Nervous System Mas Maganda

1,403 views
1,368 views

Published on

Published in: Health & Medicine
0 Comments
0 Likes
Statistics
Notes
  • Be the first to comment

  • Be the first to like this

No Downloads
Views
Total views
1,403
On SlideShare
0
From Embeds
0
Number of Embeds
1
Actions
Shares
0
Downloads
195
Comments
0
Likes
0
Embeds 0
No embeds

No notes for slide

Nervous System Mas Maganda

  1. 1. Nervous system
  2. 2. Action potential <ul><li>Caused by voltage difference across the plasma membrane </li></ul><ul><li>Due to ionic composition </li></ul><ul><ul><li>Inside: more K + than Na + </li></ul></ul><ul><ul><li>Outside: more Na + than K + </li></ul></ul><ul><ul><li>Anions: primarily inside and composed of large molecules </li></ul></ul>
  3. 3. Channels <ul><li>Channels are responsible for the permeability of the membrane </li></ul><ul><ul><li>Voltage-gated ion channels </li></ul></ul><ul><ul><li>Chemically-gated ion channels </li></ul></ul>
  4. 5. Propagation of AP <ul><li>Neuron is stimulated </li></ul><ul><li>Voltage-gated ion channels will open </li></ul><ul><li>K will move outside due to conc gradient </li></ul><ul><li>Will return due to electrical gradient </li></ul><ul><li>Na reverse reaction of K </li></ul><ul><li>Resting membrane potential of -70mV rather than -85mV </li></ul>
  5. 6. REMEMBER!!!!!!!!!!!!!!! <ul><li>Dissipation of membrane potential is hindered due to the presence of the sodium potassium pump </li></ul>
  6. 7. The very important graph
  7. 8. The very important terms…… <ul><li>Polarization- creation of different charges inside/outside the cell membrane </li></ul><ul><li>Depolarization- membrane is more positive (dec in electrical gradient) </li></ul><ul><li>Hyperpolarization- membrane is more negative (inc electrical gradient) </li></ul>
  8. 9. Terms pa rin…….. <ul><li>Threshold potential- amount of potential difference needed to create an action potential </li></ul><ul><li>Action potential- electrical stimulus that creates signal/message in an axon </li></ul><ul><li>Hyperpolarization- do not produce action potential </li></ul>
  9. 10. <ul><li>Graded potential if it is dependent on the amount of stimulus </li></ul><ul><li>Action potential in case of neurons that need to meet the threshold potential </li></ul>
  10. 11. AP is the nerve impulse <ul><li>TANDAAN!!!!!! </li></ul><ul><ul><li>Nongraded all or none response/event </li></ul></ul>
  11. 12. Ang pagbabalik…….
  12. 13. Ano ba nangyayari? <ul><li>Start with voltage-gated ion channel </li></ul><ul><ul><li>K- one gate; closed-resting, opens slowly during depolarization </li></ul></ul><ul><ul><li>Na- two gates; activation gate- closed-resting, opens rapidly during depolarization </li></ul></ul><ul><ul><li>inactivation gate- open when resting, closes slowly due to depolarization </li></ul></ul>
  13. 14. Huh? <ul><li>K is responsible for hyperpolarization because they remain open during repolarization </li></ul><ul><li>Na is responsible for depolarization </li></ul>
  14. 15. synapse <ul><li>Voltage </li></ul><ul><li>Chemical </li></ul>
  15. 16. EPSP vs IPSP <ul><li>Excitatory postsynaptic potential </li></ul><ul><li>Inhibitory postsynaptic potential </li></ul><ul><ul><li>Temporal vs summation </li></ul></ul>
  16. 17. Magbasa…….. <ul><li>Magbasa ng mga neurotransmitter at different kinds ng organization of nervous system </li></ul>
  17. 18. Hyperpolarization <ul><li>Responsible for the unidirectional movement of the action potential </li></ul>

×