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Mammals in Arid Lands

Mammals in Arid Lands. Physiological adaptation for thermoregulation. Counter-current heat exchange Venous blood is cool (evaporation) Arterial blood is warm Carotid artery comes in contact with cool venous blood before going to brain Brain keeps cool.

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Mammals in Arid Lands

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  1. Mammals in Arid Lands

  2. Physiological adaptation for thermoregulation • Counter-current heat exchange • Venous blood is cool (evaporation) • Arterial blood is warm • Carotid artery comes in contact with cool venous blood before going to brain • Brain keeps cool

  3. Physiological adaptations for osmoregulation

  4. Physiological adaptations for osmoregulation • Ability to retain moisture from exhaled air • Air warmed in lungs • Evaporation cools nasal passages • Exhaled air cools and condenses • Reclaim 65-75% of moisture

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