Nervous System

    Nervous System
    Glaucoma is an eye disease which affects vision. It is caused by:
    Glaucoma results from higher than healthy intraocular pressure in the eyeball.
    Author: rikazzz Comment
    Nervous System
    Which best describes a nerve?
    A nerve is a bundle of axons of individual neurons. Hence it does not contain nerve cell bodies. A nerve does include the Schwann cells around axons, BV and CT.
    Author: rikazzz Comment
    Nervous System
    What event during the action potential causes the resting membrane potential to change from about −70 mV to about +30 mV?
    It takes positive ions moving INTO the cell to change the resting potential from −70 to +30 mV. The ions are sodium.
    Author: rikazzz Comment
    Nervous System
    Which chamber or section of the ear is NOT filled with air?
    The cochlea contains liquids known as perilymph and endolymph. The Eustachian tube is usually squashed flat, but when it is opened, it contains air that is entering or leaving the middle ear.
    Author: rikazzz Comment
    Nervous System
    By which of the following pathways does sound entering the ear reach the organ of Corti?
    Sound impinges on the tympanic membrane first. The Eustachian tube and the auditory tube are the same thing and do not conduct sound – they connect the middle ear to the mouth.
    Author: rikazzz Comment
    Nervous System
    What part of the brain subconsciously provides precise timing for the movements of learned skeletal muscle contraction?
    Cerebellum subconsciously provides precise timing and appropriate patterns of learned skilled skeletal muscle contraction for smooth coordinated movements, posture and agility.
    Author: rikazzz Comment
    Nervous System
    What is the function of a spinal nerve?
    Spinal nerves arise from the combination of a dorsal root that carries sensory information and a ventral root that carries motor information.
    Author: rikazzz Comment
    Nervous System
    Which part of the nervous system prepares you for vigorous activity (“to fight or flee”)?
    The sympathetic NS “stirs you up” for vigorous activity.
    Author: rikazzz Comment
    Nervous System
    The deterioration of sight with age is known by which term?
    “Presby-” means old (or elder): presbyopia = old-age vision; presbycusis = old-age hearing.
    Author: rikazzz Comment
    Nervous System
    Consider the following pairs of terms. Which pair has a term that refers to a part of the nervous system that carries sensory information to the brain and a term that refers to a part that carries motor commands to the peripheral tissues?
    Afferent division carries sensory info to the brain, while efferent refers to motor info leaving the brain.
    Author: rikazzz Comment