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Meghna Thapar 5 years, 6 months ago
Coronary circulation is the circulation of blood in the blood vessels that supply the heart muscle (myocardium). Coronary arteries supply oxygenated blood to the heart muscle, and cardiac veins drain away the blood once it has been deoxygenated. From the tissue capillaries, the deoxygenated blood returns through a system of veins to the right atrium of the heart. The coronary arteries are the only vessels that branch from the ascending aorta. The brachiocephalic, left common carotid, and left subclavian arteries branch from the aortic arch.
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Meghna Thapar 5 years, 6 months ago
The portal venous system refers to the vessels involved in the drainage of the capillary beds of the GI tract and spleen into the capillary bed of the liver. Blood flow to the liver is unique in that it receives both oxygenated and deoxygenated blood. In carrying venous blood from the gastrointestinal tract to the liver, the portal vein accomplishes two tasks: it supplies the liver with metabolic substrates and it ensures that substances ingested are first processed by the liver before reaching the systemic circulation.
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In cockroach, the Malpighian tubules absorb nitrogenous waste products from the haemolymph and convert them into uric acid for excretion.
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Pranav Gupta 6 years, 7 months ago
it is a quantity which is described only by its magnitude. it is always positive. sometimes it is negative but it shows that the magnitude is less.(for eg. temperature). its negative sign does not describes the opposite direction unlike vector.
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Aahana Verma 6 years, 7 months ago
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