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Animal Phys 3
Nervous System
| Question | Answer |
|---|---|
| What are the two types of Synapses? | Chemical & electrical |
| The arrival of an action potential in the axon terminal opens what gate? | Calcium gate |
| What does calcium do? | Triggers vesicle fusion and & transmitter release |
| Neurotransmitters can bind to what receptors? | Ionotropic receptors and open ion channels or metabotropic G protein-coupled receptors and activate G proteins |
| Describe chemical sysnapses | can increase current flow in post-synaptic cell can be excitatory or inhibitory are unidirectional, whereas electrical is multidirectional modified with use (plasticity) meaning it can strengthen with use or be lost when not used |
| What is temporal summation? | occurs when the same synapse fires multiple times, adding up the signals from a single axon, more times it fires the more depolarization |
| what is spatial summation? | occurs when multiple axons work on a single neuron, action potential generated once threshold reached, if the parts do not reach the threshold then a graded potential is generated and you get depolarization in a small area |
| what is gray matter? | part of CNS where cell bodies are found |
| what is white matter? | bunches of axons |
| what are dendrites | structures for input |
| What do axons do? | they transmit info out of cell |
| what does the axon hillock do? | generates action potential |
| what is the reflex arc | input is sensory and output is motor and the info doesn't have to go all the way to the brain; movement of skeletal striated muscles is involuntary |
| how many different types of glial cells do humans have | 6 |
| the nervous system is largely made up of | glial cells |
| what are glial cells | support cells for neurons |
| what is the myelin sheath and how is it made | it is a lipid membrane that insulates the axon and made of Schwann cells |
| what is the chemical synapse | junction between 1 neuron and the next cell |
| what is the synaptic cleft | the space between the end of an axon and the next cell |
| synaptic vessicles are filled with | neurotransmitters |
| what are presynaptic densities | areas where synaptic vesicle attaches |
| what are postsynaptic densities | receptors |
Created by:
dfoste13
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