Nervous System

    Nervous System
    What is the function of the middle ear ossicles?
    The ossicles are mechanical lever systems that are attached to the tympanic membrane at one end and to the oval window at the other. They transmit the movements in the tympanic membrane across the middle ear and to the perilymph behind the oval “window”.
    Author: rikazzz Comment
    Nervous System
    What is the purpose of the diaphragm on the bell of a stethoscope? To:
    The bell matches the impedance of the air and the skin by resonating with the sounds coming from the body.
    Author: rikazzz Comment
    Nervous System
    Which of the three structures listed below constitute a nerve cell?
    Neuroglia and ganglion are not part of a neuron. Efferent fibre is an ambiguous term that may refer to an axon or to a motor neuron.
    Author: rikazzz Comment
    Nervous System
    In what respect does “grey matter” differ from “white matter”?
    The myelin that surrounds the axons of neurons gives them a white appearance.
    Author: rikazzz Comment
    Nervous System
    Which of the following statements about the structure of the eye is INCORRECT?
    The black pupil is the central hole in the pupillary muscles of the iris through which light passes to strike the retina. It appears black as normally no light exits the pupil.
    Author: rikazzz Comment
    Nervous System
    What is the name of the structure that allows nerve fibres from the medial aspect of each retina to join fibres from the lateral aspect of the retina of the other eye?
    The optic chiasma is where the fibres cross over.
    Author: rikazzz Comment
    Nervous System
    The unit of sound level is the decibel (dB) and the unit of sound frequency is the hertz (Hz). Which sounds below, characterised by their sound level and frequency, would sound loudest to the human ear?
    60 dB is approximately the sound level of normal conversation, while the human ear is very sensitive to a frequency of 1000 Hz. 20 Hz is below our hearing range, while 21,000 Hz is beyond our range. 10 dB is very quiet compared to 60 dB.
    Author: rikazzz Comment
    Nervous System
    Which statement is true of a multipolar neuron?
    The many dendrites give the “multi-” part of the name of this type of neuron. Sensory neurones are unipolar.
    Author: rikazzz Comment
    Nervous System
    Which neurotransmitter do all motor neurons release at their synapses?
    All somatic motor neurons release acetylcholine at their synapses with skeletal muscle fibres.
    Author: rikazzz Comment
    Nervous System
    What are the “ascending tracts” of the spinal cord and what do they do?
    Tracts means white matter as axons is myelinated which makes them look white. Ascending means that the nerve impulses are going from the body to brain, that is, they are carrying sensory input to the brain.
    Author: rikazzz Comment