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The electrical signal arrives at the first neuron. Neurotransmitters are released into cleft.They diffuse across the cleft and bind to receptors on the 2nd neuron.Electrical impulse is generated in second...

Mitochondria: (statements should be comparative)Has a double membrane;No cell wall;No capsule;No flagellum/ pili;No mesosome;No plasmids

Facilitated diffusion involves the use of channel and carrier proteins to assist the diffusion of molecules or ions down a concentration gradient, as this is a passive process it does not require ATP (the...

The pacemaker cells of the sino-atrial node in the right atrium generate an impulse.This impulse travels through the atria, causing depolarisation of cardiac muscle cells and atrial contraction.The impuls...

Excess nitrates and phosphates are water soluble and enter rivers/lakes/waterway due to leaching.Algae in the water use the increased level of ions for growth. This is called Algal bloom.Build up of algae...