BIOM 3200 Chapter Notes - Chapter 17: Internal Sphincter Muscle Of Urethra, Urethral Sphincters, Detrusor Urinae Muscle
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11 Jun 2016
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Primary function of the kidneys is regulation of the extracellular fluid. This is accomplished through the formation of urine, which is a modified filtrate of plasma. The paired kidneys lie on either side of the vertebral column. Urine produced in the kidneys is drained into a cavity known as the renal pelvis. The outer cortex is reddish brown and granular in appearance because of its many capillaries. The deeper region, or medulla, is striped in appearance due to the presence of microscopic tubules and blood vessels. The medulla is composed of 8 to 15 conical renal pyramids separated by renal columns. The ureter undergoes peristalsis, wavelike contractions similar to those that occur in the digestive tract. The urinary bladder is a storage sac for urine, and its shape is determined by the amount of urine it contains. The urinary bladder is drained inferiorly by the tubular urethra. The urinary bladder has a muscular wall known as the detrusor muscle.
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