The left side of the heart receives oxygenated blood from the lungs and pumps it to the cells and tissues to the body. The blood then returns to the right side of the body this is called systemic circuit. From the heart blood flows through large muscular arteries, then into smaller and smaller arteries, then arterioles and finally to the capillaries. It’s in the capillaries where the diffusion process takes place to exchange molecules of oxygen and nutrients for carbon dioxide of nearby cells, after leaving the capillaries blood is collected into venules the smallest of veins then into veins of increasing size until it reaches the heart [6]. The right side of the heart receives blood returning from the tissues and pumps it towards the lungs,
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The cardiac cycle is divided into two phases called systole and the diastole. The systole is when the heart contracts (the pumping phase) and diastole is when the heart relaxes Figure 3[7] …show more content…
The cardiac cycle begins when the deoxygenated blood from the upper part of the body 7 and the lower body 8 enters into the hearts through the superior vena cava 9 and the inferior vena cava 10, this blood enters the right atrium 11. Now the right atrium contracts pushing the blood into the right ventricle 1 through the tricuspid valve. As the ventricle is filled the tricuspid valve closes to prevent any back flow of the blood. The right ventricle contracts forcing the blood to enter into the pulmonary artery 2 through the pulmonary valve. The pulmonary artery extends into both of the lungs where the deoxygenated blood is replenished with oxygen and is send back to the heart through the pulmonary veins into the left atrium chamber 4 at this time the left and right atrium relax to intake oxygenated and deoxygenated blood respectively. Which is marked as a diastole (term used to describe the relaxation) [9]. Now the oxygenated blood is then send into the next chamber the left ventricle through the mitral valve by the contraction of the left atrium. Next the left ventricle contracts forcing the blood to be pumped out of the heart into the aorta8 through the aortic valve which shuts off close as the blood is pushed out to the aorta. The oxygenated blood then travels to the upper and lower parts of the body through large muscular arteries , then into smaller and smaller arteries , then arterioles and finally to the capillaries. The
The cardiac cycle is divided into two phases called systole and the diastole. The systole is when the heart contracts (the pumping phase) and diastole is when the heart relaxes Figure 3[7] …show more content…
The cardiac cycle begins when the deoxygenated blood from the upper part of the body 7 and the lower body 8 enters into the hearts through the superior vena cava 9 and the inferior vena cava 10, this blood enters the right atrium 11. Now the right atrium contracts pushing the blood into the right ventricle 1 through the tricuspid valve. As the ventricle is filled the tricuspid valve closes to prevent any back flow of the blood. The right ventricle contracts forcing the blood to enter into the pulmonary artery 2 through the pulmonary valve. The pulmonary artery extends into both of the lungs where the deoxygenated blood is replenished with oxygen and is send back to the heart through the pulmonary veins into the left atrium chamber 4 at this time the left and right atrium relax to intake oxygenated and deoxygenated blood respectively. Which is marked as a diastole (term used to describe the relaxation) [9]. Now the oxygenated blood is then send into the next chamber the left ventricle through the mitral valve by the contraction of the left atrium. Next the left ventricle contracts forcing the blood to be pumped out of the heart into the aorta8 through the aortic valve which shuts off close as the blood is pushed out to the aorta. The oxygenated blood then travels to the upper and lower parts of the body through large muscular arteries , then into smaller and smaller arteries , then arterioles and finally to the capillaries. The