length of blood vessels is twice the circumference of the equator Arteries carry blood away‚ they branch into arterioles Arterioles are small vessels that convey blood to the capillaries. Capillaries are microscopic vessels with very thin‚ porous walls. Networks of capillaries are called capillary beds Sites of diffusion They converge into venules at the downstream end‚ and venules converge into veins Portal veins are the only veins that carry blood between capillary beds Heart: Atria - chambers
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atria and two ventricles it also has two pairs of valves (atrioventricular valves and the semilunar valves). The arteries‚ arterioles‚ veins and venules have the same tissue layout but different thickness of the tissues is different. It also contains nervous tissue which is under the control of autonomic nervous system controlling whether the heart beat speeds up or slows down. In arteries there is a thicker smooth muscle layer to resist bursting. The blood is made up of plasma a fluid matrix and different
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Laszlo Vass‚ Ed.D. Version 42-0008-01-01 Purpose Please explain the purpose of this lab. Include in your explanation the major concepts you learned and any safety concerns associated with the lab. Purpose is to understand how the veins and arteries run through the body and how they function while the heart beats‚ where they deliver and drain blood to/from and how the cardiovascular system works together. Lock up the dogs while dissecting. wear face mask to protect from smells and splatter
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collects carbon dioxide and enters through the vena cava into the right atrium of the heart. The right ventricle then pumps blood through the pulmonary artery into the lungs. In the lungs‚ tiny blood vessels called capillaries absorb carbon dioxide from the blood and replace it with oxygen. Our oxygenated blood then flows through the pulmonary vein and into the left atrium. Oxygenated blood then pumps through the mitral valve and into the left ventricle. The left side of our heart contracts the
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the blood vessels‚ which allows them to absorb the pressure emitted from the heart with each beat and to return blood back to the heart‚ usually on an uphill course against the constant pull of gravity. Key point: In differentiating between arteries‚ veins‚ and capillaries‚ emphasize that the structure of each type of vessel is related to the differing amounts of pressure they must each absorb from the heart‚ as well as their respective roles in blood
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Circulatory systems Closed circulatory systems: • Blood leaves heart under pressure to arteries then arterioles then capillaries. • Capillaries come in large numbers. They exchange substances between the blood and cells. • After passing through capillaries‚ blood goes back to the heart via veins. • Valves in the veins ensure that blood only flows in one direction. Single circulatory system: • Heart pumps deoxygenated blood. • Gaseous exchange (diffusion of CO2 from blood to H2O and diffusion
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old Caucasian female who had a partial obstruction in the carotid artery on the right side for over two years and had a stroke in the right hemisphere 6 months ago. The main common carotid artery splits into the external carotid artery and the internal carotid artery. The external carotid artery supplies blood to the exterior features outside of the skull‚ primarily the exterior of the face and the neck. The internal carotid artery supplies blood to the interior of the skull‚ including the anterior
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through three types of flexible tubes‚ the blood vessels (Fig. 4.1). The arteries channel blood from the heart to all parts of the body needing service. Once there‚ the blood passes through narrow arteries and enters the capillaries‚ which are the narrowest blood vessels. Many substances and some blood cells pass into and out of the blood by moving through the thin porous capillary walls. The blood is then carried through the veins‚ which return the blood to the heart. The passage of blood through the
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developing chronic diseases such as ischaemic heart disease and BHF (Ketata et al.‚ 2012). The patient presents airway obstruction and possible heart complications. Chronic dyspnea on exertion can be linked to many cardiovascular and respiratory problems. Stretch receptors located in the lung’s bronchioles detect changes in lung expansion which causes irritation by certain chemical stimuli such as tobacco from smoking (Barnes et al‚ 2014). As a result‚ this change increases shortness of breath. As he experiences
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vessels and structure There are three types of blood vessel‚ Arteries ‚ veins and capillaries. Each of them have different functions involved in carrying blood around the body . Arteries are blood vessels that transport blood away from the heart‚ veins are blood vessels that transport blood to the heart and Capillaries are extremely small vessels located within the tissues of the body that transport blood from the arteries to the veins. they must be constructed for carrying fluids over long distances
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