The veins supply the deoxygenated blood from the body to the right side of heart. Then the heart pumps it back to the lungs, where it absorbs more oxygen. Then the oxygen contained blood returns to the left side of your heart and then it pumps it out to the res... ... middle of paper ... ...ave large diameter to give least flow resistance. It has valves to prevent low pressure blood flowing backwards. Circulation of blood There are two types of circulatory systems which are pulmonary and systemic.
The human heart acts a pump and it contains four chambers: two atria, which receive venous blood, and two ventricles, which pump blood into the arterial system. Arteries carry blood away from the heart and veins carry blood to the heart. Atria are the upper chambers and ventricles are the lower chambers of the heart. The flow of blood is as follows. Blood, with low oxygen and high carbon dioxide content, returns to the right atrium of the heart from the body via the inferior and superior vena cava, which are the largest veins in the body.
The Circulatory System The circulatory system in anatomy and physiology is the course taken by the blood through the arteries, capillaries, and veins and back to the heart. In humans and the higher vertebrates, the heart is made up of four chambers the right and left auricles, or atria, and the right and left ventricles. The right side of the heart pumps oxygen-poor blood from the cells of the body back to the lungs for new oxygen; the left side of the heart receives blood rich in oxygen from the lungs and pumps it through the arteries to the various parts of the body. Circulation begins early in fetal life. It is estimated that a given portion of the blood completes its course of circulation in approximately 30 seconds.
The largest artery is the aorta, carrying blood to the rest of the body from the left ventricle. Arteries become arterioles, which eventually break up into a number of minute vessels called capillaries. Capillaries have thin walls and are the exchange point between blood and surrounding tissues. They have are also narrow, slowing the blood down to allow time for the diffusion of oxygen, vitamins, minerals, water and amino acid to cross through the cells that line the capillary into the tissue and carbon dioxide and other waste to leave the tissues into the blood. Veins carry blood from the capillaries to the heart.
Systemic circuits take the oxygenated blood from the lungs to the heart. The blood travels back into the pulmonary arteries. From there the blood moves from the arteries to the left ventricle and left atrium. The blood then goes out of the aorta through the systemic veins. When it gets to the systemic capillary beds it drops off the oxygenated to the rest of the body tissues.
The left atrium pumps the blood into the left ventricle. The blood leaves here through the aorta to be distributed to the rest of the body. From here the blood looses its oxygen because it is used for other bodily functions. The cycle then takes place all over again. Blood vessels ============= Arteries- These carry blood at high pressure away from the heart; these are the thickest blood vessels.
Most of the resistance to blood flow in the circulation occurs in the small-diameter arteries called arterioles. These arterioles are especially important in the immediate regulation of blood pressure. Generally, a change in any factor that may cause the blood pressure to rise is balanced by a change in another factor. This is how the body keeps blood pressure in a normal range. The purpose of this lab is to identify the difference between blood pressure and heart rate, and to analyze the factors that may affect
These sounds are results of vibration caused by closure of these valves. Other sounds known as "heart murmurs" are sometimes a sign of heart disease. "Murmurs can be produced by blood flowing rapidly in the usual directions through an abnormally narrowed valve" (Vander, Sherman and Luciano, 1985, p.326) and in some cases, as mitral valve prolapse, the individual does not show any symptoms. Q.5 If a glass probe is poked into the pulmonary trunk which chamber will it enter? The glass probe poked into the pulmonary trunk will follow the cycle of blood from the pulmonary artery to the lungs and then through pulmonary veins will enter the left atrium.
When body muscles surrounding veins move, they squeeze the vein and push the blood along. There are valves inside most veins to prevent the blood from flowing backwards. Capillaries are the link between arteries and veins, the capillary wall is only one cell thick to allow easy exchange of substances between the blood and body cells. Blood is the fluid that transports many substances around the body; oxygen, carbon dioxide, hormones, waste, nutrients. There are four main components to blood, these are plasma, erythrocytes (red blood cells), leukocytes (white blood cells) and thrombocytes (platelets).
The aortic valve prevents the oxygenated blood from flowing back into the left ventricle. The aorta branches out to provide oxygenated blood to all parts of the body. The oxygen depleted blood is returned to the heart via the vena cava. Atrial systole Ventricular systole Ventricular Diastole