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Chemical synapses at a glance

Labelled chemical synapse showing presynaptic knob, synaptic cleft, Ca²⁺ entry, neurotransmitter release, receptors, and Na⁺ entry into the postsynaptic neurone A chemical synapse is a tiny junction where one neurone passes a signal to another neurone or to an effector such as a muscle cell. At most synapses, the signal changes from electrical to chemical and then back to electrical.

Synapses and neurotransmitters Lesson

A Level
Biology
Synapses and neurotransmitters

Step-by-step lessons covering Edexcel A A Level Biology Synapses and neurotransmitters for A Level Biology. Each lesson works through exam-style questions in Paper 1, Paper 2 and Paper 3 format. Build a strong foundation in cell biology and biochemistry early on, since later topics on genetics, ecology and physiology all draw on these core concepts.

Lessons

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Chemical synapses at a glance

Labelled chemical synapse showing presynaptic knob, synaptic cleft, Ca²⁺ entry, neurotransmitter release, receptors, and Na⁺ entry into the postsynaptic neurone A chemical synapse is a tiny junction where one neurone passes a signal to another neurone or to an effector such as a muscle cell. At most synapses, the signal changes from electrical to chemical and then back to electrical.

Synapses and neurotransmitters Lesson

A Level
Biology
Synapses and neurotransmitters

Step-by-step lessons covering Edexcel A A Level Biology Synapses and neurotransmitters for A Level Biology. Each lesson works through exam-style questions in Paper 1, Paper 2 and Paper 3 format. Build a strong foundation in cell biology and biochemistry early on, since later topics on genetics, ecology and physiology all draw on these core concepts.