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Cjs/315 Week 3

Submitted By
Words 799
Pages 4
Carrie Hubeny
CJUS 3152
September 10, 2014
1. What purpose do synapses serve?
Everything the human body does is controlled by signals. When you move your finger, your brain sends a signal that then tells your finger to move. A synapse is the site where the axon of the presynaptic terminal is close to the dendrites of the postsynaptic terminal. The synapse is there to transfer the information from one neuron to another, but the two neurons are not physically connected. To cross the synapse, the signal is changed from an electrical signal to a chemical signal and back to an electrical signal. The synapse is where signals pass between neurons.

2. The brain is an organ that regulates body functions, behaviors, and emotions. Neurons are the cells that fulfill these functions. How do neurons do this? …show more content…
The dendrite receives the signal, which is then sent down the axon and it sends the signal to the dendrites on another neuron. The presynaptic neuron sends the signal, and the postsynaptic neuron receives the signal. Neurons use electrical signals, called action potentials, to send the information down the neuron. When the signal is passed from the presynaptic neuron to the postsynaptic neuron, the signal is changed from an electrical signal to a chemical signal and back to an electrical signal.

3. What is the difference between excitatory and inhibitory neurotransmitters?
Excitatory neurotransmitters cause the action potential to be fired more rapidly through depolarization. The depolarization causes the charge to get past the threshold of about -40 mV to -80 mV, so that the action potential can be fired. Inhibitory neurotransmitters cause the action potential to not be fired through hyperpolarization. This causes the threshold to not be reached, and if the threshold is not reached then an action potential can not be fired.

4. What is the function of

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