Psych 115 Quiz 2 Questions and 100% Correct Answers
1 view 0 purchase
Course
PSYC 115
Institution
PSYC 115
Basis of neuronal communication - dendrite: input - body: processing/protein production - axon hillock: integration, lots of Na+ channels - axon: conduction - terminal: output, electrical signal converted to chemical signal
Threshold of activation -55 mV ---> depolarizes to +50mv (action potent...
Psych 115 Quiz 2 Questions and 100%
Correct Answers
Basis of neuronal communication ✅- dendrite: input
- body: processing/protein production
- axon hillock: integration, lots of Na+ channels
- axon: conduction
- terminal: output, electrical signal converted to chemical signal
Threshold of activation ✅-55 mV ---> depolarizes to +50mv
(action potential is the reversal of membrane potential from -70mv to +50mv)
factors of the velocity of action potential ✅- Thickness: decreased internal resistance
to passive current flow
- Myelination: allows for saltatory conduction, Na+ channels are concentrated at the
nodes of Ranvier, involves passive + instant signaling
Three types of glial cells ✅astrocytes, microglia, oligodendrocytes + Schwann cells
Astrocytes (def, func) ✅star-shaped cells that connect small blood vessels to neurons
+ take up and release NT
Microglia ✅Act as phagocytes, engulfs damaged cells and bacteria, act as the brains
immune system, important for neural pain and synapse maintenance
Oligodendrocytes and Schwann cells ✅produce myelin around axons; CNS and PNS
respectively
Multiple Sclerosis (MS) ✅- destruction of the myelin sheath & replaced by plaques of
sclerotic (hard) tissue
- results in weakness, paralysis or spasms, impaired coordination, visual problems
Three types of synapses ✅axodendritic, axosomatic, axoaxonic
Sequence of Neurotransmission ✅action potential travel down to terminal -->
depolarizations leads to opening of Ca+ channels --> influx of Ca+ promotes fusing of
vesicles with presynaptic membrane of exocytosis to occur --> NT binds to receptor in
the postsynaptic membrane --> EPSP or IPSP spread passively over the dendrites of
the postsynaptic neuron to the hillock
Types of NT receptors ✅- ionotropic: fast acting
- metabotropic: slower, G-proteins needs to be activated
The benefits of buying summaries with Stuvia:
Guaranteed quality through customer reviews
Stuvia customers have reviewed more than 700,000 summaries. This how you know that you are buying the best documents.
Quick and easy check-out
You can quickly pay through credit card or Stuvia-credit for the summaries. There is no membership needed.
Focus on what matters
Your fellow students write the study notes themselves, which is why the documents are always reliable and up-to-date. This ensures you quickly get to the core!
Frequently asked questions
What do I get when I buy this document?
You get a PDF, available immediately after your purchase. The purchased document is accessible anytime, anywhere and indefinitely through your profile.
Satisfaction guarantee: how does it work?
Our satisfaction guarantee ensures that you always find a study document that suits you well. You fill out a form, and our customer service team takes care of the rest.
Who am I buying these notes from?
Stuvia is a marketplace, so you are not buying this document from us, but from seller twishfrancis. Stuvia facilitates payment to the seller.
Will I be stuck with a subscription?
No, you only buy these notes for $8.99. You're not tied to anything after your purchase.
