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Zorluk: OrtaMorphological and Physiological Adaptations to Environments

Desert mammals such as the kangaroo rat survive in arid habitats with minimal access to free drinking water. Which of the following physiological adaptations primarily enables them to maintain internal water balance under these conditions?

  1. Excreting hypertonic urine via elongated loops of Henle and relying on metabolic water produced from fat oxidationCevap
  2. B
    Excreting large volumes of dilute urine using Malpighian tubules to eliminate metabolic wastes continuously
  3. C
    Acquiring heat tolerance during an individual's lifetime and transmitting this somatic physiological change to its offspring
  4. D
    Utilizing photolysis of water during dark cellular respiration to generate intra-tissue moisture

Cevap

Excreting hypertonic urine via elongated loops of Henle and relying on metabolic water produced from fat oxidation
The correct answer identifies that desert mammals possess nephrons with exceptionally long loops of Henle extending deep into the renal medulla. This structural length generates a high medullary hypertonicity, facilitating maximal reabsorption of water from the collecting ducts to produce concentrated (hypertonic) urine. Additionally, these animals rely heavily on metabolic water generated during the aerobic oxidation of fats.

Adım Adım Çözüm

1
Identify the primary environmental challenge faced by desert mammals
Severe water scarcity requiring mechanisms to minimize water loss and obtain alternative water sources.
Arid environments lack abundant drinking water and present high evaporation rates.
2
Analyze renal physiological mechanisms for water conservation
Mammals with longer loops of Henle in their nephrons create a steeper osmotic gradient in the renal medulla, enabling extreme concentration of urine.
Hypertonic urine minimizes urinary water loss.
3
Analyze metabolic water production
The oxidation of dietary fats yields significant metabolic water (H2OH_2O), supplying necessary cellular hydration.
Aerobic respiration breaks down lipids into carbon dioxide and water.

Anahtar Kavram

Physiological adaptations for water conservation in desert mammals
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Morphological and Physiological Adaptations to Environments

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