The Neuron

Name_______________________________ The Neuron Use the words from the list below to label the following diagram of a neuron in the lines provided. Word Bank Axon – Cell Body – Dendrites – Myelin Node of Ranvier – Nucleus – Synaptic Terminal Below is a list of different parts of a neuron. On the lines following each word, write out what that structure does for the neuron (its function) and where it is located on the neuron. Axon:_____________________________________________________________ ____ ___________________________________________________________ Cell Body:____________________________________________________________ ___________________________________________________________ Dendrites:__________________________________________________________ __ ___________________________________________________________ Myelin:____________________________________________________________ ___ ___________________________________________________________ Node of Ranvier:______________________________________________________ ___________________________________________________________ Nucleus:___________________________________________________________ ___ ___________________________________________________________ Synaptic Terminal:____________________________________________________ Quiz: The Neuron 1. The skeletal muscles are controlled by the brain stem autonomic nervous system somatic nervous system cerebellum 2. What is the function of the oligodendrocytes? create myelin layer clean up cellular debris supply blood and nutrients alert the body to an infection 3.What cells are responsible for communication within the nervous system? glial neurons myelins terminals 4. What ions are necessary for a nerve impulse to occur? carbon and sodium oxygen and carbon potassium and sodium hydrogen and potassium 5. Gaps between the myelin sheath along an axon are called: dendrites chromatophilic substance astrocytes nodes of ranvier 6. Which cell connects neurons to blood vessels? astrocyte oligodendrocyte glial myelin 7. The chemical that moves from the axon of one neuron across a gap to the dendrite of another is a(n): gray matter theshold stimulant sodium neurotransmitter 8. White matter appears white due to: no blood supply myelin lack of nuclei electrical charges 9. A threshold stimulus results in the creation of a(n): wave node of ranvier neurotransmitter action potential 10. Reflexes (such as the knee-jerk reflex) occur when impulses travel from the muscle to the ____ and then back to the muscle. brain spinal cord dendrite axon