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Understanding Nervous System Neurons and Impulses

Explore different types of neurons - sensory, motor, and interneurons, as well as the transmission of nerve impulses. Learn about nerve impulses, resting and action potentials, neurotransmitters, and the effects of drugs on the nervous system. Discover the roles of sensory receptors - mechanoreceptors, thermoreceptors, pain receptors, chemoreceptors, and photoreceptors.

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Understanding Nervous System Neurons and Impulses

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  1. PP 1016-1024 Nervous System Part II NERVOUS SYSTEM II

  2. TYPES OF NEURONS • sensory – sense organs/receptors to CNS. • motor – carry information from CNS to muscles and glands • interneurons – connect sensory and motor and carry impulses between them.

  3. NERVE IMPULSES • An electrical impulse • Resting potential: inactive due to “negatively” charged inside as compared to impulse • Action potential: helps the transmission of an electrical impulse by making inside more “positive”

  4. NERVE IMPULSES • When the impulse reaches terminal neurotransmitters are released into synaptic cleft

  5. Effect of drugs on the nervous system • Drug: chemical compound that affects the body

  6. Drugs may…. • Prevent re-uptake of neurotransmitters • Over stimulation of nervous system • Mimicking neurotransmitters

  7. Sensory Receptors • Neuron that detects stimuli.

  8. Mechanoreceptors • Detect pressure and movement • Sense: Hearing and touch

  9. Thermoreceptor • Detect temperature

  10. Pain receptor • Detect tissue damage

  11. Chemoreceptors • Respond to chemicals • Sense: Smell and taste

  12. Photoreceptor • Respond to variation in light • Sense: sight

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