The Nervous System

3. A collection of neuron cell bodies is called a _______.
4. The _______ nervous system is a division of the peripheral nervous system that controls the contraction of skeletal muscle.
5. An _______ post-synaptic potential can be caused by the closing of potassium channels.
8. _______ is the brain's primary excitatory neurotransmitter.
9. An action potential will be generated along an axon if the graded potential is above the _______ value once it reaches the integrating zone.
10. An _______ post-synaptic potential can be caused by the opening of chloride channels.
11. Neurotransmitter moves across the synaptic cleft by _______.
13. _______ contain the neurotransmitter and release it into the synaptic cleft.

1. The long extensions that receive information from other neurons are called _______.
2. In somatic motor pathways, _______ receptors are activated at neuromuscular junctions.
5. Neurotransmitter leaves axon terminals by the process of _______.
6. The term used when multiple neurons innervate a single neuron.
7. The _______ nervous system is divided into the sympathetic and parasympathetic nervous systems.
12. Increasing the frequency at which pre-synaptic neurons fire at a post-synaptic neuron is called _______ summation.
14. Depolarisation along an axon terminal causes the opening of voltage-gated _______ channels.