Functions of the Nervous System Notes Flashcards
what is the nervous
master controlling and communicating system of the body
whats the three functions of the nervous system
sensory
integration
motor output
sensory
info. gathered by sensory receptors about internal and external changes
integration
processing and interpetation of sensory input
motor output
activation of effector organs(muscles and glands) produces a response
what two parts is the nervous sytem divided into
CNS
PNS
CNS
Brain and spinal cord
integration and control center
-interprets sensory input and dictates motor output
PNS
portion of nervous system outside the CNS
whats the two major neuroglia in the PNS
satellite cells
Schawnn cells
satellite cells
- surround neuron cell bodies in PNS
- function similar to astrocytes of CNS
Schawnn cells(neurolemmocytes)
surround all peripheral nerve fibers and form myelin sheaths in thicker nerve fibers
whats the structural units of the nervous system
neurons(nerve cells)
whats the special characteristics of neurons
extreme longevity(lasts a person’s lifetime)
Amitotic, with few exceptions
high metabolic rate: requires continous supply of oxygen and glucose
all have soma and one or more processes
biosynethetic center of neuron
- synthesizes proteins,membranes, chemicals
- rough ER(chromatophilic substance, or NIssl bodies)
what can some neurons contain
pigments
whats the receptive region in most neurons
plasma membrane, is the receptive region that receives input info from other neurons