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Structure and function of the arteries veins and capillaries
Structure and function of the arteries veins and capillaries
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1. The three differences between arteries and veins are which veins they have few layers of smooth muscles and connective tissue unlike arteries which have many layers of smooth muscle tissues. The difference in the two is also veins have very little elastic as well as a wide lumen and arteries have several layers elastic and a regular lumen. Last but not least veins carry oxygenated poor blood to the heart and arteries carry oxygenated blood away from the heart.
2. Blood pressure, flow and resistance in the body are referred to as the hemodynamic. Certain changes or lack of proper pressure, flow or resistance can cause major problems making proper function critical for survival. Blood viscosity is not always the same, it increases the same way hematocrit does. When there are changes in hematocrit we can see a significant effect on the resistance to the flow in various situations such as in extreme dehydration. When the body does not get enough water it becomes dehydrated, and there is an increase in hematocrit in the blood. The Length is not a factor in the control of resistance, yet the radii of blood vessels do not remain constant. Radius does influence the resistance and the flow of fluids.
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Cruise control for blood flow to the organs blood can’t remove them fast as they are produced. One of the mechanisms comprises the same metabolic fact as active hyperemia .When arterial pressure reduction decreases blood that flows to an organ, the oxygen running to the organ diminishes causes local extracellular oxygen to lower. Also the blood supply may be constant metabolic activity which happens when there is a decrease of blood flow. Some examples of active hyperemia are eating, exercising and bench
The largest component of the blood is the Plasma, a liquid substance made up of 91.5% water and 8.5% solutes that is responsible for over half the blood’s total volume. This liquid portion of the blood is vital for maintaining blood pressure within the body that helps capillary exchange. (Tortura 691-692). Cases of hemorrhagic or hypovolemic shock, a severe reduction in plasma is what triggers the body’s feedback systems, and compensation for fluid loss will stem from pulling of water from other
Egi A, Kawamoto M, Kurita S, Yuge O. Systolic arterial pressure variability reflects circulating blood volume alterations in hemorrhagic shock in rabbits. Shock 2007;28:733-40.
The Mayo Clinic’s book on High Blood Pressure was full of detailed facts about blood pressure and what it is. This is extremely significant to the experiment because blood pressure is one of the variables being tested. Understanding blood pressure is one of the key components to receiving accurate results from this experiment. Most of the book is on high blood pressure, which is not necessary for the experiment, but the book still had plenty of useful information about blood pressure itself. The book explains that when the heart beats, a surge of blood is released from the left ventricle. It also tells of how arteries are blood vessels that move nutrients and oxygenated blood from the heart to the body’s tissues. The aorta, or the largest artery in the heart, is connected to the left ventricle and is the main place for blood to leave the heart as the aorta branches off into many different smaller
In an arterial system, the input impedance of the vessel varies with changes in the vessel’s size and properties. For compliant arteries, whic...
A third difference is that the arteries have high pressure within the blood, this is not the same in the veins though as the blood that they carry into the heart contains lower pressure.
The cardiovascular system - The cardiovascular system is responsible for transporting nutrients and removing gaseous waste from the body. It consists of the heart, which powers the whole process, the veins, arteries, and capillaries, which deliver oxygen to tissue at the cellular level. The cardiovascular system carries blood that is low in oxygen away from the heart to the lungs via arteries, where oxygen levels are restored through the air once oxygenated, this blood is then carried throughout the body via arteries, keeping our organs and tissue alive. The cardiovascular system is the workhorse of the body, continuously moving to push blood to the cells. If this important system ceases its work, the body dies.
Heart Disease. Those two words often conjure images of an elderly man clutching his chest in a fit of pain and subsequently succumbing to a heart attack. Those two words describe the leading cause of death in Americans--nearly 25%1. Unfortunately, many specific heart problems fade away and fall under the umbrella of only two words. This research paper will discuss one of those heart problems, aortic dissection, in much more detail, than just two little words.
The walls of arteries are made up of three layers same as veins. Its inner endothelium is composed of epithelial cells which is very smooth. This layer helps minimise the friction. The tunica media provides strength and elasticity. It contains smooth muscles, collagen and large amount of elastic fibres.
Skin discoloration of the lower legs, ankles and feet may appear if there is increased pressure in the leg veins. The pressure may be the result of venous stasis. This is a condition in which there is poor blood flow from the legs back to the heart. It usually occurs when varicose veins have formed and the blood starts to pool in the veins and becomes stagnant. As it accumulates, small and medium sized veins may spring a tiny leak and some blood passes into the tissue. Once in the tissue, the blood breaks up and iron is released that stains the skin causing it to turn brown.
The male hit in the face with a softball is showing an immediate response to tissue damage that led to the swelling of the eyelids because there are several blood vessels (arteries and veins) surrounding the ocular tissues such as maxillary artery, superficial branch of temporal artery, palpebral artery, and lacrimal artery tend to vasodilate which increase the blood flow resulting in the swelling of the eyelids.1 Increase in pain(dolor), redness(rubor), heat (calor), swelling (tumor), and loss of function can be experienced by the patient. 1
Hypertension can be defined as a force exerted against the wall of blood vessels. However, high blood pressure occurs when there is high pressure at the time of ventricle contraction during the systolic phase against decrease contract during diastolic phase as the ventricles relax and refill. This can be recorded as systolic over diastolic in millimeters of mercury. (Wallymahmed, M. 2008).
The spleen, an organ on the left side of the abdomen across from the liver, is responsible for filtering the blood for infections and other abnormalities. Normal red blood cells can change shape and squeeze through this filter, but sickled cells get stuck and cannot recirculate through the body, so that the number of circulating blood cells goes down. Meanwhile, the bone marrow, where red blood cells are made, pitches in by making more cells. It can't keep up with the destruction, though, so the total number of red blood cells drops to a low level and the body becomes anemic. ("Anemic" is the medical word for having a low number of red blood cells.)
walls of the veins are permeable to H2O at this point, starving the rest of the
The second and more serious type of bleeding is venous bleeding, which transpires when a vein has been severed and blood flows steadily. Most veins collapse when cut, which aids in controlling this type of external bleeding until medical attention can be received.
The arteries supply blood rich in oxygen to the body, the veins direct deoxygenated blood from the capillaries back to the heart. These roles make up the circulatory function. Blood flow through these blood vessels can be disrupted resulting in peripheral vascular diseases. These diseases occur as a result of narrowing or blocking of the blood vessels. The risk factors of peripheral vascular diseases include diabetes, smoking, high level of cholesterol, overweight, high blood pressure etc. these risk factors result to aneurysms, Raynaud’s diseases, Buerger’s disease, renal artery disease etc. With this diseases, the peripheral vascular system should be assessed to enable nurses and other health personnel make good