The systemic blood pressure begins from the contraction of the heart and forces the blood to come out of the heart and goes into the blood vessels. There are two mechanisms that happen inside the heart i.e. diastole and systole. The relaxation of the heart chamber is known as the diastole, and the contraction of the heart chamber is called systole.
Through this mechanism the blood pressure takes place. The blood pressure is a significant sign, at the time of the heartbeat the blood pressure differs maximum and minimum pressure known as systolic and diastolic respectively. Normal blood pressure should remain around 120/80.
When a difference in the blood pressure is in charge of the blood flow from one place to another during the circulation. The mean blood flow depends relies upon the resistance of the flow that existed by the blood vessels. Through the hydrostatic force, gravity affects the blood pressure i.e. during standing.
From the ascending aorta, the coronary arteries have been extended. The left common carotid, brachiocephalic, and from the aortic arch, the left subclavian arteries have been extended. Blood is supplied by the assistance of internal carotid and vertebral arteries. The blood supply for the upper extremity is provided by the subclavian arteries. From the abdominal aorta branches of celiac, inferior mesenteric arteries, suprarenal, superior mesenteric, gonadal, and renal has been extended to supply blood towards the abdominal viscera. For muscles and spinal cord blood comes from the lumbar arteries. The lower extremity gets the blood supply from the external iliac artery. Blood circulation to the pelvic viscera is done by the internal iliac artery. The systemic arteries have been extended directly or indirectly from the aorta. The aorta extends from the left ventricle, bends posteriorly towards left, and then inclined towards the abdomen and thorax. The aorta has been divided into three fragments i.e. descending aorta, aortic arch, and ascending aorta. Again, the descending aorta is classified into two categories abdominal aorta and thoracic aorta. Once the oxygen is delivered to the tissues, carbon dioxide is taken away by the veins to the heart. The capillaries fused into the venules where the gaseous exchange happens and these merged and form the larger veins till the blood is delivered into superior vena cava or inferior vena cava they deliver out in the right atrium.
The pressure of the blood present in the arterial blood is greatly dissolute once the blood enters the capillaries. Capillaries are the small vessels having a diameter half of the red blood cells. Though the diameter of a capillary is very small, the total number of the capillary that supplies blood to the arteriole is the total cross-sectional area accessible for the flow of blood raises. Hence, the pressure of the blood when it enters the capillaries reduces. As soon as the blood exits the capillaries and enters inside the venules and veins, less pressure exists to force it along. Blood present in the vein below the heart is assisted back up to the heart by the muscle pump. This happens with the squeezing effect of the contracting muscles on the veins running through it. Within the veins, one-way flow is achieved by the valves.
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