For example, the brachiocephalic artery carries blood into the brachial arm and cephalic head regions. One of its branches, the subclavian artery, runs under the clavicle; hence the name subclavian. The subclavian artery runs into the axillary region where it becomes known as the axillary artery. Arteries are blood vessels that carry blood away from the heart. The pulmonary trunk and arteries of the pulmonary circulation loop provide an exception to this rule — these arteries carry deoxygenated blood from the heart to the lungs to be oxygenated.
Arteries face high levels of blood pressure as they carry blood being pushed from the heart under great force. To withstand this pressure, the walls of the arteries are thicker, more elastic, and more muscular than those of other vessels. The largest arteries of the body contain a high percentage of elastic tissue that allows them to stretch and accommodate the pressure of the heart.
Smaller arteries are more muscular in the structure of their walls. The smooth muscles of the arterial walls of these smaller arteries contract or expand to regulate the flow of blood through their lumen. In this way, the body controls how much blood flows to different parts of the body under varying circumstances. The regulation of blood flow also affects blood pressure, as smaller arteries give blood less area to flow through and therefore increases the pressure of the blood on arterial walls.
Arterioles are narrower arteries that branch off from the ends of arteries and carry blood to capillaries. They face much lower blood pressures than arteries due to their greater number, decreased blood volume, and distance from the direct pressure of the heart.
Thus arteriole walls are much thinner than those of arteries. Arterioles, like arteries, are able to use smooth muscle to control their aperture and regulate blood flow and blood pressure.
Capillaries are the smallest and thinnest of the blood vessels in the body and also the most common. Capillaries connect to arterioles on one end and venules on the other. Capillaries carry blood very close to the cells of the tissues of the body in order to exchange gases, nutrients, and waste products.
The walls of capillaries consist of only a thin layer of endothelium so that there is the minimum amount of structure possible between the blood and the tissues.
The endothelium acts as a filter to keep blood cells inside of the vessels while allowing liquids, dissolved gases, and other chemicals to diffuse along their concentration gradients into or out of tissues. Precapillary sphincters are bands of smooth muscle found at the arteriole ends of capillaries. These sphincters regulate blood flow into the capillaries.
Since there is a limited supply of blood, and not all tissues have the same energy and oxygen requirements, the precapillary sphincters reduce blood flow to inactive tissues and allow free flow into active tissues. Veins are the large return vessels of the body and act as the blood return counterparts of arteries.
This lack of pressure allows the walls of veins to be much thinner, less elastic, and less muscular than the walls of arteries. Veins rely on gravity, inertia, and the force of skeletal muscle contractions to help push blood back to the heart.
To facilitate the movement of blood, some veins contain many one-way valves that prevent blood from flowing away from the heart. As skeletal muscles in the body contract, they squeeze nearby veins and push blood through valves closer to the heart.
When the muscle relaxes, the valve traps the blood until another contraction pushes the blood closer to the heart. Venules are similar to arterioles as they are small vessels that connect capillaries, but unlike arterioles, venules connect to veins instead of arteries.
Venules pick up blood from many capillaries and deposit it into larger veins for transport back to the heart. Male grooming is a growth sector over the past 5 years, and continues to be so.
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Health and health care involves not just a simple supplement or product. It takes understanding what the natural system demands of us and what our bodies actually are dealing with from day to day. Our environment has been severely damaged by unnatural practices… land polluted with chemicals and diminished in nutrients, foods altered with chemicals and picked long before being nutritionally complete. Infective agents run rampant throughout our society, causing subclinical infections which produce toxins which slowly rob health and cause premature degenerative changes.
Thank you for the gift of your time, and all the valuable information today. I will be sharing it, slowly but surely. Nothing is greater than the gift of health, and so sad our politicians do not realize that it does not come from universal health care card…..
It comes from companies like yours. I just wanted to let you know that My acid reflux and all of the accompanying symptoms are GONE because of the kind and generous free online advise that you gave about the jumping technique. I emailed you about 2 months ago if you recall. I also advised my nephew to do the same and it has helped him as well. It has gone a long way towards health!! Peace and Blessings to you, your staff, family and friends. I did not get as sick as usual.
It lasted about the normal length of time, but I was so much less sick. I hope I can find things which might even rid me of this. Thanks for this information.