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10 Cards in this Set
- Front
- Back
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goal of osmoregulatin
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-maintain homeostasis
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sources of water
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-food
-metabolic water production -sea water |
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drinking seawater
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-increases water in system (unlike humans)
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marine mammal kidneys
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-larger, higher concentrating ability
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lobulate kidney
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-think "bag of grapes"
-group of smaller, interconnected kidneys -greater surface area of medulla -not in sirenians |
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reducing water loss:
cutaneous evaporative water loss |
-sweat glands: prominent in fur seals, reduced in phocids, absent in cetaceans
-presents a challenge in warm climates |
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respiratory evaporative water loss
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-apneustic breathing
-fewer breaths reduces EWL from the lungs -allows greater oxygen acquisition |
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nasal turbinates
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-countercurrent exchange
-large surface area -allows water to be trapped/retained |
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urinary and fecal water loss
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-depends largely on food source
-proteins: CO2, WATER, NITROGEN -carbs and fats CO2, WATER |
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milk composition
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-water content declines
-lipid content increases -protein content is constant |
