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Excretion – The process by which metabolic wastes are eliminated Excretory Organs : Skin

Excretion – The process by which metabolic wastes are eliminated Excretory Organs : Skin Lungs Kidneys. Roles of the Kidneys : maintaining blood pH removing waste products from the blood regulating water content of the blood controlling blood volume.

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Excretion – The process by which metabolic wastes are eliminated Excretory Organs : Skin

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  1. Excretion – The process by which metabolic wastes are eliminated Excretory Organs: Skin Lungs Kidneys

  2. Roles of the Kidneys: • maintaining blood pH • removing waste products from the • blood • regulating water content of the blood • controlling blood volume

  3. Nephrons are the functioning units of the kidneys. A ball of capillaries called the glomerulus is surrounded by a structure called Bowman’s capsule. Filtration occurs as blood pressure forces fluid from the blood in the glomerulus into Bowman’s capsule.

  4. The filtrate contains water, urea, salts, amino acids, and vitamins. Reabsorption (at Bowman’s Capsule) -materials that are reabsorbed include amino acids, fats, water, and glucose

  5. The Loop of Henle reabsorbs water in • the descending loop and NaCl enters the interstitial fluid in the ascending • loop. • Urine flows into the collecting duct • and includes salts, water, and urea, • produced by the liver.

  6. Kidney Structure inside collecting ducts lead to the: outside

  7. Nephron Structure

  8. Figure 44.21 The human excretory system at four size scales

  9. The nephron and collecting duct: regional functions of the transport epithelium reabsorbed NaCl conc increases

  10. Human Endocrine Glands The adrenal glands secrete ADH which promotes reabsorption of Na+ and excretion of K+ in the kidneys.

  11. Excretory System Animations: Intro to the Nephron: http://www.biologyalive.com/life/classes/apbiology/documents/Unit%204/45_Lectures_PPT/media/44_13NephronIntroduction_A.swf Bowman’s Capsule: http://www.biologyalive.com/life/classes/anatandphys/documents/Unit%2014/media/44_14aBowmansCapsule_A.swf Loop of Henle: http://www.biologyalive.com/life/classes/anatandphys/documents/Unit%2014/media/44_14bLoopOfHenle_A.swf Collecting Duct: http://www.biologyalive.com/life/classes/anatandphys/documents/Unit%2014/media/44_14cCollectingDuct_A.swf Effect of ADH: http://www.biologyalive.com/life/classes/apbiology/documents/Unit%204/45_Lectures_PPT/media/44_16aEffectOfADH_A.swf

  12. Excretory System Animations: http://www.sumanasinc.com/webcontent/animations/content/kidney.html Bozeman Science: https://www.youtube.com/watch?v=H2VkW9L5QSU https://laughingsquid.com/a-ted-ed-animation-explaining-how-the-human-kidneys-work/

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