Explain how ion transport in the ascending limb maintains conditions favouring later water reabsorption.
Tę umiejętność sprawdza 7 zadań wzorowanych na arkuszach IB z lat 2022–2026.
Which renal mechanism helps conserve water when the body needs to produce concentrated urine? A. Active pumping of water molecules through aquaporins B. Removal of all solutes from the medulla C. Suppression of every nephron’s filtration for an entire day D.…
(a) Describe how auxin produces a shoot’s directional growth response to light. (b) Outline feedback interactions among hormones controlling ovarian and uterine cycles. (c) Explain how the loop of Henle and ADH influence urine concentration.
A model sample contains 24 mg urea per 100 mL of plasma but 1440 mg per 100 mL of final urine. Explain how the kidney produces this concentration increase.
Which adaptation can help a small desert mammal conserve water? A. A long loop of Henle supporting a strong medullary osmotic gradient B. A collecting duct permanently impermeable to water C. Loss of all ADH secretion during dehydration D. Sweating at a higher…
Water has physiological roles in both plants and mammals. (a) Outline how water’s properties allow evaporation to cool an animal. (b) Describe how weather affects the movement and loss of water in a terrestrial plant. (c) Explain how a dehydrated mammal…
Membrane transport and kidney function contribute to water and solute balance. (a) Outline four different ways substances cross the plasma membrane, giving an example for each. (b) Explain how kidney regions contribute to water balance and excretion of…
State the kidney region into which the loop of Henle extends.
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