Neural communication Flashcards
Homeostasis
Maintenance of a variable at a set level despite significant environmental change
How does homeostasis work?
It works by measuring a set point if the variable goes outside of that set point an action is generated
Pathway of system- simple
- A receptor will measure the variable
- A receptor will generate a signal
- Signal goes to integration centre
What is a reflex
Involuntary, unpremeditated, unlearned response
CNS involved
Peripheral nervous system description
A system when receptors collect info and transmit it back as an electric signal into CNS and processes it then is passed back to the periphery
Reflex arc pathway
Receptor to afferent neuron to integrating Center to efferent neuron to effector
Where are inter neurons
In the CNS
What is the most simple reflex and why
Patella reflex as it is monosynaptic
Dendrites function
Receives information
Cell body function
Integrates info
Axon hillock function
Generates an electrical signal
Axon function
Long distance transfer
Terminal
Transfer of info
Why is ther an unequal distribution of cells
Sodium potassium pump
Large negative proteins
Ion channels
Actions of the sodium potassium pump
- ATP will undergo dephosphorylation to ADP and phosphate
- Conformational change of protein pump
- 3 sodium ions bind to pump and exit the cell
- ADP and phosphate undergo phosphorylation
Conformation change - 2 potassium ions bind to pump and enter cell
How is a dynamic system set up
By the pump releasing sodium then wanting it back in again
Differential permeability is
We can control this which means we can control action potiential
Leaky channels
Allow ions to freely go through and need no electrical signal help
Mechanically gated channels
When pressure is applied they open
Ligand gated channeld
Will open when a ligand binds to a receptor
Voltage gated channels
Opens for a change in membrane potiential
