Waec Model Questions Vol1 2017 Biology Question 7

Practice essay / theory question 7 from the 2017 Waec Model Questions Vol1 Biology examination. This question covers homeostasis .

Waec Model Questions Vol1 2017 Biology Essay / Theory

Topic: homeostasis

Question 7 WAEC_MODEL_QUESTIONS_VOL1 • 2017 • BIOLOGY • essay

Waec Model Questions Vol1 2017 Biology Question 7 diagram

The labelled diagram shows the endocrine regulation of blood glucose concentration in the human body. It includes the pancreas with distinct alpha (α) and beta (β) cells, the liver, skeletal muscle and adipose tissue, and arrows indicating the actions of insulin and glucagon as well as feedback from blood glucose to the pancreas.

Question Parts

( a )

Identify the two hormones shown in the diagram and the specific pancreatic cells that secrete each hormone.

( b )

Explain, with reference to the diagram, how blood glucose concentration is restored to normal after a meal.

( c )

A person has a defect that prevents β‑cells from secreting insulin. Predict the likely effect on blood glucose level and describe two physiological consequences of this condition.

( d )

Describe the components of the feedback loop shown in the diagram and explain why it is classified as a negative feedback mechanism.

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About This Question

This is Waec Model Questions Vol1 2017 Biology Question 7. It is one of the essay questions from the 2017 Waec Model Questions Vol1 Biology examination.

The question covers homeostasis .

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