Nervous System

    Nervous System
    What is found between the arachnoid and pia mater?
    Between the arachnoid and pia mater is the subarachnoid space and this is filled with cerebrospinal fluid.
    Author: rikazzz Comment
    Nervous System
    Which one of the following is NOT a function of the cerebral spinal fluid?
    The CSF does not produce hormones.
    Author: rikazzz Comment
    Nervous System
    What is the function of the tensor tympani and stapedius muscles in the middle ear?
    The tensor tympani limits the amount of movement in the tympanic membrane. The stapedius reduces the movement of the stapes against the oval window.
    Author: rikazzz Comment
    Nervous System
    Which one of the following lists of anatomical features is in the correct order of the path taken by sound energy as it is transmitted through the ear?
    Tympanic membrane comes first, then any of the ossicles and then the oval window and cochlear fluid.
    Author: rikazzz Comment
    Nervous System
    Why does the eye have a blind spot?
    There is no retina at the blind spot (or optic disc) as it is the exit point for the axons of the ganglion cells. These axons form the optic nerve and the optic disc is also the entry point for the retinal artery and vein. Choice A is incorrectly describing the fovea centralis.
    Author: rikazzz Comment
    Nervous System
    Which is an example of a cholinergic receptor?
    A nicotinic receptor binds acetylcholine so is called a “cholinergic” receptor.
    Author: rikazzz Comment
    Nervous System
    Which of the following is NOT a meninx that surrounds the brain?
    There are three meninges, but there is no such thing as epidural mater.
    Author: rikazzz Comment
    Nervous System
    What is the name of the narrowest aperture of the eye through which light must pass so that we may see?
    The pupil is the “black” circle in the middle of the colourful iris. The diameter of the pupil may increase and decrease as the iris dilates and constricts.
    Author: rikazzz Comment
    Nervous System
    What is the space between a neuron and the following neuron, muscle or gland that it stimulates called?
    The synaptic cleft is the space over which an incoming nerve impulse is transmitted by a molecule called a neurotransmitter.
    Author: rikazzz Comment
    Nervous System
    A difference in the amount and type of ions between the two sides of a plasma membrane or a charge difference that occurs when ions move along a membrane is called an “electrical potential”. What does the term “action potential” refer to?
    The influx of sodium ions followed by the efflux of potassium ions describes the action potential. Choice A describes the “resting potential”.
    Author: rikazzz Comment