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Ch.44 Controlling the Internal Environment I. Thermoregulation II. Osmoregulation III. Excretion.

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Presentation on theme: "Ch.44 Controlling the Internal Environment I. Thermoregulation II. Osmoregulation III. Excretion."— Presentation transcript:

1 Ch.44 Controlling the Internal Environment I. Thermoregulation II. Osmoregulation III. Excretion

2 Thermoregulation Heat exchange review Fig 44.1 Ectothermy example: Endothermy example:

3 Thermoregulation p.871 Feedback mechanisms (Fig 44.8) Hypothalamus control (Ch 48) Responses to high body temp? Responses to low body temp? Acclimatization (some mammalian cell proteins) Torpor (hibernation, estivation)

4 Water Balance & Waste Disposal p. 873 Nitrogenous wastes: Ammonia, urea, uric acid (fig44.10) Osmoregulation: (fig 44.11) Stenohaline, euryhaline Anhydrobiosis (water bears p. 879)

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6 Salt water fish Fresh water fish

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8 Fig 44.18, anatomy terms Excretory Systems p.879

9 What is the function of the kidneys? 1. Filtration NEPHRONS of the kidneys Blood pressure forces blood into the glomerulus; water,urea, small solutes are forced through the filter. Nonselective filtration

10 Excretory Systems in the Nephron Proximal tubule Loop of Henley Distal tubule (collecting duct) 99% of water is reabsorbed back into the body

11 Excretory Systems: in the Nephron Reabsorption Sugar, vitamins, nutrients, water Some salts

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13 Excretory Systems Feedback circuits: ADH, hypothalamus RAAS (renin-angiotensin-aldosterone system) ANF (atrial natriuretic factor)

14 Excretory Systems

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