Ed Biology Gcse Coursework

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As a result of this research, current thinking suggests that while homeostasis controls the ‘minute-by-minute fluctuation in the environment’ , circadian rhythms control the body’s general programming over time.

In this essay, we will concentrate on two examples of homeostasis, one that occurs in humans and one which occurs in plants.

A receptor is responsible for detecting a change in the body, while the effector corrects this.

The control centre organises these two together to elicit the response.

Firstly, we will discuss the control of blood glucose levels in mammals, and then will look at the role of plant stomata in regulating water loss.

The human body has a number of mechanisms in place to regulate the storage and release of molecules for energy.

If this does not occur, the circuit will continue to direct effectors to warm the body because the feedback will not be switched ‘off’.

Recent research, however has added another dimension to the accepted definition of homeostasis.

The hypothalamus is a combined receptor and control centre, both recognising extremes of temperature change, and triggering bodily effectors to correct the changes.

Figure 1 shows the responses to a decrease in body temperature, which directs organs to increase metabolism, thus causing shivering.


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