Physiology 3120 Lecture Notes - Renal Corpuscle, Renal Pelvis, Renal Artery

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indigoweasel955

26 Nov 2011

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Renal physiology: functions of the kidneys, regulation of extracellular fluid volume & blood pressure (i. e. maintains homeostasis, regulation of osmolarity (290-300 mos/l, maintain ion balance, ph maintained. Important for enzyme function: excretion of waste (i. e. urine) Creatinin organic waste from muscles: production of hormones (erythropoeotin stimulates production of rbcs, gluconeogenesis (i. e. formation of glucose from other forms, anatomy of the kidney. Located just beneath the sternum at the back of the body. Urine collected in the calyces from the medulla. Calyces collect into the renal pelvis, which then filters down through the ureter into the bladder: anatomy of the nephron. About 1 million nephrons per kidney (we only need about 250k, so have a huge reserve. 80% located in the cortex layer; the other 20% are juxtamedullary nephrons (dip into the capacity) medulla) Cortical: renal corpuscle in upper- to mid-portion of cortex, shorter loop of henle, after the efferent arteriole, blood supply called peritubular capillaries.

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In research in cardiology and exercise physiology, it is often important to know the mass of blood pumped by a person's brain in one stroke. This information can be obtained by means of a ballistocardiograph. The instrument works as follows: The subject lies on a horizontal pallet floating on a film of air. Friction on a pallet is negligible. Initially, the momentum of the system is zero. When the heart beats, it expels a mass m of blood into the aorta with speed v, and the body and platform move in the opposite direction with speed V. The speed of the blood can be determined independently (e.g., by observing an ultrasound Doppler shift). Assume that the blood's speed is 50.0 cm/s in one typical trial. The mass of the subject plus the pallet is 54.0 kg. The pallet moves at a speed of in 0.160 s after one heartbeat. Calculate the mass of the blood that leaves the heart. Assume that the mass of blood is negligible compared with the total mass of the person. This simplified example illustrates the principle of ballistocardiography, but in practice, a more sophisticated model of heart function is used.

lemondinosaur475

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Have you ever thought about why would thrilling rides getyou excited, make your heart racing orsometimes even make you start screaming from the depths of yourcore, forming a bead of sweat on your forehead?

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Physiology 3120 Lecture Notes - Renal Corpuscle, Renal Pelvis, Renal Artery

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