A&P II Notes April 26

A&P II Notes April 26 - Anatomy& Physiology II...

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Unformatted text preview: Anatomy & Physiology II Notes – 4/26/07 Kidney Function • Kidneys – part of the urinary system, main job is to filter and cleanse blood – cleanses it of nitrogenous waste products, excess salt and water (important in BP and blood volume regulation), waste products of metabolism (hydrogen ions), produce vitamin D (last step of synthesis takes place in kidneys), produce erythropoietin (hormone that stimulates bone marrow cells to produce more RBCs), final product is urine (filtrate from blood) o Outer portion of kidney = cortex o Innermost part = medulla Interstitial space has a much higher salt concentration that in the cortex – important because of the capacity to concentrate urine (make it of a smaller volume than what actually gets filtered) o Renal pelvis – in kidneys right before the ureter • Nephrons – structural and functional units of the kidneys, close to 1 million per kidney – we can live with about 1 million total (why you only need one kidney), reduction in the number of functioning nephrons with age o Structure – consists of a tubular component and a vascular (w/ blood vessels) component Tubular • Bowman’s capsule – where the filtration process occurs, leads to the: • Proximal convoluted tubule – gives way to:...
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A&P II Notes April 26 - Anatomy& Physiology II...

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