In mammals, blood glucose concentration is maintained around a set point so that the mammal can function efficiently. This is an example of homeostasis. Name the mechanism that maintains blood glucose concentration around a set point. ..........................................................................................................................................

Biology

IGCSE&ALevel

CAIE

Exam No：9700_s24_qp_42 Year：2024 Question No：10(a)

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14.2.1 explain that stomata respond to changes in environmental conditions by opening and closing and that regulation of stomatal aperture balances the need for carbon dioxide uptake by diffusion with the need to minimise water loss by transpiration

14.2.2 explain that stomata have daily rhythms of opening and closing

14.2.3 describe the structure and function of guard cells and explain the mechanism by which they open and close stomata

14.2.4 describe the role of abscisic acid in the closure of stomata during times of water stress, including the role of calcium ions as a second messenger

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