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Outline the events that occur within the heart, which cause blood to move around the body.

One of the most crucial functions of the heart is to act as a pump which distributes the blood around the body. The blood is first collected in the atria, and then pumped from atria to the ventricles. The at...
JK
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How do muscles contract? Describe the sliding filament theory.

When an action potential from a motor neurone stimulates a muscle cell, a number of things happen to cause sarcomeres (the smallest contracting unit of a muscle cell) to shorten and contract very rapidly. Ca...
IL
Answered by Isabel L. • Biology tutor
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Given a graph of the displacement of a particle, how can you tell if it is in Simple Harmonic Motion?

There are two main features if an object is in SHM. The first is that it has a fixed maximum amplitude. That is to say, if the mean (halfway between the maximum values of oscillation (+ve and -ve)) displacem...
JT
Answered by Johnny T. • Physics tutor
3216 Views

How is the role of the British Prime Minister changing?

This is an example of an essay question that could be asked (with slight variation) for a paper on British Politics. An approach to the question will need to be twofold - firstly the content needs to be addr...
MF
3875 Views

Describe the structure and bonding of sodium chloride

Sodium chloride is a giant ionic lattice consisting of alternating, adjacent positively charged sodium ions and negatively charged chloride ions in a regular arrangement of rows and columns. The ions are hel...
OH
Answered by Olivia H. • Chemistry tutor
39562 Views