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Explain the difference between diffusion and active transport with examples.

Diffusion is the passive process by which molecules move across a semi permeable membrane down their concentration gradient from an area of high concentration to low concentration. An example is gaseous exch...
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Answered by Sarah M. • Biology tutor
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Explain how blood circulates through the heart?

Firstly we need to know the anatomy of the heart. The heart is made up of four chambers, the top two are called Atria and the bottom two are called ventricles, the heart is also split up into a left side and...
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Answered by Scott W. • Biology tutor
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How do synapses work?

Each neuron does not directly end on another neuron, there is a small gap between two neurons called a synapse. In order for an impulse to be generated in the next neuron, a chemical transmitter is released....
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Answered by Adama L. • Biology tutor
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How does cholinergis transmission occur at a neuromuscular junction?

The presynaptic terminal is invaded by an action potential whihc causes an influx of calcium ions. The calcium ions then cause the vesicles cointaining acetylcholine to fuse with the presynaptic membrane and...
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Answered by Alex M. • Biology tutor
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Function of the heart.

The funtion of the heart is to supply the body with oxygenated blood. In humans this is done by use of a double circulatory system. This means that the blood enters the heart twice before it is pumped to the...
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Answered by Peter C. • Biology tutor
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