Anatomy and Physiology

    Ionising Radiation
    What may the term “ionising radiation” be applied to?
    The production of ions (i.e. removal of electrons from an atom) is the sign of ionising radiation. Such a change in the medium through which radiation passes is significant.
    Author: rikazzz Comment
    Biomechanics
    If a traction hanging mass is 3 kg, use Newton’s second law (or otherwise) to determine the gravitational force acting on the mass.
    Newton’s second law, F = m × a putting in the numbers gives:
    F = 3 × 10 = 30 N (a = 9.8 ms−2 but ten is close enough).
    Author: rikazzz Comment
    Electricity
    The electrocardiogram chart is a graph. What is plotted against the vertical axis?
    The ECG records the voltage produced by the heart muscle measured at the body surface.
    Author: rikazzz Comment
    Cardiovascular System
    A patient lying on a mattress of enclosed air is less likely to develop decubitis ulcers because the:
    An air mattress flexes around a patient’s body so that it conforms more closely to their curved shape. Consequently, the area of contact between the patient and the supporting surface is increased. This increased area means that the pressure will be decreased. This lower pressure is less likely to compress the blood vessels that supply the skin, and so circulation will not be cut off. Hence ulcers will be avoided.
    Author: rikazzz Comment
    Endocrine System
    By what term are hormones derived from tyrosine also known?
    Catecholamines (adrenaline, noradrenaline), dopamine and thyroid hormone are all derived from tyrosine.
    Author: rikazzz Comment
    Gastrointestinal System
    One of the following is NOT a function of the stomach. Which one?
    The stomach produces pepsinogen which activates to pepsin which begins the digestion of protein. Fat is not significantly digested in the stomach (gastric lipase initiates the digestion of milk protein).
    Author: rikazzz Comment
    The Physics of Waves: Light Waves, Sound Waves and Ultrasound
    What is the quantity that is most characteristic of an electromagnetic wave?
    Frequency of an EM wave does not change as it travels through different media, while the other three quantities do.
    Author: rikazzz Comment
    Chemistry for Physiology
    The symbol for potassium is which of the following?
    K is from kalium which is the Latin word for potassium.
    Author: rikazzz Comment
    The Physics of Waves: Light Waves, Sound Waves and Ultrasound
    Which of the following definitions of a wave is the best?
    This is the classic definition of a wave. Choices B and D are also true statements.
    Author: rikazzz Comment
    Cardiovascular System
    What is one of the determinants of the resistance to blood flow?
    Blood viscosity, largely determined by the concentration of RBC (the haematocrit), affects blood’s resistance to flow.
    Author: rikazzz Comment