In a basic sense, how does a muscle move?
In simple terms; In order for a muscle to move the target muscle must receive an action potential from a nerve which is innervated into that muscle. When the action potential is received by the target muscle the actin and myosin are triggered through a series of chemical reactions that will cause muscle fibers to move, thereby moving the muscle.
What is the purpose of cholesterol?
Cholesterol is not just something that can end up giving someone a heart attack, but rather it is some thing that is critical to our health and well-being. Cholesterol is found in cells. Most specifically, it is found in the cell membranes. Cholesterol provides structural support to the cells. If we had no cholesterol in our bodies our cells would simply flatten out and they would not be able to function and as a result neither would we.
What is the path that blood will take to get from the left ventricle to the legs? Describe all anatomy that the blood will pass through along the way.
The path that blood takes to get from the left ventricle to the legs is very intriguing. First, from the left ventricle upon ventricular contraction, the blood will exit the left ventricle and through the aortic valve which is a pressure sensitive valve. Once the blood is in the aorta it travels up a couple of centimeters before it takes a sharp turn to pass through the aortic arch. After it's journey past the aortic arch it will then begin descending through the abdominal aorta. After descending for a brief period of time the blood will come to a fork in the road where it will then go to the right and left legs. This is the journey in brief.