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When an action potential arrives at the pre-synaptic neurone, it causes a change in voltage due to the presence of positive Na ions. This causes voltage-gated Ca 2+ protein channels to open and allow calc...

An organelle found in all eukaryotic cells made of thin microfilaments of the protein actin and microtubules made of the protein tubulin. Transport is the key role where motor proteins drag organelles fro...

Guard cells open and close the stomata in a leaf. When the plant has lots of water the guard cells fill with it and become plump and turgid. This makes the stomata open so gases can be exchanged for photo...

3x + y =23, 4x +4y=5212x+4y=92, 12x+12y=1568y=64y=8sub in3x+8=23, 3x=15x=5y=8x=5

An alpha particle has a much larger volume than a β particle, so when passing by an atom it is more likely to collide with an electron and knock it out of the atom causing the atom to be ionised (meaning ...