Neurons They transmit info throughout the body Very basic building block of the

Neurons they transmit info throughout the body very

This preview shows page 6 - 10 out of 12 pages.

Neurons
Background image
They transmit info throughout the body. Very basic building block of the nervous system. Types of neurons: Sensoryneurons (cactus → brain)- send info from the physical world to the brain. Involves the five senses. EX. “This cactus is sharp” Interneurons (brain → spinal cord)- communicate between sensory and motor neurons (communicate between the other two; sensory and motor). “Hey apparently that cactus is sharp what should we do about it?” Motorneurons (CNS → muscles)- in charge of movements. “Look how big my muscles are” *Ford flexes* Tell muscles to contract or relax. “How about I pull my hand away from this cactus” Structure of a Neuron (info in dendrites → cell body → axon → axon terminal) Dendrites- branch like extensions that detect chemical signals from other neurons and carry them to the cell body. Help bring info from outside the cell to inside the cell. Cell body (Soma)- collects and integrates info received through the dendrites Axon- carries info from the cell body to the terminal buttons. Terminal buttons- release info from the neuron to the dendrites of other neurons. Then the process will start all over in the next neuron. EX. Airport analogy Dendrites are where you arrive at the airport. Cell body is the terminal where u find your flight. (organized and processed info) Axon (info travels down axon) would be your flight from memphis to somewhere.
Background image
Terminal buttons is like the airport where you land a.k.a. Chicago Neural communication voors loves dick Synapse- gap between one neuron’s axon and another neuron’s dendrite. The space between two neurons.( EX. You continue your travels but your flight out of chicago leaves from the Midway) Neurotransmitters- chemical substances that travel across the synapse to transmit signals from one neuron to another. (taxi’s that go between the airports) *Get familiar with your neurotransmitters* Acetylcholine - motor control over muscles Epinephrine - fight or flight Dopamine - reward and motivation Norepinephrine - Arousal and attention Serotonin - emotions GABA - Inhibition of action potentials Glutamate - Excitation of action potentials Endorphins - pain reduction Action potential: neural firing- electrical signal that passes along the axon. Channels open: sodium rushes in, potassium rushes out (this changes the mV (positive and negative charge) Depolarization - becoming more positive inside the neuron (becoming more of the same on the inside and outside) Repolarization - becoming more negative (more opposite on the inside than the outside) luke cannon is gay The Maximum/Climax is Action potential (at the peak the channels close) 1. Signal from the dendritesreaches minimum threshold 2. Sodium & Potassium channels open (sodium in, potassium out)
Background image
3. Neuron’s charge goes from negative to positive 4. Signal goes down the axon 5. Sodium & Potassium channels close 6. Neuron returns to resting state Resting membrane potential: electrical charge of a neuron At Rest= -70 millivolts inside the cell (more negatively charged on the inside of the cell than on the outside = polarized).
Background image
Image of page 10

You've reached the end of your free preview.

Want to read all 12 pages?

  • Spring '12
  • BORIDERI
  • Psychology, current state

  • Left Quote Icon

    Student Picture

  • Left Quote Icon

    Student Picture

  • Left Quote Icon

    Student Picture