click below
click below
Normal Size Small Size show me how
The Nervous System 2
Questions
Question | Answer |
---|---|
What are the difference between myelinated & non-myelinated neurons? | Myelinated has faster transmission, conduction & faster transfer of impulses |
Why is an action potential "all or none" response? | Any stimuli stronger than minimum threshold level will produce same action potential |
How does the brain interpret stimulus strength? | Determined by the number of action potentials and/or number of neurons activated |
What are the five essential components of a reflex arc? | -Sensory Receptor -Sensory Neuron -Interneuron in spinal cord -Motor Neuron -Effector |
Describe the components of the Peripheral Nervous System | Somatic & Autonomic Nervous Systems |
What is happening in the neuron membrane during the: resting period, depolarization, repolarization & the refractory period during an action potential? | Resting- Pump active/K+ channel "leaky" Depolarization - Na+ channel open/pump inactive Repolarization - K+ channel open/pump inactive Refractory - Pump active/K+ channel "leaky" |
What is the difference between an excitatory & inhibitory response in the postsynaptic membrane? | Excitatory cause PS neuron to be more permeable to Na+ Inhibitory cause PS neuron to be more permeable to K+ |
What are the three basic types of neurons? | Sensory, Interneurons & Motor |
What are the components of the forebrain | Thalamus, hypothalamus & cerebrum |
What are the components of the hindbrain? | Medulla Oblongata, Pons & Cerebellum |
What are the various neurotransmitters? What are their effects on the brain? | Acetylcholine, Dopamine, Serotonin, Epinephrine/Norepinephrine, Inhibtory NTs, Endorphins - Influence the activity of the postsynaptic neuron |