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Homeostasis
is the condition of equilibirum in the body's internal environment due to the constant interaction of the body's many regulatory processes.
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Feedback Systems
is a cycle of events in which the status of a body condition is monitored, evaluated, changed, remonitored, reevaluated, and so on.
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Noninvasive Diagnostic Techniques
- Palpation
- Auscultation
- Percussion
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Palpation
the examiner feels body surfaces with the hands.
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Auscultation
examiner listens to body sounds to evaluate the functioning of certain organs, often using a stethoscope to amplify the sounds.
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Percussion
examiner taps on the body surface with the fingertips and listens to the resulting echo.
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Autopsy
is a postmortem examination of the body and dissection of its internal organs to confirm or determine the cause of death.
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Diagnosis of Disease
is the science and skill of distinguishing one disorder from another.
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Medical History
consists of collecting information about events that might be related to a patients illness.
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Physical Examination
is an orderly evaluation of the body and its functions.
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Medical Imaging
refers to techniques and procedures used to create images of the human body.
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Radiography
A single barrage of x-rays passes through the body, producing an image of interior structures on x-ray-sensitive film.
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Magnetic Resonance (MRI)
The body is exposed to a high-energy magnetic field, which causes protons in body fluids and tissues to arrange themselves in relation to the field.
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Computed Tomography (CT)
Computer assisted radiography in which x-ray beam traces an arc at multiple angles around a section of the body.
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Ultrasound Scanning
High-frequency sound waves produced by a handheld wand reflect off body tissues and are detected by the same instrument.
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Positron Emission Tomography (PET)
A substance that emits positrons is injected into the body, where it is taken up by tissues.
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Radionuclide Scanning
A radionuclide is introduced intravenously into the body and carried by the blood to the tissue to be imaged.
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Endoscopy
The visual examination of the inside of body organs or cavities using a lighted instrument with lenses called an endoscope.
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Harmful and Beneifical Effects of Radiation
- Break apart molecules that pose threats to the human body.
- Can cause lung cancer.
- Use in medical imaging.
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Tracers
Radioisotopes used to follow the movement of certain substances through the body.
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Free Radicals and Their Effects on Health
Cancer, athersclerosis, Alzheimer disease, emphysema, diabetes
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Antioxidants
Substances that inactivate oxygen derived free radicals.
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Fatty Acids in Health and Disease.
p48
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Essential Fatty Acids (EFA)
Essential to human health and cannot be produced by the body.
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