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What events occur during the cardiac cycle?

Within the heart the atria contract creating a high pressure and squeezing blood into the ventricles. The semi lunar valves are closed so pressure within the ventricles builds up.Pressure within the ventricl...
JH
Answered by James H. • Biology tutor
11918 Views

What is the difference between 'por' and 'para'?

First, it should be made clear that either of these phrases can be used to mean 'for' in English. The reason we have two different words in Spanish is because they are used for slightly different purposes. '...
LI
Answered by Lisa I. • Spanish tutor
5096 Views

How do I work out the area of a rectangle

ok. Well think about a square. What times what creates the area of a square? Yes the bottom one and side on. So which do you think will be useful to know to find the area of a rectangle? Yes the same! So the...
CW
Answered by Charlotte W. • Maths tutor
3892 Views

Describe how a capacitor works.

If you think of electrons as tennis balls being passed around by a circle of people, then a capacitor occurs when there is a gap between 2 people which is too large for the ball/electron to be passed on. Thi...
CW
Answered by Charlotte W. • Physics tutor
4851 Views

What features can be found at the mouth of a river?

1) As the river reaches the mouth, it has a large discharge and he river channel is deep and wide. The valley is now wide and flat. This creates a wide floodplain around the river. 2) A floodplain is a flat ...
GE
Answered by Gareth E. • Geography tutor
27072 Views