Waec Model Questions Vol1 2020 Biology Question 7

Practice essay / theory question 7 from the 2020 Waec Model Questions Vol1 Biology examination. This question covers homeostasis, endocrine system, negative feedback .

Waec Model Questions Vol1 2020 Biology Essay / Theory

Topics: homeostasis endocrine system negative feedback

Question 7 WAEC_MODEL_QUESTIONS_VOL1 • 2020 • BIOLOGY • essay

Waec Model Questions Vol1 2020 Biology Question 7 diagram

The diagram depicts the pancreas with its endocrine component – the islets of Langerhans – showing the α‑cells that secrete glucagon and the β‑cells that secrete insulin, together with the surrounding blood vessels.

Question Parts

( a )

Describe the negative‑feedback mechanism by which blood glucose concentration is kept within normal limits, referring specifically to the roles of the α‑cells and β‑cells shown in the diagram.

( b )

A defect prevents the β‑cells from releasing insulin. Predict the immediate effect on blood glucose level and discuss two physiological consequences that would arise if the hyperglycaemia persists.

( c )

Explain how the kidney contributes to the homeostasis of blood glucose in the situation described in part (b).

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About This Question

This is Waec Model Questions Vol1 2020 Biology Question 7. It is one of the essay questions from the 2020 Waec Model Questions Vol1 Biology examination.

The question covers homeostasis, endocrine system, negative feedback .

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