nervous tissue 1&2 Flashcards
what is the main control over the bodys functions
the nervous system
the nervous system receives stimuli from the body and environment via
sensory receptors
nervous system processes info to initiate an
appropriate response
the nervous system receives, processes and sends info via
neurons
neurons are supported by
neuroglial cells
neurons maintain a _____ potential inside their plasma membrane
negative
Na+-K+ pump
neurons respond to stimuli with a wave of
depolarization
where do neurons transmit the stimulus to
muscles, glands and other neurons (synapses)
2 main components of nervous system
central nervous system and peripheral nervous system
central nervous system
- brain and spinal cord
- processing and command functions
peripheral nervous system
- all nervous tissue outside of CNS
- relays sensory info to CNS
- directs commands from CNS to the effector organs
PNS consists of 2 divisions
afferent (towards CNS, SENSORY) and efferent (away from CNS, MOTOR)
afferent division of PNS
- towards CNS
- sensory pathway
- somatic sensory receptors
- visceral sensory receptors
efferent division of PNS
- away from CNS
- motor pathway
- somatic nervous system to skeletal muscle
- autonomic nervous system to viscera
autonomic nervous system consists of what two divisions
PNS –> efferent –> autonomic
- sympathetic (fight or flight)
- parasympathetic (rest and digest)
summary of 4 main divisions of the PNS
- general somatic afferent (sensory)
to CNS from receptors in skeletal muscle and skin; pressure and pain receptors - general visceral afferent (sensory)
to CNS from heart, GI tract, urinary and reproductive systems - general somatic efferent (motor)
from CNS to skeletal muscle - autonomic nervous system (motor)
sympathetic and parasympathetic, from CNS to viscera, secretory cells
general somatic afferent (sensory)
to CNS from receptors in skeletal muscle and skin; pressure and pain receptors
general visceral afferent (sensory)
to CNS from heart, GI tract, urinary and reproductive systems
general somatic efferent (motor)
from CNS to skeletal muscle
neurons consist of what 3 parts
- cell body (perikaryon, soma)
- one axon
- one or more dendrite
cell body of neuron nucelus
large round and centrally placed with a prominent nucleolus
cell body of neuron; cytoplasm has a large amount of ____ and numerous ____
rER (Nissl substance/ bodies)
mitochondria
in cell body of neuron, golgi apparatus is responsible for packaging
neurotransmitters
most neuron cells bodies are located in the
CNS