Anatomy and Physiology

    Chemistry for Physiology
    When in solution, an acidic drug also exists as its salt. What feature does the salt of a drug have that may not be shared by the acid form of the drug?
    The salt of the drug, being ionised, is more soluble in water (a polar liquid) than is the drug molecule.
    Author: rikazzz Comment
    Endocrine System
    What hormone does the thyroid produce?
    Thyroxine (or tetraiodothyronine) is converted to triiodothyronine in target tissues.
    Author: rikazzz Comment
    Skeleton and Joints
    Which term below refers to a depression in a bone?
    Fossa is a depression reminiscent of a (small) dinner table plate. A tuberosity is a roughening on a bone surface. The other two choices are projections above a bone surface.
    Author: rikazzz Comment
    Electricity
    In order for the “on-off” switch and the fuse to operate as intended in AC circuits, which wires must they be placed on?
    The active wire is connected to the electricity grid and to the electrical device. So the on switch must be able to interrupt this supply. The fuse also is on the active wire so that it “melts” if the current passing through it is above its set value.
    Author: rikazzz Comment
    Respiratory System
    The act of breathing in (inhalation) involves expanding the thoracic cage. What does this cause the lung volume to do?
    Expanding the thoracic cage increases lung volume which (by Boyle’s law) decreases the air pressure in the lungs.
    Author: rikazzz Comment
    Endocrine System
    Which structure produces the hormones ADH and oxytocin?
    ADH and OT are produced in the hypothalamus and are then transported to the posterior pituitary for release.
    Author: rikazzz Comment
    Cardiovascular System
    What is the pulse that we feel at the anterior medial part of the elbow (when in anatomical position) called?
    Because at this position, we are palpating the brachial artery.
    Author: rikazzz Comment
    Muscles
    Which molecule in a muscle cell has a cross-bridge that attaches to a binding site to effect the shortening of the cell?
    Myosin (the thick filament) has a cross-bridge that attaches to a binding site on actin (the thin filament) when it is exposed.
    Author: rikazzz Comment
    Cardiovascular System
    Which cell in the list below is the MOST common white blood cell?
    Neutrophils (also called polymorphonuclear leucocytes) constitute between 50% and 70% of WBC.
    Author: rikazzz Comment
    Cardiovascular System
    What will cause the sino-atrial (SA) node to depolarize more frequently?
    Norepinephrine (released by the sympathetic nervous system) acting on the SA node increases heart rate and blood pressure. Parasympathetic stimulation along the vagus nerve decreases heart activity.
    Author: rikazzz Comment