Essay on circulation of blood
For the blood to get back to the heart, the liver empties the clean blood into the hepatic vein, leading to the inferior vena cava, which pumps blood into the heart’s right atrium.Tit Blood group means the grouping of people whose blood can be mixed without clumping of blood corpuscles. When blood of any two different groups is mixed, agglutination or clotting of blood corpuscles occurs resulting in dangerous consequences and so only blood of the same group is used in blood transfusion.It brings the body’s cells what they need in order to survive – oxygen and nutrients. This is not an example of the work written by our professional essay writers.The blood moves through pulmonary circulation and then continues on through systemic circulation.During respiration, energy is released by oxygen from food.Once the air reaches the lungs, it then moves over the larynx and pharynx (Sellnow, 2006). Flow Pressure gradient is the difference in Pressure from one end of the vessel to the other Mean blood pressure decreases as you move away from the heart Resistance in the Venous system is very small and is thus able to return blood to the heart with ease.This released energy, contracts the heart’s many muscle cells, and the four chambers squeeze blood out into the arteries.... He carried out multiple researches to inspect more about the human circulatory system.- The Heart and Blood Circulation The heart is a four chambered muscular pump around the size of a fist.ery large number of blood cells called corpuscles (40%).
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- While humans, as well as other vertebrates, have a closed circulatory system meaning that blood never leaves the network of arteries, veins, and capillaries.
- Read this full essay on The Heart and Blood Circulation. The Heart and Blood Circulation The heart is a four chambered muscular pump aroun.
- The pulmonary circulation is the portion of the circulatory system which carries deoxygenated blood away from the right ventricle of the heart, to the lungs, and.
and the lungs, as distinguished from the systemic circulation between the heart and all other body tissues.When a heart contracts and forces blood into the blood vessels, there is a certain path that the blood follows through the body.The pulmonary circuit passes already-used, deoxygenated and carbon dioxide-rich blood from the heart to the lungs in order for that the blood to become oxygenized. Pressure: BP= blood pressure, CHP = capillary hydrostatic pressure – P in capillary beds (35-18 mm Hg), Venous pressure – P in venous system; very low, venule to right atrium is 18 mm Hg **∆P across entire systemic circuit = ‘Circulatory Pressure’ ~ 100mm Hg, must overcome total ‘Peripheral Resistance’ Arterial network has Highest pressure gradient @ ~65 mm Hg, due to high resistance of arterioles Resistance: Total Peripheral Resistance is due to: Vascular Resistance, Viscosity, & Turbulence Vascular Resistance = resistance of blood vessels; due to friction b/w blood and vessel walls; depends on diameter of vessel: 1Vessel Length, 2Vessel Diameter, 3Viscosity, 4Turbulence (eddies and swirls due to shape irregularities) As arterial branching occurs, the TOTAL cross-sectional area increases and blood pressure falls rapidly; mostly @ small arteries/arterioles Pulmonary vessels are much shorter; thus Pulmonary Circuit has LOWER pressure than Systemic Circuit Arterial Blood Pressure – systolic = peak, diastolic = minimium e.g; 110/75 ‘Pulse’ – rhythmic pressure oscillation w/ each heartbeat Pulse pressure = difference in systolic & diastolic pressure MAP (mean arterial pressure) = Diastolic P (1/3)(Pulse Pressure) Abnormally High = hyper tension ; above 140/90; (increased load on Left Ventricle) & Abnormally Low = Hypotension Elastic Rebound – push generated as arteries recoil, forcing blood toward capillaries while LV is in Diastole.It is not harmful for an adult person to donate blood.The anterior thoracic wall, the airways and the pulmonary vessels anterior to the root of the lung have been digitally removed in order to visualize the different levels of the pulmonary circulation.The blood is deoxygenated because the cell membranes have absorbed all the oxygen that was available in it.