The Nervous System

Neuron Labeling: Label this neuron by using the following terms: Axon, Dendrite, Cell body, Nucleus, Schwann cell, Node of Ranvier Axon Dendrite Cell body Nucleus Node of Ranvier Schwann cell Which of the following is NOT a function of the nervous system? Coordinating all body functions Responding to stimuli Maintaining homeostasis All of these are functions of the nervous system Neuroglia Matching: Match each type of neuroglia with its correct function below. Microglia Carries out phagocytosis of bacteria and other cell debris Oligodendrocyte Provides the insulating layers of myelin around axons Astrocyte Lies between neurons and blood vessels; regulates nutrient and ion concentrations within tissues Ependymal cell Forms an epithelial-like membrane that covers specialized brain parts and encloses spaces Which type of neuroglia cell helps to form scar tissue that fills in spaces of the CNS following an injury? Astrocyte Oligodendrocyte Ependymal cell Microglia Which type of neuron has two processes (one from each end) arising off the main cell body? Unipolar Bipolar Multipolar Motor Which type of neuron is found within specialized parts of the eyes, nose, and ears? Unipolar Multipolar Bipolar Motor What are specialized masses of unipolar neuron cell bodies that sit outside the brain and spinal cord? Action potentials Interneurons Nissl bodies Ganglia Neuron Matching: Match each part of a neuron with its correct function below. Dendrite Receives electrochemical messages Axon Sends information away from the neuron Cell body Contains the nucleus and Nissl bodies Neurofibril Fine thread that supports the axon Nissl body Small, membranous sac that functions in protein synthesis Nucleolus Creates ribosomes Neurilemma Cell membrane of a neuron Node of Ranvier Narrow gap in the myelin sheath between Schwann cells Schwann cell Composed of myelin and wound tightly around the axon; increases impulse speed Which type of neuron would stimulate muscles to contract or glands to secrete? Sensory Motor Interneuron Which of the following statements is true? Cell membranes are polarized in a resting state Cells have a greater concentration of sodium ions outside the cell membrane Cells have a greater concentration of potassium ions inside the cell membrane All of these statements are true Which two elements (ions) help to maintain concentration gradients within a cell? Carbon; Hydrogen Calcium; Sodium Sodium; Potassium Potassium; Calcium The point to which a membrane must be depolarized in order to initiate an action potential is known as...? threshold potential. action potential. saltatory conduction. depolarization. What is it called when a nerve impulse jumps from node to node? Action potential Threshold potential Impulse conduction Saltatory conduction On which type of axon is a nerve impulse the fastest? Myelinated Unmyelinated True or False: If a neuron responds at all, it responds completely. True False What do we call the short resting period between nerve impulses? Threshold potential Refractory period Latent period Stimuation