Chapter 9 memmlers Exam Questions and Answers 100% Pass

Chapter 9 memmlers Exam Questions and Answers 100% Pass Role of the Nervous System - Answer- -Coordinates all body systems - Detects to responds stimuli - Brain & spinal cord act as switching centers - Nerves carry messages to and from centers Central nervous system (CNS): - Answer- brain and spinal cord Peripheral nervous system (PNS): - Answer- cranial and spinal nerves Somatic nervous system - Answer- voluntary; skeletal muscle Autonomic nervous system - Answer- involuntary; smooth muscle cardiac muscle, glands Which division of the nervous system exclusively controls skeletal muscles? - Answer- Somatic nervous system Neurons are - Answer- functional cells of the nervous system what fibers extend from the neuron cell body? - Answer- dendrites & axons Cell body of a neuron contains - Answer- nucleus and organelles Dendrites - Answer- carry impulses toward the cell body(receive stimulus) Axons - Answer- carry impulses away from the cell body Some axons insulate & are protected by - Answer- a fatty myelin sheath Myelin sheath - Answer- white substance covering axon; for protection & speed of impulse In the CNS, myelin sheath is called - Answer- oligodendrocytes In the PNS, myelin sheath is called - Answer- schwann cells Types of Schwann Cells - Answer- neurilemma & nodes of ranvier Neurilemma - Answer- outer layer of myelin sheath Nodes of Ranvier - Answer- gap between the cells in the myelin sheath types of neurons - Answer- sensory, motor, interneurons sensory neurons - Answer- afferent; conduct impulses to the spinal cord & brain Motor neurons - Answer- efferent; carry impulses from the CNS to muscles & glands interneurons - Answer- central or association neurons; relay information from place to place within the CNS Which fibers conduct impulses away from the cell body? - Answer- axons functions of neuroglia - Answer- support cells in CNS & can multiply what are the type of neuroglia - Answer- astrocytes, oligodendrocytes, microglia, ependymal cells astrocytes - Answer- star shaped oligodendrocyte - Answer- Form myelin sheath in CNS