Physiology 206 1STedition Lecture 20Outline of Last Lecture I. Snow day, no lectureOutline of Current Lecture I. KidneysCurrent LectureThese 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 capsuleo Consist of external cortex and internal medullao Cortex: reddish in color, vigorous blood supplyo 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 nephrono 1. Glomerular filtration Happens in glomeruluso 2. Reabsorption Out of tubular fluid and back in blood streamo 3. Secretion Out of capillaries and into tubular fluid- We produce about 1L per day of urine- Hydrostatic pressureo Any time there’s fluid there’s pressureo Pushes fluid out of glomerular
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