BLG 101 lec 11
Nervous system - answerControlling and communicating system of body
-> communicate through electrical and chemical signals
Functions of nervous system - answer1. Sensory input (gather info from external and
internal changes)
2. Integration (processing)
3. Motor output (activation of effector)
Nervous system in 2 principal parts - answerCentral nervous system:
- brain and spinal cord
- integration and control center
Peripheral nervous system
- outside CNS
- consist of spinal and cranial nerves
Neuroglia (glial cells) - answerSmall cells that surround and wrap delicate neurons
Neurons (nerve cells) - answerExcitable cells that transmits electrical signals
Four main neuroglia support CNS neurons - answer- Astrocytes
- Microglial cells
-Ependymal cells
- Oligodendrocytes
Astrocytes - answer- Most abundant CNS neuroglia
- responsible for blood brain barrier
Microglial cells - answer- thorny processes that touch and monitor neurons
- ensure pathogens dont come in
Ependymal cells - answer- cilia beat to circulate CSF
- line CSF filled CNS cavities
Oligodendrocytes - answerProcesses wrap CNS nerve fibres, forming insulating myelin
sheaths (speed up info)
Nervous system - answerControlling and communicating system of body
-> communicate through electrical and chemical signals
Functions of nervous system - answer1. Sensory input (gather info from external and
internal changes)
2. Integration (processing)
3. Motor output (activation of effector)
Nervous system in 2 principal parts - answerCentral nervous system:
- brain and spinal cord
- integration and control center
Peripheral nervous system
- outside CNS
- consist of spinal and cranial nerves
Neuroglia (glial cells) - answerSmall cells that surround and wrap delicate neurons
Neurons (nerve cells) - answerExcitable cells that transmits electrical signals
Four main neuroglia support CNS neurons - answer- Astrocytes
- Microglial cells
-Ependymal cells
- Oligodendrocytes
Astrocytes - answer- Most abundant CNS neuroglia
- responsible for blood brain barrier
Microglial cells - answer- thorny processes that touch and monitor neurons
- ensure pathogens dont come in
Ependymal cells - answer- cilia beat to circulate CSF
- line CSF filled CNS cavities
Oligodendrocytes - answerProcesses wrap CNS nerve fibres, forming insulating myelin
sheaths (speed up info)
