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How do I answer a question asking me to describe and/or explain a graph?

These questions should be easy mark gainers as they don't usually require a lot of prior knowledge. However, many students find that they consistently lose all their marks on these questions. With many exam ...
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Answered by Kate B. • Biology tutor
21400 Views

Describe how the SAN and AVN control the cardiac cycle.

The student should think about this in steps starting with: 1. SAN initiates the heartbeat: The sinoatrial node (SAN) initates heart contraction by sending electrical impulses across the atria. These are ini...
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Answered by Elizabeth G. • Biology tutor
20876 Views

Describe the process of an action potential through a neuron

A stimulus (e.g. change in temperature, pain, etc.) results in the depolarisation of the membrane of the neuronal cell body. This depolarisation causes the membrane potential to rise from resting potential (...
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Answered by Emily C. • Biology tutor
5028 Views

What are the steps involved in the reflex pathway that would cause you to automatically move your hand off of a hot surface?

Heat is sensed by temperature receptors in the skin of the hand. The signal generated by the receptors in response to heat travels along a sensory neurone to the spinal cord. The signal causes the release of...
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Answered by Sian V. • Biology tutor
3534 Views

Why might the stomata of a leaf close on a hot day?

Despite the fact that the stomata open in response to light, they may close on a hot day in order to conserve water. This is because the heat may cause the water to evaporate out through the stomata, causing...
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Answered by Rebecca D. • Biology tutor
31723 Views