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Excretory System

Excretory System. Part 1. Excretion . Process that rids body of metabolic wastes: Preformed by: a) Skin b) Liver c) Lungs d) Kidney f) Intestines . a) Skin. Primarily to cool body Perspiration includes: i) water ii) Salt (K + ,Na + ,Ca 2+ ,Mg 2+ ,Fe + ) iii) urea.

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Excretory System

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  1. ExcretorySystem Part 1

  2. Excretion • Process that rids body of metabolic wastes: • Preformed by: a) Skin b) Liver c) Lungs d) Kidney f) Intestines

  3. a) Skin • Primarily to cool body • Perspiration includes: i) water ii) Salt (K+,Na+,Ca2+,Mg2+,Fe+) iii) urea

  4. b) Liver • Excretes: i) bile (breakdown of RBC) ii) urochrome (breakdown of heme) gives yellow color of urine

  5. c) Lungs • Excretes: i) CO2 ii) some H2O

  6. d) Kidneys • Excretes nitrogenous wastes: i) ammonia (NH3) – deamination of amino acid  toxic; therefore converted to urea ii) uric acid - nucleic acid breakdown iii) creatinine – from creatinine phosphate in muscle metabolism

  7. d) Kidneys • Also excretes: i) ions ii) water iii) detoxified drugs (penicillin, histamines) Urine is composed mainly of urea (~3%), salts (~2%), and water (~95%)

  8. e) Intestines • Excretes iron and calcium salts via feces

  9. Major Organs Kidney Renal artery Renal Vein Ureter Bladder Urethra

  10. Functions of major organ • Removal of metabolic waste • Maintain blood volume • Maintain blood pH • Brings blood to kidneys • Brings blood away from kidneys • 25cm tube from kidney to bladder via peristalsis • Hold up to 600mL – 1000 mL of urine • Hollow and muscular • Tube carrying urine out from bladder • ♀ ~1” long (carries urine only) • ♂ ~ 6” long (carries semen and urine)

  11. Adrenal Gland and Kidney Adrenal Cortex - Secretes hormone Aldosterone • Adrenal Medulla • Secretes adrenaline/noradrenalin • Epinephrine/norepinephrine

  12. Kidney Renal Medulla Renal pelvis Renal Pyramid Video

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