The function of the nervous system is Organization of the Nervous System Nervous System Worksheet The nervous system has two major divisions: 1. 2. . 2. Nerve tissue cells List the two basic types of the cells that make up nerve tissue, and their functions. 1.. 3. Neuron Structure Label dendrites, axon, bouton, Schwann cells, myelin sheath, Nodes of Ranvier What does each structure do? What's it's purpose? What is saltutory conduction? Look up in text or on internet. Cell body Three types of neurons 1. 2. Nervous System (CNS) - consists of the brain and spinal cord. Nervous System (PNS)-nerves outside the brain and spinal cord. Cell body neurons receive stimuli (messages) and transmit them to the CNS. neurons take impulses away from the CNS to an effector which produces a response. The effector may be a muscle or gland. neurons connect and integrate information between the first two types of neurons. They lie entirely within the CNS. Three types of neurons . . Simuta- . Recept Be able to label the parts of a spinal reflex arc like the one above, for the quiz or exam. Sensory receptors - where are they and what are they? Give some examples. Effectors - where are they and what are they? Give some examples. . Skin- The Nerve Impulse A nerve impulse is actually a wave of chemical and electrical change that travels along a nerve. The name of this wave of change is called a(n)__ . The Synapse When a nerve impulse passes between two neurons, it must be transmitted across a gap which, together with the ends of the two neurons, is called a Sensory neuron Motor neuron -Spinal cord cross-section -integration et -intern When the nerve impulse reaches the end of the first neuron, chemicals stored in vesicles are released into the gap by exocytosis. These chemicals are called The chemicals then flow across the gap and bind to membrane receptors in the second neuron, triggering a nerve impulse in the second neuron. Bouton After the impulse crosses the synapse, the chemicals are either broken down by enzymes or reabsorbed by the first neuron in a process called Two examples of neurotransmitters are and neuron Complete the diagram below, filling in the blanks and drawing in vesicles, neurotransmitters, exocytosis, and neurotransmitter receptors. What is the space between the two neurons called? How are neurotransmitters removed from the synapse? Neuron 1 The Synapse Neuron 2 Cell body neuron