Igcse Model Questions Vol1 2023 Biology Question 8

Practice essay / theory question 8 from the 2023 Igcse Model Questions Vol1 Biology examination. This question covers Coordination .

Igcse Model Questions Vol1 2023 Biology Essay / Theory

Topic: Coordination

Question 8 IGCSE_MODEL_QUESTIONS_VOL1 • 2023 • BIOLOGY • essay

Coordination in animals involves the integration of the nervous and endocrine systems to produce appropriate responses to internal and external stimuli.

Question Parts

( a )

Describe the structure of a typical reflex arc, naming each component and its function, and explain how the speed of the response is achieved.

( b )

Outline the pathway of a hormonal signal that regulates water balance, using antidiuretic hormone (ADH) as an example. Include the role of the hypothalamus and the posterior pituitary.

( c )

A drug blocks the action of acetylcholine at neuromuscular junctions. Predict the effect of this drug on (i) a skeletal‑muscle reflex and (ii) the heart rate. Justify your answers by referring to the relevant aspects of nervous and endocrine coordination.

( d )

Evaluate the advantages and disadvantages of having both nervous and endocrine systems for coordination in the human body.

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About This Question

This is Igcse Model Questions Vol1 2023 Biology Question 8. It is one of the essay questions from the 2023 Igcse Model Questions Vol1 Biology examination.

The question covers Coordination .

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