Arteries
When the blood is pumped from the heart, it travels the arteries first. In the right ventricle, blood are pumped to arteries that carries to the lung. In the left ventricle, blood are pumped to aorta, which are branched off to smaller arteries. The first branch carries blood to heart is named coronary arteries. Other branches carries blood to other organs.
Their structure is a three cell layers, which function as thick wall of arteries.
The most inner layer is made up of epithelial cells, which is smooth. This makes blood to freely.
The middle layer is mostly made up of smooth muscle.
The outer layers is made out of connective tissue, which give them flexibility.
This structure helps arteries by giving them flexibility and strength, which can resist on enormous pressure of blood pumped from heart (strength). Also, expand and relax when heart beats (flexibility).
Their structure is a three cell layers, which function as thick wall of arteries.
The most inner layer is made up of epithelial cells, which is smooth. This makes blood to freely.
The middle layer is mostly made up of smooth muscle.
The outer layers is made out of connective tissue, which give them flexibility.
This structure helps arteries by giving them flexibility and strength, which can resist on enormous pressure of blood pumped from heart (strength). Also, expand and relax when heart beats (flexibility).
Pulse is expansion and relaxation of artery wall. This is caused by expansion and relaxation of artery wall. When heart beats, a spurt of blood go to all the arteries. When it travels through arteries, it expands. In opposite if it passes, arteries relax.
The middle layer, the muscle work as a control gate which regulates amounts of blood sent to organs. They adjust the amounts of blood by contracting, which makes opening narrower (less blood to go through) and by relaxing, which makes opening wider (more blood to go through).
The middle layer, the muscle work as a control gate which regulates amounts of blood sent to organs. They adjust the amounts of blood by contracting, which makes opening narrower (less blood to go through) and by relaxing, which makes opening wider (more blood to go through).