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The heart is the muscular pump that pushes blood through the circulatory system. Each heartbeat can be felt as an arterial pulse. The heart valves when closed prevent the blood from leaking back into the heart. Understanding the cardiac cycle in reference to the opening and closing of the heart valves and genesis of the heart sounds is central to appreciating changes in valvular heart disease. The cardiac output is the volume of blood pumped out of the heart during each beat and is expressed as litres/minute. The pressure in the arteries, arterioles and veins is maintained by the vascular tone. This tone is adjusted through autonomic impulses from the vasomotor centre in the medulla. The centre is influenced by afferent impulses from many areas like the carotid body, aortic arch and chemoreceptors
Define cause of vitamin a deficiency - Poverty and ignorance? Low purchasing power of the communities and their consequent inability to meet the nutrient requirements and tradi
What is Bilateral Symmetry system? To review: all animals besides the sponges (Phylum Porifera) belong to the Eumetazoa. There are two groups within the Eumetazoa that possess
Explain about the Anti Obesity Drugs? The anti-obesity drugs can be classified into two broad groups as indicated in the Figure. Drugs must be taken only under Doctor's
Kinds of Hermaphroditism Depending upon the timing of maturity of the gonads, hermaphroditism can be of two types 1. Simultaneous hermaphroditism . Both male and female g
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Why do biologists believe humans, chimpanzees, and gorillas all came from an ancient ancestor
How life exist in earth?
Explain Human Development? Human development begins with fertilization, and continues throughout life. Fertilization occurs when two sex cells, a sperm cell and an egg cell, jo
Applications : The first operation conducted was ligation of a patent ductus arteriosus through a left thoracotomy. Same approach is used for repair of coarctation of the aorta,
Who is known as Father of English Botany? William Turner (1515-1568), whose 'A New Herbal' printed in English appeared in 1551 (first part), 1562 (second part) and 1568 (third
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