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What is the Doppler Effect?

The Doppler Effect is the strectching and compressing of waves caused by the movement of the source. Put more simply, when an object emits a sound - say a van beeping its horn it produces a sound of a certai...
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Answered by Sebastian J. • Physics tutor
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Explain the four processes of erosion in rivers.

Hydraulic action: This process involves air particles finding their way into the cracks of rocks. This then causes air particles to compress which adds pressure, causing rocks to break away and erode. Abrasi...
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Answered by Katie J. • Geography tutor
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What is mitosis?

Mitosis , or cell division, is a process where a single cell divides into two identical daughter cells . When answering this question it is important to be clear about what is being replicated. Simply saying...
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Answered by Claire H. • Biology tutor
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what are the differences between involuntary, cardiac and voluntary muscle?

Involuntary muscle (or smooth muscle) is innervated by the autonomic nervous system and therefore is not under conscious control. It is not striated - rather, muscle cells contain small bundles of actin and ...
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Answered by Dani E. • Biology tutor
50926 Views

How are signals transmitted across the synaptic cleft?

When the action potential reaches the synaptic knob it causes voltage-gated calcium ion channels to open, allowing calcium ions to diffuse in. These calcium ions cause synaptic vesicles containing acetylchol...
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Answered by Dani E. • Biology tutor
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