BIOM 2000 Lecture Notes - Lecture 7: Distal Convoluted Tubule, Proximal Tubule, Internal Urethral Orifice
20 Mar 2017
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Document Summary
Located against the dorsal body wall in a retroperitoneal position (why if kidney infection you might experience lower back pain) Connects the kidney to the bladder use peristalsis (muscular force) to move urine down the tube and into the bladder. Smooth muscle is able to stretch without being triggered to contract = bladder can ll up without the sensation of needing to pee. When bladder needs to be emptied, stretch sensors will be activated. Contains urethral sphincters = prevent loss of urine: internal sphincter. Relaxed by re ex impulses from the spinal cord: external sphincter. Are the basic structural and functional units of the urinary system. Is a microscopic convoluted blind-ended tube that drains through a renal pyramid. Two types based on location in kidney: cortical nephrons. Account for the majority of nephrons (85%: juxtamedullary nephrons. Located at the boundary of the cortex and medulla. Wrapped around glomerulus = a small capillary bed.
