GAMSAT Section III Biology Questions Part 2

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Biology Questions Part 2

Biology Questions Part 2

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Biology: body systems

Oedema is an excessive accumulation of fluid in tissue spaces or a body cavity. It can have many harmful effects, for example impaired healing.

The diagram below indicates the events that lead to systemic oedema in heart failure.

The following points may also be of use:

Increasing plasma volume increases blood pressure
Transudation is the passing of fluid through pores
ADH is antidiuretic hormone
GFR is glomerular filtration rate

1. Which of the following can be concluded from the diagram?

A. Oedema is produced by our body to counteract the effects of heart failure

B. Oedema is the result of excessive plasma volume that is unable to leave the blood vessels

C. Transudation is involved in a positive feedback loop that promotes oedema development

D. Transudation is involved in a negative feedback loop that promoted oedema development

Explanation

The correct answer is C.

Diagram indicates that transudation causes a decrease in arterial blood volume, which leads to repetition of renin-aldosterone pathway, which would augment the transudation and oedema.

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