Anatomy and Physiology

    Chemistry for Physiology
    Compounds may be described by which of the following sentences?
    Choice B refers only to covalent compounds.
    Author: rikazzz Comment
    Biomechanics
    A person who is standing on both of their feet is “stable” when:
    When the imaginary line joining the Earth’s centre with the person’s centre of gravity passes through the area of a person’s base of support, they are stable. That is, they won’t overbalance and tip over.
    Author: rikazzz Comment
    Nervous System
    Which part of the retina has the greatest sensitivity to light?
    The fovea centralis is at the centre of the macula lutea. The optic disc is insensitive to light.
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    Cells and Tissues
    Cell membranes can maintain a difference in electrical charge between the interior of the cell and the extracellular fluid. What is this charge difference called?
    The inside of a cell is negative, while the exterior side of the membrane is positive. This difference in charge constitutes a difference in electrical potential (or voltage), known as the resting membrane potential. An action potential is generated when the membrane is stimulated and the potential reversed.
    Author: rikazzz Comment
    Chemistry for Physiology
    What is the smallest particle of a non-metal element known as?
    An atom is the smallest particle of any element – not just non-metals!
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    Cardiovascular System
    An increase in parasympathetic impulses along the vagus nerve causes:
    Parasympathetic stimulation causes a decrease in BP as heart rate and force of contraction are decreased. Dilation and constriction of blood vessels are controlled by the sympathetic nervous system.
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    Renal System
    From which arteriole does blood enter the peritubular capillaries of the nephron?
    Efferent arteriole leaves the glomerulus and enters the peritubular capillaries.
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    Nervous System
    Sensory receptors convert stimuli into what?
    When a neuron is stimulated by a sensory stimulus, a graded potential is produced.
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    Cardiovascular System
    Which situation below would make the heart beat faster?
    Increased sympathetic stimulation causes an increase in heart rate. The vagus nerve carries only parasympathetic impulses.
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    Gastrointestinal System
    Which type of cell produces hydrochloric acid?
    The parietal cells of gastric glands produce hydrochloric acid. (Zymogenic cells are the same as chief cells; they produce pepsinogen.)
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