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The heart's excitation is myogenic and therefore can be started without any transmission from the brain. The sino-atrial node is found behind the posterior wall of the left atrium and is where the action ...

A catalyst increases the rate of the reaction because: 

• They provide an alternative energy pathway that has a lower activation energy 

• This means that more particles hav...

The image is of what looks to be a quarry. In the left of the image there is a lake, possibly with waste materials from the quarry. There are roads leading away from the area on the right, presumably to c...

Meta-ethics is the branch of ethics that aims to determine the usefulness of ethical language.

Cognitivists believe that ethical language is meaningful, thus implying that everyone should know what...

1. Friction from passing over the land makes them lose their energy

2. Land at high altitudes and water have a cooling effect, causing a loss of energy