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Synapses and Reflex Action

Synapses and Reflex Action. Synapse. Neurons are not continuous Synapse is “The junction across which a nerve impulse passes from an axon terminal to a neuron, muscle cell or gland” Two types of Synapses: Excitatory Inhibitory. Reflex Action. In Groups of 3.

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Synapses and Reflex Action

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  1. Synapses and Reflex Action

  2. Synapse • Neurons are not continuous • Synapse is “The junction across which a nerve impulse passes from an axon terminal to a neuron, muscle cell or gland” • Two types of Synapses: • Excitatory • Inhibitory

  3. Reflex Action

  4. In Groups of 3. • 2 people face each other, looking at each other • The third person stands off to the side. • Anytime from 1 Sec till 10 Seconds the third person will clap • Two people record what the other does.

  5. What is a Reflex action??

  6. Reflex actions • “An action that is performed without conscious thought as a response to a stimulus” • The signals from the receptors do not travel to the brain, instead they travel through what we call a Reflex Arc. • Spinal reflexes or Brain Reflexes • Stimulus – receptor – sensory neuron – association neuron – motor neuron – Effector - Response

  7. Try These?? • Draw one reflex arc for your body’s response to touching a hot object. • Draw one reflex arc for your body’s response to standing on something sharp. • Draw one reflex arc showing your body’s response to a loud noise.

  8. Stimulus Response Model.

  9. How does our body react to normal stimulus?? • In a reflex: • Stimulus – Receptor – Messenger – Association neuron – Messenger – Effector - Response • In a normal response: • Stimulus – Receptor – Messenger - Coordinating system - Messenger – Effector - Response

  10. Try These?? • Draw a stimulus response model for how the body would handle a change in temperature? • Draw a stimulus response model for how the body may respond to a drop in water concentration? • Draw a stimulus response model for how the body may respond to a drop in sugar levels? • Hypothalamus (links our nervous and endocrine systems): • Control Metabolic Activities • Water Balance • Sugar Metabolism • Body Temperature • Hormone Secretion

  11. Nervous System Review

  12. Name the Two parts of the nervous system, and provide there acronyms? • Draw and Label the Key Structures of a Motor Neuron? • What are the two components of the CNS? • What are the two types of matter that make up our CNS? • How many Neurons does our brain contain?

  13. Name three parts of the Brain? • How much space does the Cerebrum take in our brain? • What does PNS stand for and what are the two components? • What are two examples of Receptors? • What function does our Somatic Nervous System play? • What are the two types of Photoreceptors found in the eye?

  14. Apart from sound, what other function does our ear play in our body coordination? • What are 3 examples of stimuli our skin can detect?

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