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Nervous system Answer Key

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Central Nervous System
#1 The central nervous system consists of what two structures? brain and spinal cord
#2 Astrocytes, oiligodendrocytes, microglia and ependymal cells are all types of ___________ in the CNS. neuroglia cells
#3 A histological examination of the brain during an autopsy reveals an extremely high number of microglial cells in an area that had suffered recent trauma? What do these cells signify? phagocytic activity to remove dead cells and infectious organisms present
#4 Gaps in myelin sheath are called. Nodes of Ranvier
#5 In the spinal cord, where do we find CSF? central canal and subarachnoid space
How do nerves work?
#1 What are the two divisions of the PNS? autonomic and somatic
#2 Motor neurons of the efferent division of the PNS carry _____________. instructions from the CNS to muscles, glands, and adipose tissue
#3 A child is brought to the clinic with a high temperature. The doctor states that the child's meninges are inflamed. What is the probable cause? spinal meningitis
#4 Interconnecting neurons and communication between cerebral hemispheres occurs through what structure? corpus callosum
#5 An involuntary muscular contraction in response to a stimulus is known as _________. reflex
Nervous Conditions
#1 Following a train accident a woman with an obvious head injury, is observed stumbling abou the scene. An inability to walk properly and loss of balance are obvious. Which region of the brain was injured? cerebellum
#2 This neurotransmitter is also a hormone. In the PNS it plays a role in the 'fight or flight' response. nerepinephrine
#3 This neurotransmitter produces a feeling of euphoria. dopamine
#4 The outer most layer of the meninges dura mater
#5 Voluntary control of skeletal muscles is provided by the ____________. somatic nercous system
Neurons, Nerves and Such
#1 Neurons are classified on the basis of their function as motor, sensory, and association
#2 Nerve impulses start at the dendrite then travels through the cell body to the ___________. axon
#3 What are the primary functions of the nervous system. monitoring internal and external environments; integrating sensory information; coordinating voluntary and involuntary responses
#4 The membranes located between bone and the soft tissue of the nervous system. meninges
#5 Neurons are classified on the basis of their structure as ____________. unipolar, bipolar, multipolar
Nerves and Messages
#1 A part of a synapse where intercellular communications between neurons occur. synaptic terminal
#2 A simple nerve pathway that would be involved with involuntary actions. reflex arc
#3 The autonomic nervous system is divided into what two divisions? sympathetic and parasympathetic
#4 Nerves of the ______________ nervous system receive and process sensory input from the skin, muscles, tendons, joints, eyes, etc. somatic
#5 Nerves of the _______________ nervous system carry impulses from the CNS to glands, various smooth muscles, cardiac muscle and various membranes. autonomic
Final Question
Describe the cause of Myesthenia gravis.