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Nervous System (Command and Control Center (MRI: Magnetic resonance…
Nervous System
Command and Control Center
neurons: nerve cells
MRI: Magnetic resonance imaging
technique to record brain activity
ability to sense and react
originated billions years ago w/ prokaryotes
detects changes in environment, enhance survival and reproductive success
locating food sources by chemotaxis
provided multicellular organisms w/ mechanism for communication between cells in body
Cambrian explosion
system of neurons allowed animals to sense and move rapidly into present day forms
Nervous system consist of circuits of neurons and supporting cells
Organization of Nervous Systems
Vocab
Nerve nets
: diffused network of neurons that conducts impulses in all directions from a point of stimulus
the more nerves and nets an animals has --> greater mobility and more complex movements
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Nerves
: bundles of fiber like extensions of neurons
CNS
: central nervous system: a brain with longitudinal nerve cords
Ganglia
: arranged cluster of neurons
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PNS
: peripheral nervous system: nerves that connect the CNS to rest of body
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all animals except for sponges have a nervous system
Information Processing
3 stages
2: Integration
interneurons
analyze and interpret
3: motor output
motor neurons
effector cells
muscles or endocrine cells
1: sensory input
sensory neurons
transmit info from sensors that detect
external stimuli
light, sound, taste, heat, smell, touch
internal conditions
blood pressure, CO2 levels, muscle tensions
Neuron structure