the role of the nervous system Flashcards
1
Q
what are the three basic functions of the nervous system?
A
- sensory changes with sensory receptors
- interpreting and remembering those changes
- reaction to those changes with effectors
2
Q
what does the central nervous system control
A
brain and spinal cord
3
Q
what does the peripheral nervous system control
A
- spinal nerves
- cranial nerves
4
Q
3 main parts of the neuron
A
- cell body
- dendrites
- axon
5
Q
what do neurons conduct and at what speed
A
- conduct electrical impulses
- speed from 0.5 to 130 m/s
6
Q
what do neurons connect
A
they connect receptors to the CNS and also connect one part of the nervous system to another i.e. brain and spinal cord
7
Q
where can neurons carry impulses from
A
from nervous system to effector organs such as muscles and glands
8
Q
3 basic neuron types
A
- bipolar
- unipolar
- multipolar
9
Q
what are neuroglia
A
- 10-15x more numerous than neurons
- supportive tissue
- half volume of CNS
- capable of rapid division
- non-excitable
- holds CNS together
10
Q
primary function of neuroglia
A
- support the neurosn
- term means ‘nerve glue’
11
Q
4 cell types of neuroglia in CNS
A
- astrocytes
- oligodendrocytes
- microglia
- ependymal
(glial cells)
12
Q
2 cell types in PNS
A
- schwann
- satellite cells
13
Q
function of glial cells (microglia)
A
- small cells found near blood vessels
- clean up debris
- transport nutrients to neurons
- promote synaptic connections
14
Q
functions of glial cells (oligodendrocytes)
A
- most common cell type
- close to neuron
- forms myelin sheath in CNS (similar to shwann cells)
15
Q
functions of glial cells (ependymal)
A
- produce cerebrospinal fluid (CSF)
