ructure, Function, & formation Processin (Gather & synthesize information that sensory receptors respond to stimuli by sending messages to the brain for immediate behavior or storage as memories.) 08-LS1-8 Target 1 a – I can identify the structure and function of motor neuron, sensory neuron, and interneuron. Target 1 b – I can draw a model of motor neuron, sensory neuron, and interneuron.
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(Gather & synthesize information that sensory receptors respond to stimuli by sending messages to the brain for immediate behavior or storage as memories.)
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Structure, Function,&
Information Processing
(Gather & synthesize information that sensory receptors respond to stimuli by sending messages to the brain for immediate behavior or storage as memories.) 08-LS1-8
Target 1 a – I can identify the structure and function of motor neuron, sensory neuron, and interneuron.
Target 1 b – I can draw a model of motor neuron, sensory neuron, and interneuron.
Humans versus Simple Organisms
Simple organisms like a flat worm or planarian the nervous system is spread out and disorganized.
In more complex animals the nervous system becomes more complex and the tissue that makes up the nervous system is concentrated in the head.
Dendrites– the finger-like projections that surround the cell body. They receive electrical signals and relay the signals to the cell body.
Axon – is like a highway going AWAY from the cell body and dendrites to send signals to the synapse. It’s covered in a myelin sheath that insulates the axon which transmits electrical impulses. The speed of the impulse varies depending on the thickness of the myelin sheath.
Synapse – is an area between a dendrite and axon terminal where electrical and chemical signals cross from one neuron to another neuron until it reaches the brain.
•Receives information from interneurons•Transfers information to
“Effector Systems” like muscles, glands, & internal organs.
• The response or action that occurs after a stimulus (effect)• Examples:• - you shiver because a cold breeze blew
across your arm• - you get Goosebumps because
someone scratched their fingernails across the chalkboard• - your mouth begins to water because
you smell fried chicken cooking
Response (Reflexes) Defined
• Autonomic• Acts on its own without you consciously
trying to control it.• Examples:• Heart rate (blood pressure)changes as
your body changes to different conditions such as – your heart beats faster after you have just walked from one classroom to another. You don’t consciously think about raising your heart rate.
Response (Reflexes) Types
Experiment Time
Autonomic Experiment ExplanationThe reason your heart rate typically increases when you stand up is due to the fact that blood tends to settle in your legs and there is less blood in your heart. This causes your heart to work harder to pump more blood to increase your blood pressure until it reaches its normal level again. This is an autonomic reflex.