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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
Explain the Results of Coarctation of Aorta? Early hospital death in isolated coarctation is around 2 to 10 per cent. In many reports, mortality for older babies approaches 0.
what is homeostasis and how does it happen
Q. Which is the extraembryonic membrane whose function is to store nitrogen wastes of the embryo? Is this function present in placental mammalian embryos? The allantois is the
Explain some Characteristic Features of Mucor? 1. Stolons characteristics of Rhizopus are absent in Mucor. The aerial mycelium in Mucor consists of branched hyphae, which grow
How do populations of predators and prey vary in predatism? Whenever a predator population enhances at the first moment the prey population tends to decrease. At a second momen
In the preceding block you learnt the Darwinian premise of natural selection based on certain facts and deductions thereof. You would have noticed that one of the foundations for t
Germ layer theory
Q. Type one Diabetes Mellitus? Type 1 DM occurs in children and adolescents (6-14 yrs). In this disease, the body makes little or no insulin. Daily injections of insulin are ne
The probability of an individual in a trihybrid F2 generation showing the dominant phenotype for just two traits?
Q. Find the Modalities in stress testing? In addition to electrocardiographic stress testing, there are various newer modalities that can be very useful in the determination o
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