Nervous System Flashcards
Give two sensory functions
- Detection of changes in the environment
2. Sensory neurons transmit changes to CNS
What are the three given functions of the nervous system
Sensory functions ( afferent) Integrative functions Motor functions ( efferent)
Give two integrative functions of nervous system
Process, store and retrieve information
Make decisions
What kind of neurons are involved in integrative function
Interneurons ( association neurons)
Example of motor function
Motor neurons send signals from CNS to effector (muscles and glands)
Two components of nervous tissue
Neurons
Neuroglia
Neurons function
- Communication
2. Regenerate a severed portion of the PNS
Neuroglia facts
Outnumbers neurons 5-50 times
Support and protect the neurons
Can aid the functions of neurons
Can divide——-> brain tumors
Properties of neurons
Excitability
Conductivity
Secretion
Neuron excitability
Response to stimuli (changes in environment)
More sensitive than other cells
Conductivity properties
Produce electrical signal and conduct it along the plasma membrane
Secretion properties
Secrete NT
What is the equivalent of the rough ER in the neuron
Nissl body
Protein synthesis
What is in the trigger zone
Axon hillock and initial segment
Action potential is generated
What is myelin composed of
Layers of Schwann cells
What is the function of the mode of ranvier
Nerve signal is regenerated
Jumps/ speeds up signal
What is the branch of an axon called
Axon collateral
What is the content of an axon
Axoplasma
What is the plasma membrane of an axon called
Plasma membrane
Neuronal variety
Multipolar
Bipolar
Unipolar
Anaxonic
Where are multipolar found
Brain, spinal cord (motor)
