Chapters 9-10: Cardiac System 1 Intercalated discs A B C D E represents atrial d

Question

Chapters 9-10: Cardiac System 1 Intercalated discs A B C D E represents atrial depolarization End of systole as SL valves snap shut Diminished ga p junctions delay impulses to ventricles conducts impulses from AV node to the purkinje fibens point that cardiac muscle cells fuse 2 Gap junctions 3 P wave on EKG 4 Second heart sound 5 AV node ium channels F Increases Na+ and Ca++ permeability to increase heart rate 7 AV bundle 8 Norepinephrine 9 sinus nodal fibers 10 Systole G H I J self-excite due to continual sodium leakage period of contraction of the cardiac muscle responsible for the cardiac action potential plateau rapidly conduct action potentials across cardiac muscle fibers indicates time between atria and ventricle excitation indicates time of contration of the ventricle 11 P-R interval 12 Q-T interval L

Explanation / Answer

Cardiac system match the column:

1. J

The intercalated discs contain gap junction which conducts the nerve impulses across cardiac muscle fibres.

2. E

The point that cardiac muscle cells fuse due to contraction in unison.?

3. A

Represents atrial depolarization by its first deflection.

4. B

End of systole as the SL valve snap shut

5. G

Self-excite due to continual sodium leakage due to an increase in systolic concentration ultimately dephosphorylation

6. C

7. K

8. F

9. D

Conducts impulses from AV node to Purkinje fibres via the long fibres embedded in walls of the heart.

10. H

Indicates the period of contraction of the ventricle for the circulation of blood

11. L

12. I

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