Anatomy and Physiology

    Nervous System
    Most sensory neurones may be described as which of the following?
    Sensory neurons are unipolar. And their cell bodies are outside the CNS in the dorsal root ganglia.
    Author: rikazzz Comment
    Gastrointestinal System
    Emulsification is the process where:
    Producing smaller droplets of fat increases the surface area available for lipase and allows digestion to proceed faster.
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    Cardiovascular System
    Which of the following statements about pressure is true?
    Increasing the area of contact between a mass and the floor will decrease the pressure being exerted.
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    Cells and Tissues
    Which of the following is the correct combination of the components for the nucleic acid RNA?
    RNA must have the sugar ribose. Thymine exists in DNA but not RNA, where it is replaced with uracil.
    Author: rikazzz Comment
    Reproductive System
    Where does fertilisation of the ovum normally occur?
    The sperm meet the ovum in the ampulla of the fallopian tube (=uterine tube) where fertilisation takes place, facilitated by the secretions of the peg cells.
    Author: rikazzz Comment
    Nervous System
    How does the ear distinguish between sounds of different frequency?
    Sounds of the highest frequencies travelling through the endolymph displace that part of the basilar membrane that is close to the oval window. As frequency gets lower, progressively more distant sections of the basilar membrane are displaced. Choice B is correct but not as good an answer as choice D.
    Author: rikazzz Comment
    Respiratory System
    Deoxygenated blood entering the alveoli has dissolved oxygen with partial pressure of 40 mmHg, while alveolar air has oxygen present at a partial pressure of 90 mmHg. What will be the partial pressure of dissolved oxygen in blood that leaves the lungs?
    Oxygen will continue to move from the alveoli into the blood while a pressure gradient (a concentration gradient) exists.
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    Endocrine System
    What is one mechanism of hormone action?
    Some hormones (corticosteroids) determine which genes are transcribed in the nucleus.
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    Gastrointestinal System
    Which of the following terms is used to describe the changing of large food molecules into smaller molecules?
    Hydrolysis refers to the splitting (lysis) of large molecules into smaller ones using water (hydro).
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    Chemistry for Physiology
    Which reaction below demonstrates the action of the bicarbonate buffer?
    A buffer must destroy acid, so choices C and D, in which acid is “created”, are wrong. A chemical reaction must have equal numbers of H atoms on each side of the arrow, but choice B has 5H on one side and 3H on the other.
    Author: rikazzz Comment