The sequence of impulse through the cardiac conduction system starts from SA node passes to AV node to atrioventricular bundle fibers and finally to Purkinje fibers.
Heart is an organ that receives oxygenated blood form lungs and deoxygenated blood from different parts of body. Oxygenated blood is transported to different organs and deoxygenated blood is transported to lungs for oxygenation.
Now, to perform this transportation, the auricles and ventricles of heart contract and relax. In order to contract and relax, impulse generation is required, which begins at SA node or Sinoatrial node. It is also referred to as pacemaker of the heart. SA node contracts the atria and the impulse transfers to AV node or Atrioventricular node.
This is followed by transfer of impulse to atrioventricular bundle fibers which further passes it on to Purkinje fibres for ventricular contraction. Now the blood is sent to lungs and aorta as per it's oxygen status.
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Explanation:
Variations in the sun's energy reaching Earth
Changes in the reflectivity of Earth’s atmosphere and surface
Changes in the greenhouse effect, which affects the amount of heat retained by Earth’s atmosphere
<h2>African Americans </h2>
Explanation:
African Americans were the people left out of the postwar boom
- African Americans and women were entitled to the same benefits as white men under the GI Bill, but often faced difficulty trying to claim their benefits due to discrimination
- Those who did manage to get benefits were often steered towards training for menial jobs
- The frustration of African American veterans barred from participating in the postwar economic boom became a major motivating factor in the Civil Rights Movement
Answer:
Pluto is big enough to be considered a dwarf planet, but it has not been classified as such in some peoples views such as Quaoar and Sedna.
Explanation:
The both reach the otter layers of the solar system just like Pluto and are as I said above big but not big enough to be considered a dwarf planet
