Anatomy and Physiology

    Chemistry for Physiology
    Which of the following formulae would be most likely to represent a lipid?
    Lipids consist of carbon, hydrogen and oxygen, with relatively few O compared to C. Choice C is a monosaccharide; choice A is a protein (note the nitrogen). No one should have chosen D (= calcium hydroxyapatite).
    Author: rikazzz Comment
    Endocrine System
    Which hormones are soluble in blood?
    The pituitary gland releases peptide hormones which are soluble in blood. The other choices refer to steroid hormones which are insoluble in blood. They require transport via plasma proteins.
    Author: rikazzz Comment
    Cardiovascular System
    What is the major task of red blood cells?
    Red blood cells contain much haemoglobin which binds to oxygen to transport it to the tissues.
    Author: rikazzz Comment
    Respiratory System
    Where does the actual gas exchange between inspired air and the blood in the capillaries occur? In the:
    Gas exchange occurs across the respiratory membrane of the alveoli and ducts.
    Author: rikazzz Comment
    Nervous System
    What is the depolarisation and repolarisation of a nerve cell membrane called?
    Depolarisation of the resting membrane potential leads to an action potential.
    Author: rikazzz Comment
    Reproductive System
    Ovulation in the female follows which of the listed hormonal stimuli?
    When the release of LH from anterior pituitary gland rises suddenly to three times its previous level (in response to a gradual rise in GnRH concentration to a maximum), ovulation is induced.
    Author: rikazzz Comment
    Nervous System
    What is found in the epidural space?
    The epidural space is on top of (or outside of) the dura mater. It is the space between the spinal cord and the vertebrae. It contains adipose tissue.
    Author: rikazzz Comment
    Measurement, Errors, Data and Unit Conversion
    Which of the following statements involves a nominal measurement?
    Gino’s birthplace is “named” so the information is nominal, but no other information is available.
    Author: rikazzz Comment
    The Physics of Waves: Light Waves, Sound Waves and Ultrasound
    When a Doppler ultrasound device is used to investigate the blood flow in an artery, what happens to the ultrasound when it reflects from a red blood cell?
    When ultrasound reflects from a moving object (e.g. a RBC), its frequency is changed. This is a manifestation of the “Doppler effect”. The frequency will increase if the RBC is travelling towards the ultrasound transducer. The frequency will decrease if the RBC is travelling away from the transducer. As the question does not state the direction of travel of the RBC, one cannot choose either of A or C.
    Author: rikazzz Comment
    The Physics of Waves: Light Waves, Sound Waves and Ultrasound
    Material that is unsuitable for use in a LASER lacks which of the following properties?
    A metastable excited state – that is, one that persists for longer than an excited state normally exists – is required for lasing action.
    Author: rikazzz Comment