Anatomy and Physiology

    Respiratory System
    The lists below include of four respiratory tract structures. Which list has them in the order that inhaled air would pass through them on the way to the lungs?
    The conchae are adjacent to the external nares; the pharynx is superior to the larynx and the larynx is at the entrance to the trachea.
    Author: rikazzz Comment
    Chemistry for Physiology
    What can be said about a solution that conducts electricity?
    Dissolved ions must be present for electrical conduction to occur.
    Author: rikazzz Comment
    Biomechanics
    Choose the INCORRECT statement from the four below:
    Weight is a force, while pressure is a force divided by the area upon which it is acting.
    Author: rikazzz Comment
    Ionising Radiation
    In an experiment to determine the half-life of a particular radionuclide, measurements of the mass of that nuclide are made. If masses of 8 μg and 2 μg are recorded at intervals of 8 days apart, what is the half-life of the nuclide?
    If we start with 8 μg of a radionuclide and when it decays, it becomes another nuclide, and then after one half-life, there will be 4 μg remaining, and after another half-life, there will be 2 μg. Hence two half-lives have elapsed during the 8-day period. This means one half life is 8 ÷ 2 = 4 days.
    Author: rikazzz Comment
    Respiratory System
    Inhalation of air into the lungs is correctly described by which of the following?
    Inhalation is an active process that requires muscles to contract. Their contraction increases lung volume which produces a pressure in the lungs that is lower than atmospheric pressure (a negative pressure).
    Author: rikazzz Comment
    Ionising Radiation
    Which of the following is a correct use of the unit known as the “electron volt” (eV)?
    The eV is a unit of energy (not radioactivity). It is equal to 1.9 × 10−16 joules of energy. Visible photons have energy of 1.5 eV or less.
    Author: rikazzz Comment
    Cardiovascular System
    What is the main function of mitral valve?
    During ventricular systole, blood should flow through the aortic valve into the aorta and not back into the left atrium. The mitral valve prevents blood going back into the left atrium.
    Author: rikazzz Comment
    Skeleton and Joints
    Which of the following bone markings forms part of an articulation?
    The lateral condyle of the femur articulates with the lateral facet of the superior articular surface of the tibia, in the knee joint.
    Author: rikazzz Comment
    Gastrointestinal System
    Which fluid within the body is likely to have the HIGHEST pH?
    Highest pH means the most alkaline. Blood pH is about 7.4, which is less than in the intestines. The proximal part of the duodenum will receive acidic chyme from the stomach, so its pH will be lowered by that. A is the best choice.
    Author: rikazzz Comment
    Cells and Tissues
    The process by which information is read from DNA, encoded and transported outside the nucleus is known as:
    To “transcribe” is to record the information from a source and to record it at another place (onto mRNA). Then messenger RNA moves out of the nucleus.
    Author: rikazzz Comment