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5 Written questions

5 Matching questions

  1. Convection
  2. Heat Production
  3. Rate of Heat Loss
  4. Radiation
  5. Heat Conservation
  1. a Transfer of heat from the body by currents (air and water).
  2. b Increased by thermogenesis: Shivering and Chemical.
  3. c 60% of heat loss. Molecular motion produces infra red which the body releases in all directions.
  4. d Sympathetic nerves stimulated: dermal vasoconstriction and stimulated arrector pilli.
  5. e Depends on the speed of heat transfer from body core to skin to ambient environment.

5 Multiple choice questions

  1. potassium, magnesium, phosphates, and proteins (synthesized by the cells)
  2. Painful muscle spasms due to excessive electrolyte loss in sweat.
  3. Heat Conservation and Heat Production
  4. Caused by sever electrolyte loss, hypotension, dizziness, vomiting, and fainting. Leads to decreased blood pressure, cardiac output, organ failure, and death.
  5. Fever at 108°: metabolic rate increases → more heat generated → further rise in body temp (repeat); temperature around 113° is fatal (body's proteins denature).

5 True/False questions

  1. Phospholipid BilayerLow 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).

          

  2. Aldosterone (Sweating)This kidney targeted hormone allows an acclimatized person to sweat 2-3 L/hr while minimizing the loss of salt.

          

  3. Useful Positive Feedback ExamplesLabor and delivery: baby's head on cervix → impulse to brain → stimulated pituitary → oxytocin secreted → uterine muscle contraction → more pressure on cervix (repeat); ends after placenta delivered.

    Hemostasis (blood clotting): [vessel ruptures] collagen fibers attract blood platelets → platelets attract clotting factors (Hageman factor) → prothrombin → thrombin → fibrinogen → fibrin → attracts more platelets (repeat).

    Nerve impulse: depolarization at one Na channels causes a cascade (repeat).

          

  4. Endocrine SystemSystem comprised of eight ductless glands that secrete hormones directly into the blood to regulate the target organ function.

          

  5. FlushCrisis of fever occurring at the end of febrile condition. Patient has 105 °F temperature, hypothalamus trying to maintain 98.6 °F and is still hot, leads to intense sweating and vasodilatation causing the skin to be hot.