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5 Written questions

5 Matching questions

  1. Heat Stroke
  2. Phospholipid Bilayer
  3. Hypothalamic Temperature Control (Hot)
  4. Shell Temperature
  5. Carbohydrates (Cell Membrane)
  1. a Prolonged heat exposure with high humidity. Body gains heat by radiation and convection while evaporative cooling is retarded. Can lead to convulsions, coma, and death.
  2. b These cells are found only on outer half of the lipid bilayer as a thin sugar coating, called the cell coat or glycocalyx. Cell communication: receptors for binding hormones, cell adhesion (cohesive tissue), immune reaction.
  3. c * Vasodilatation of dermal blood vessels and increased blood flow to the skin (8 fold reduction in heat)
    * Sweat (removes 10 times basal metabolic rate heat)
    * Heat production inhibited
  4. d Skin and oral cavity temperature. Fluctuates with ambient temperature. Slightly lower than rectal temperatures. Varies between 98 °F and 98.6 °F.
  5. e Low permeability to water-soluble substances (e.g. ions, glucose, and amino acids), but permeable to lipid-soluble substances (e.g. fatty acids, oxygen, and carbon dioxide).

5 Multiple choice questions

  1. Depends on the speed of heat transfer from body core to skin to ambient environment.
  2. * Bacterial infection
    * Macrophage pyrogens (10 minutes)
    * Macrophages secrete an lymphokine, interleukine-1 (pyrogen) → stimulates hypothalamus → prostaglandin E1 (PGE-1) → raises set point to 102 °F
    * Endotoxins from bacteria (several hours)
    * Aspirin, etc. inhibit PGE-1 synthesis (antipyretic)
  3. Central Nervous System and Peripheral Nervous System
  4. A process in which the body senses a change and activates a mechanism that reverses that change; its function is to maintain stable internal environmental conditions; closed loop system.
  5. * Isolates the cell
    * Regulates the intracellular and extracellular ionic environment
    * Comprised of a phospholipid bilayer

5 True/False questions

  1. Primary Secretion* Bacterial infection
    * Macrophage pyrogens (10 minutes)
    * Macrophages secrete an lymphokine, interleukine-1 (pyrogen) → stimulates hypothalamus → prostaglandin E1 (PGE-1) → raises set point to 102 °F
    * Endotoxins from bacteria (several hours)
    * Aspirin, etc. inhibit PGE-1 synthesis (antipyretic)

          

  2. Chemical Thermogenesis Long-Term EffectLong-term mechanism for generating body heat. Sympathetic nerves produce epinephrine and nor epinephrine and release into blood, and the thyroid releases thyroxin. Increased cellular metabolism and metabolic rate.

          

  3. Fever (Pyrexia)Tissue that surrounds and supports neurons in the central nervous system; support, protect, and nourish the neurons.

          

  4. Conduction18% of heat loss. The direct transfer of body heat through direct contact. 3% lost from body to other objects, 15% heat lost to air. This can occur in either direction depending on the ambient temperature.

          

  5. (Skin as) InsulatorWhile blood is kept below adipose tissue, a poor conductor of heat, skin is {this}.

          

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