Phys. Unit 4
Quiz yourself by thinking what should be in
each of the black spaces below before clicking
on it to display the answer.
Help!
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| Central nervous system components | show 🗑
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| show | central and peripheral systems
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| peripheral nervous system components | show 🗑
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| show | 15-20% of total blood supply
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| show | 1.5 kg and about 2% of weight of 70 kg man
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| What secretes cerebrospinal fluid? | show 🗑
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| show | A tissue complex made by the ependyma neuroglia and controls rates of entry and types of substances allowed in
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| show | Sensory organs to CNS
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| Direction of efferent NS? | show 🗑
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| Myelination description | show 🗑
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| show | Neurons and neuroglia
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| What is basic communication unit of NS? | show 🗑
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| Part of neuron that receives stimulus | show 🗑
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| What synthesizes proteins and neurotransmitters? | show 🗑
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| Where is the action potential initiated? | show 🗑
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| show | interneurons (200,000)
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| Least common type of neuron | show 🗑
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| show | long dendrites, short axons
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| show | short dendrites, long axons
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| show | short dendrites, and either long or short axons
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| show | neurons- 10%
neuroglia- 90%
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| show | neuroglia are smaller, neurons are larger
volume is occupied in 50/50 neurons/neuroglia
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| Somatic Division definition | show 🗑
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| Transmission at synapse | show 🗑
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| Synapses definition | show 🗑
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| How many synapses does a spinal neuron have? | show 🗑
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| show | 100 x 10^3
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| Autonomic Division definition | show 🗑
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| show | autonomic division
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| What is the name for adrenal secretions? | show 🗑
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| show | 20%- norepinephrine
80%- epinephrine
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| Sympathetic division secretions? | show 🗑
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| Cholinergic receptors | show 🗑
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| show | ACH
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| show | 1. Alpha- excitatory or stimulatory
2. Beta- inhibitory
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| What binds to adrenergic receptors? | show 🗑
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| show | Cardiac muscle-norepinephrine binds to beta receptors (excitatory response)
**(NE is not supposed to bind to beta receptors and not excitatory)
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| show | -70 mV
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| show | 1. Apply excitatory stimulus
2. Na channels open and K channels close
3. Na influx and cell becomes more positive (30-40 mV)
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| Repolarization definition | show 🗑
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| show | 1. Apply an inhibitory stimulus
2. K channels open, Na channels close
3. K effux, cell becomes more negative than resting potential (Vm)
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| Threshold value | show 🗑
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| show | 1. K+: -90 mV (more inside cell)
2. Na+: +60 mV (more outside cell)
3. Cl-: -70 mV (do not contribute to membrane signals)
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| Types of potentials | show 🗑
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| show | 1. created by subthreshold stimulus
2. amplitude/size depends on strength of stimulus
3. transmitted decrementally
4. useful in local or short distances
5. can be summed up to make an action potential
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| Action potential | show 🗑
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| show | +15 mV
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| Magnitude or size of AP determined by what? | show 🗑
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| Refractory periods | show 🗑
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| Where is summation of a signal done on a neuron? | show 🗑
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Created by:
kcapland
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