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1. Arteries have a much narrower lumen (the middle bit of space) and a much thicker wall. This is due to the fact that arterial walls contain more muscle and elastic fibres, than those of veins. Reason...

Water moves from the roots to the leaves through tissue called the xylem, in a process called transpiration. As water evaporates out of the leaf, more water is 'pulled upwards' to replace what has been lo...

Sarcomeres are formed of myosin and actin filaments which are interleaved. If myosin cannot bind to each other then thick filaments cannot be formed. Thus, there is nothing to anchor myosin so actin canno...

These processes are easily mixed up. Both Mitosis and Meiosis are typed of cell division, but the 2 processes end up with different results!

I always find it helpful to think of it like this:

The first thing that they do is detect a stimulus, this could be a change in temperature or sensation, then once they have done this they convert this into an impulse, which is eventually sent back to the...