The human vessel
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Blood flows continuously through your body's blood vessels.
Your heart is the pump that makes it all possible. Reviewed by James Beckerman on November 06, It is intended for general informational purposes only and does not address individual circumstances. It is not a substitute for professional medical advice, diagnosis or treatment and should not be relied on to make decisions about your health. Never ignore professional medical advice in seeking treatment because of something you have read on the WebMD Site. If you think you may have a medical emergency, immediately call your doctor or dial This tool does not provide medical advice.
See additional information. It ranges from a diameter of about 25 millimeters for the aorta to only 8 micrometers in the capillaries. This comes out to about a fold range. It is regulated by vasoconstrictors agents that cause vasoconstriction.
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These include paracrine factors e. Vasodilation is a similar process mediated by antagonistically acting mediators. The most prominent vasodilator is nitric oxide termed endothelium-derived relaxing factor for this reason. The circulatory system uses the channel of blood vessels to deliver blood to all parts of the body.
This is a result of the left and right side of the heart working together to allow blood to flow continuously to the lungs and other parts of the body. Oxygen-poor blood enters the right side of the heart through two large veins. Oxygen-rich blood from the lungs enters through the pulmonary veins on the left side of the heart into the aorta and then reaches the rest of the body.
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The capillaries are responsible for allowing the blood to receive oxygen through tiny air sacs in the lungs. This is also the site where carbon dioxide exits the blood. This all occurs in the lungs where blood is oxygenated. In the arterial system, this is usually around mmHg systolic high pressure wave due to contraction of the heart and 80 mmHg diastolic low pressure wave.
Translation of "human vessel" in Spanish
In contrast, pressures in the venous system are constant and rarely exceed 10 mmHg. Vascular resistance occurs where the vessels away from the heart oppose the flow of blood. Resistance is an accumulation of three different factors: blood viscosity, blood vessel length, and vessel radius.
Blood viscosity is the thickness of the blood and its resistance to flow as a result of the different components of the blood.
Depending on the health of an individual, the blood viscosity can vary i. Vessel length is the total length of the vessel measured as the distance away from the heart. As the total length of the vessel increases, the total resistance as a result of friction will increase. Vessel radius also affects the total resistance as a result of contact with the vessel wall. As the radius of the wall gets smaller, the proportion of the blood making contact with the wall will increase. The greater amount of contact with the wall will increase the total resistance against the blood flow.
Blood vessels play a huge role in virtually every medical condition. Cancer , for example, cannot progress unless the tumor causes angiogenesis formation of new blood vessels to supply the malignant cells' metabolic demand. Atherosclerosis , the formation of lipid lumps atheromas in the blood vessel wall, is the most common cardiovascular disease , the main cause of death in the Western world.
Blood vessel permeability is increased in inflammation. Damage, due to trauma or spontaneously, may lead to hemorrhage due to mechanical damage to the vessel endothelium.
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In contrast, occlusion of the blood vessel by atherosclerotic plaque, by an embolised blood clot or a foreign body leads to downstream ischemia insufficient blood supply and possibly necrosis. Vessel occlusion tends to be a positive feedback system; an occluded vessel creates eddies in the normally laminar flow or plug flow blood currents.
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These eddies create abnormal fluid velocity gradients which push blood elements such as cholesterol or chylomicron bodies to the endothelium. These deposit onto the arterial walls which are already partially occluded and build upon the blockage. The most common disease of the blood vessels is hypertension or high blood pressure. This is caused by an increase in the pressure of the blood flowing through the vessels. Hypertension can lead to more serious conditions such as heart failure and stroke. To prevent these diseases, the most common treatment option is medication as opposed to surgery.
Aspirin helps prevent blood clots and can also help limit inflammation.
Vasculitis is inflammation of the vessel wall, due to autoimmune disease or infection. From Wikipedia, the free encyclopedia. For information about plants, see Vascular plant. See also: Circulatory system. Main article: Vascular resistance. Mr Joseph is also of the opinion that few shipping companies look at the staffing levels that are required on a particular ship on a particular voyage.
Another issue that Mr Joseph notes is the challenges that increasingly digital processes and technologies bring. While this provides some benefit, he believes that the impact this has on those on the ship is not taken into account as much as it should be.
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Furthermore, there is an increasing human-computer interface with seafarers relying on the information given to them via a screen. Mr Joseph explained that when he was a junior officer, he was instructed to simply look out of the window. Today, junior officers are spending more time in front of the monitors and they are building their lifestyle on this. The human being is tasked more and more because of such technologies and often their behaviour can be affected if a technology does not perform as expected. This creates additional pressure and stress on the crew that can result in lower vessel performance.
The human being has to be understood and the impact the technology, both good and bad, must be evaluated. Ultimately, human factors is not just about reducing incidents but is about implementing key human factors principles with a focus on the organisation, job execution and providing necessary support for the individual to optimise performance. This includes motivating seafarers to operate a vessel more efficiently, which will come from building a wider culture that ensures all involved are set up for success. The first thing for an organisation to do is to identify where its human factors perspective is today.