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Circulatory Loops There are 2 primary circulatory loops in the human body: Pulmonary circulation transports deoxygenated blood from the right side of the heart to the lungswhere the blood picks up oxygen and returns to the left side of the heart.
The pumping chambers of the heart that support the pulmonary circulation loop are the right atrium and right ventricle. Systemic circulation carries highly oxygenated blood from the left side of the heart to all of the tissues of the body with the exception of the heart and lungs.
Systemic circulation removes wastes from body tissues and returns deoxygenated blood to the right side of the heart. The left atrium and left ventricle of the heart are the pumping chambers for the systemic circulation loop. The size of blood vessels corresponds with the amount of blood that passes through the vessel.
All blood vessels contain a hollow area called the lumen through which blood is able to flow.
Around the lumen is the wall of the vessel, which may be thin in the case of capillaries or very thick in the case of arteries. All blood vessels are lined with a thin layer of simple squamous epithelium known as the endothelium that keeps blood cells inside of the blood vessels and prevents clots from forming.
The endothelium lines the entire circulatory system, all the way to the interior of the heart, where it is called the endocardium. There are three major types of blood vessels: Blood vessels are often named after either the region of the body through which they carry blood or for nearby structures.
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 and Arterioles 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.Jonathan Myers. From the Cardiology Division, VA Palo Alto Health Care System, Stanford University, Palo Alto, Calif.
Cardiovascular Endurance is the ability of the heart and lungs to supply oxygen-rich blood to the working muscle tissues and the ability of the muscles to use oxygen to produce energy for movement.
This type of fitness is a health-related component of physical fitness that is brought about by sustained physical activity. A person's ability to deliver oxygen to the working muscles is affected.
Major Symptoms or Signs Suggestive of Cardiovascular and Pulmonary Disease The following signs and symptoms must be interpreted within the clinical context in which they appear since they are not all specific for metabolic, pulmonary, or cardiovascular disease.
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