SPLH 620 EXAM 1 (KU) QUESTIONSAND ANSWERS 100% CORRECT(SCORED A)

what is the nervous system? - ANSWER-it is a system containing a network of neurons and it controls body functions what is the CNS? - ANSWER-central nervous system - made up of brain and spinal cord, what is the PNS? - ANSWER-peripheral nervous system - sagittal plane - ANSWER-divides brain into right and left coronal plane (frontal) - ANSWER-divides brain into anterior and posterior axial (transverse) - ANSWER-divides brain into upper and lower what are the 2 basic cell types in the CNS? - ANSWER-neurons (information carriers) and glia (support cells) what do neuroglia do in general? - ANSWER-provide physical support, nutrient flow, and nerve "housekeeping" what are the 3 primary types of neuroglia and what part of the NS are they in? - ANSWER-astrocytes (CNS), oligodendroglia (CNS), and Schwann cells (PNS) what do astrocytes do? - ANSWER-- clean up local debris, including dead neurons - provide nutrients - regulate chemical composition of extra cellular fluid what do oligodendroglia do? - ANSWER-- provide support for axons - produce myelin sheath what is the makeup of myelin? - ANSWER-80% lipid and 20% protein what are the nodes of ranvier? - ANSWER-gaps in the myelin sheath what do microglia do? - ANSWER-- smallest glial cells - protects brain from invading microorganisms what do Schwann cells do? - ANSWER-- support cells - produce myelin - each cell provides myelin for one neuron what is a neuron? - ANSWER-- nerve cell - it is the information processing and transmitting element in the nervous system - 100 to 1000 billion in our nervous system what are the 3 main parts of a typical neuron and what are their functions? - ANSWER-1. dendrites- receive signals 2. cell body- integrate signals 3. axon- conduit to send signals what are the 3 neuron types? - ANSWER-sensory (afferent), motor (efferent), and interneurons