1 / 8

Urinary System

Urinary System. Honors Anatomy & Physiology. Kidneys. Filter 200L of fluid from blood excreting waste as urine Regulate blood volume, balance water & salts, pH Secretes renin (BP) & erythropoeitin (EPO) Renal Cortex – superficial (light)

haamid
Download Presentation

Urinary System

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript


  1. Urinary System Honors Anatomy & Physiology

  2. Kidneys • Filter 200L of fluid from blood excreting waste as urine • Regulate blood volume, balance water & salts, pH • Secretes renin (BP) & erythropoeitin (EPO) • Renal Cortex – superficial (light) • Renal Medulla – deeper (dark) arranged in (8) pyramids • Calyces collect urine & empty into renal pelvis

  3. Nephrons • Functional units of kidney • > 1 million per kidney • Glomerulus capillary bed • Fed & drained by arterioles • High pressure forces fluid & soluted out of blood • Peritubular capillaries • From efferent arterioles of glomerulus • Low pressure reclaims solutes & water

  4. Urine • Color • Yellow due to urochrome (pigment from Hb) • Transparent – • cloudy indicator of UTI • Odor • If left out smells of ammonia from bacteria metabolizing urea (diabetics urine smells fruity) • Average pH6 vary (4.5-8) dependent on diet • Composition • 95% water • Urea (from breakdown of amino acids) • Uric acid (from breakdown of nucleic acids) • Creatinine (from creatine phosphate) • Na+, K+, PO43-, SO42-, Ca2+ Mg+2 ,HCO3-

  5. Ureters • Slender tubes propels urine from kidney to bladder • 3 layer wall, transitional epithelium & 2 sheets of smooth muscle for peristalsis

  6. Urinary Bladder • Collapsable muscular sac temporariliy stores urine • Trigone – 3 openings • 3 layers: transitional epithelium, intermingled smooth muscle, fiberous adventitia • Rugae – folds when empty • Full bladder – 5” long – holds 1 pint of urine (max 1L)

  7. Urethra • Drains urine from bladder • Internal urethral sphincter – involuntary • External urethral sphincter – voluntary • Females 3-4” long, external urethral orifice • Males 8” long, carries urine & semen • 3 regions: • prostetic urethra 1” (within prostate) • Membranous urethra 2cm • Spongy urethra 15cm long

  8. Fluid, Electrolyte, & Acid-Base Balance • Water: women 50% of mass, men 60%, infants 73% • Intracellular fluid – in cells • Extracellular fluid – plasma & interstitial fluid (lymph, CSF, eye humors, synovial fluid, etc) • Water intake 2.5L/day & metabolic water • Water output: lung vapors, perspiration, feces, urine • Solutes • Nonelectrolytes – organic molecules w/covalent bonds • Electrolytes – dissociate into ions in water • Ph 7.35 (viens) - 7.45 (arteries) • Buffers: bicarbonate, phosphate, protein

More Related