Nervous System

    Nervous System
    Visual stimuli travel from the eyes to the part of the brain that interprets them via the “visual pathway”. Which of the following list of structures is the pathway in correct order from the eyes?
    The optic nerves leave the eyes and the signal eventually reaches the primary visual cortex in the occipital lobe.
    Author: rikazzz Comment
    Nervous System
    What would happen if a neuron lost its myelin sheath?
    The myelin sheath prevents sodium ions from leaking back into the intracellular fluid; hence, they can travel with minimum diminution to the next node to trigger the opening of abundant voltage-gated sodium channels.
    Author: rikazzz Comment
    Nervous System
    The central sulcus separates gyri involved with which two major functions?
    Motor function resides in the precentral gyrus, while sensory function resides in the postcentral gyrus.
    Author: rikazzz Comment
    Nervous System
    What is an “action potential”? It is:
    The action potential is the name given to the change in voltage of the inside of the cell from −70 to +30 and back to −70 mV again. This voltage change propagates along the axon.
    Author: rikazzz Comment
    Nervous System
    Which of the following statements is true of neuroglia?
    Neuroglia refers to several types of cells of the nervous system that are not neurones. Some of them form the myelin sheath.
    Author: rikazzz Comment
    Nervous System
    The action potential occurs when one of the following events occurs. Which one?
    Sodium rushing in following by potassium rushing out produces the action potential.
    Author: rikazzz Comment
    Nervous System
    In the peripheral nervous system, which cells form the myelin sheath?
    Schwann cells surround the axon to form the myelin sheath in peripheral neurones. Oligodendrocytes perform a similar function for neurones in the CNS.
    Author: rikazzz Comment
    Nervous System
    Which of the following is true of parasympathetic neurons?
    All parasympathetic neurons release ACh as a neurotransmitter. Choices A and D are true of the sympathetic division.
    Author: rikazzz Comment
    Nervous System
    What are the three meninges and two named “spaces” that surround the brain, in order from superficial to deep (outermost to innermost)?
    The dura mater, arachnoid mater and pia mater are the three meninges in order.
    Author: rikazzz Comment
    Nervous System
    Choose the correct statement about the eye:
    At the fovea the bipolar and ganglion cells don’t cover the cone cells so light can strike the cones directly. Bipolar, ganglion, rod and cone cells occur in the retina, not the choroid.
    Author: rikazzz Comment