Explanation of how blood returns to the right atrium.
During the systemic (body) circuit where the aorta pumps oxygenated blood to the
body, it also pumps blood through the inferior vena cava to the superior, then back into
the right atrium.
Cooling down is done in order for the body to have a smooth transition from the
vigorous exercise to a steady state by slowing bringing the heart rate down and keeping
the blood flowing.
the location of the heart in the thoracic cavity. The heart is about the size of your fist and is located sub-sternal, center thoracic,
superior to the