Assignment 07: Chapter 7 - Nervous System
What is the first event of an action potential?
Sodium gates open and the membrane depolarizes.
What is the most abundant glial cell in the central nervous system (CNS)?
astrocytes
Which of the following conditions would result from damage to the cerebellum?
ataxia
What part of the central nervous system (CNS) gives rise to sympathetic nerves?
thoracic and lumbar regions of the spinal cord
Which of these is a sympathetic effect?
Blood vessels constrict.
Why is white matter "white"?
It contains a high concentration of myelin.
What statement describes the integrative function of the nervous system?
The central nervous system (CNS) evaluates sensory input and determines if a response is needed.
Which statement describes a function of the spinal cord?
The spinal cord sends sensory information to the brain and carries motor signals from the brain to motor neurons
What produces cerebrospinal fluid (CSF)?
choroid plexus
What part of a neuron receives signals and sends a message to the cell body?
dendrite
Which of these is an effect of the parasympathetic nervous system?
increases peristalsis within the stomach and small intestines
What part of the brain do we use when initiating skeletal muscle movement?
primary motor area
Which of these lists the components of a reflex arc in the correct sequence?
receptor; afferent neuron; control center; efferent neuron; effector
Which of the following neurons is classified as a unipolar neuron?
sensory neuron
Anesthetics work by blocking the movement of an ion into an axon, thus preventing an action potential from being generated. Which ion is being blocked?
sodium
What ion depolarizes the membrane when it diffuses into the axon of a neuron?
sodium
