Path Of A Red Blood Heart

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Identify or trace the path of a red blood cell through all anatomical/structural areas of the heart.
• The red blood cell carrying oxygen is pushed into the aorta through the aortic valve by contraction of the left ventricle (Marieb, Mitchell, Smith, 2013, pg. 446).
• From the aorta, the red blood cell travels into one of the arteries from the arterioles then will hit the capillaries (Marieb, Mitchell, Smith, 2013, pg. 446).
• Within the capillary, the oxygen molecule that is taken by the red blood cell detaches and then passes through the capillary into the body tissues (Marieb, Mitchell, Smith, 2013, pg. 446).
• The deoxygenated red blood cell will then travel through the venules, veins. Then it will return to the right atrium of the heart.
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Then the cycle will repeat from the beginning (Marieb, Mitchell, Smith, 2013, pg. 446).
Identify and briefly describe the components of the intrinsic conduction system in the transmission of the impulse in the heart.
Intrinsic Conduction System / Nodal System:
It is made up of myocardial cells that don’t contract and that are able to produce and distribute electrical impulses within the heart. The Intrinsic conduction system coordinates the heart’s activity and then makes the heart beat synchronized (Marieb, Mitchell, Smith, 2013, pg. 458).
The main components:
• SA Node
• Internodal
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Sinoatrial Node (SA):
The location is the posterior wall of the right atrium. It is start of the depolarization impulse that produces an action potential that goes to the atria then to the AV node, and the cardiac pacemaker. It’s what gives the heart the pace of the beat (Marieb, Mitchell, Smith, 2013, pg. 458).
Internodal Pathway
The location is the atria which links the SA node to the AV node. It gives off the action potential to the contractile cells of the atria (Marieb, Mitchell, Smith, 2013, pg. 458).
AV Node
The location is the inferior area of the interatrial septum, which is immediately above the tricuspid valve (Marieb, Mitchell, Smith, 2013, pg. 458).
The action potential slowed down at the AV node, as the atria contracts. This happens right before exited to the AV bundle. The delay happens because of a small diameter of fibers that have very little amount of gap junctions (Marieb, Mitchell, Smith, 2013, pg. 458).
AV Bundle, Bundle of His
The only electrical connection between the atria and the ventricle. It allows the action potential to move from the interatrial septum to the interventricular septum, connecting the AV node to the Bundle Branches (Marieb, Mitchell, Smith, 2013, pg.

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