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VTNE Ch1 P2
Excretory System- Mosby's Comprehension review 3ed
Question | Answer |
---|---|
Anatomy of Excretory System | Kidneys, Ureters, Urethra, |
Kidneys | Extract and remove metabolic waste from the blood; blood pressure provides the force |
Right Kidney | For firmly attached, and cranially to the left Kidney |
Shape | Vary by species- but usually bean shaped |
Nephron | Microscopic unit of the Kidney |
Outer Cortex of Kidney | contains: glomerulus, Bowman's capsule, proximal convoluted tubules, and distal convoluted tubules |
Kidney: Medulla | Contains Loop of Henle and most of collecting tubules |
Kidney: Medulla arrangement | Arranged into various numbers of pyramids. Apex of pyramid is the papilla, which opens into the minor calyx, major calyx and renal pelvis |
Ureters | Consists of Smooth Muscle Capable of peristalsis to move urine to the urinary bladder |
Urinary Bladder | Consists of Smooth Muscle Lined with transitional cell epithelium |
Urethra | Tube of smooth muscle to transport urine from the urinary bladder to the exterior |
Three phases of urine production | Filtration Reabsorption Secretion |
Urine Production: Filtration | Blood enters glomerulus by the afferent arteriole. Various pressure causes water, salt and small molecules to move out of the glomerulus into Bowman's Capsule |
Filtration at the Bowman's Capsule | Now called the Glomerular Filtrate; rate at which it is formed is called the Glomerular Filtration Rate (GFR) |
Urine Production: Reabsorption | Occurs in the PCT's and loop of Henle, substances needed by the body are reabsorbed from the glomerular filtrate into the peritubular capillaries |
Urine Production: Secretion | Substances are selectivly secreted from peritubular capillaries into the DCT |
Urination (Micturition) | Filtrate flows into collecting ducts, renal pelvis, ureter, urinary bladder, and urethra and is voided as urine |
Hormonal Influence | Antidiuretic Hormone (ADH [Vasopressin]) Increase in ADH release = increase of reabsorbtion of H2O w/in kidney Alderstone- Stimulates Na+ reabsorbtion in the kidneys |