Anatomy and Physiology Answer Key

G an enzyme to detect the presence or concentration

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Unformatted text preview: e reduced by (a and b any two of): • Sweating (cooling by evaporation) • Reducing activity • Behavioural mechanisms such as removing clothing or seeking shade • Increasing blood flow to skin (leads to increased radiation from the skin surface). 2. (a) Hypothalamus: Monitors temperature changes in the body and coordinates appropriate responses to counteract the changes. (b) Skin: Detects changes in skin temperature and relays the information to the hypothalamus. In response to input from the hypothalamus, muscles and capillaries in the skin act as effectors to bring about an appropriate thermoregulatory response. (c) Nervous input to effectors: (from hypothalamus) brings about (through stimulation of muscles) an appropriate thermoregulatory response (e.g. raising hairs, constricting blood vessels). (d) Hormones: Mediate a change in metabolic rate through their general action on body cells (epinephrine and thyroxine increase metabolic rate). Endoscopy allows exploration of organs and tissues without extensive surgery. This is useful for diagnosing the exact nature and location of problems (e.g. blocked fallopian tubes or roughened areas of cartilage in a knee joint). Explanatory note: Once a problem is diagnosed, surgery can be performed if necessary, using very small incisions and specialized surgical tools that cause minimal tissue damage (endoscopes are used for viewing during the surgery). 5. Thermoregulation (page 45) Whereas X-rays pass through a person and expose photographic film, radionuclide scanning involves the introduction of the radionuclide into the body where it is differentially absorbed by different tissues. These tissues then emit radiation which is detected by a gamma camera. 4. The Integumentary System (page 43) 1. (a) and (b) any of in any order: – Thermoregulation: cooling by sweating, vasodilation, and hair flattening, conserving heat by vasoconstriction and hair erection. – Skin contains sensory receptors to enable appropriate respo...
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This document was uploaded on 01/28/2014.

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