Ch.44 Controlling the Internal Environment

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Presentation transcript:

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

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

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)

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

Salt water fish Fresh water fish

Excretory Systems p.879 Fig 44.18, anatomy terms

Excretory Systems p.879 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

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

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

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

Excretory Systems

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