Physiology 206 1STedition Lecture 20 Outline of Last Lecture I Snow day no lecture Outline of Current Lecture I Kidneys Current Lecture These notes represent a detailed interpretation of the professor s lecture GradeBuddy is best used as a supplement to your own notes not as a substitute We have 2 kidneys with an outer capsule o Consist of external cortex and internal medulla o Cortex reddish in color vigorous blood supply o Medulla gray in color sparse blood supply Kidneys get about 25 of blood flow goes into the nephrons Arcuate arteries afferent arterioles glomerular capillaries which are inside the bowman s capsule 80 of nephrons are entirely in cortex cortical nephrons 20 of nephrons are in the cortex except for the loop of Henle Juxtamedullary nephrons next to the medulla 3 processes occur in the nephron o 1 Glomerular filtration Happens in glomerulus o 2 Reabsorption Out of tubular fluid and back in blood stream o 3 Secretion Out of capillaries and into tubular fluid We produce about 1L per day of urine Hydrostatic pressure o Any time there s fluid there s pressure o Pushes fluid out of glomerular capillary
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