potential that spreads from the atria to the AV node.
B.Internodal Pathway- It is present in the atria walls that join the SA node to the AV node and helps in distributing the action potential to the contractile cells of the atria
C.AV Node- It is present in the inferior interatrial septum that delays the action potential whereas the contraction of atria takes place before transmitted to the AV bundle.
D. AV Bundle- It helps in transmission of action potential from the atria and the ventricles and helps to link the AV node to the bundle Branches.
E.Bundle Branches- It involves to carry the action potential with the help of the interventricular septum to the heart apex.
F. Purkinje Fibers- It helps in transmission of the action potential to the contractile cells of the ventricle.
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