3.4 - Nervous system, Neurotransmitters and Synapse

• excitatory increases contraction of muscle fibres
• inhibitory decreases the contraction of muscle fibres
• neurotransmitters bind to receptors
• its the type of receptor that determines whether a signal is excitatory or inhibitory
• neurons are adapted to carry electrical impulses and they have long fibres to carry impulses through the nervous system
• impulses are conducted away from the cell body towards the dendrites of the neuron
• myelin sheath increases speed of transmission of the impulse