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Biology

GCSE · AQA

QuestionsFlashcards

Communicable Diseases
Monoclonal Antibodies
- Producing Monoclonal Antibodies
  6
- Uses of Monoclonal Antibodies
  7
Plant Disease
- Detection and Identification of Plant Diseases
  6
- Plant Defence Responses
  6

Control of Body Temperature Flashcards

All 9 cards in this deck

Which part of the brain monitors and controls body temperature?: The thermoregulatory centre.
What does the thermoregulatory centre contain, and what does it monitor?: Receptors sensitive to the temperature of the blood flowing through the brain.
How does the skin send information about temperature to the thermoregulatory centre?: Temperature receptors in the skin send nervous impulses along neurones to the thermoregulatory centre.
What three responses happen if body temperature is too low?: Blood vessels constrict (vasoconstriction), sweating stops, and skeletal muscles contract (shivering).
What two responses happen if body temperature is too high?: Blood vessels dilate (vasodilation) and sweat is produced from the sweat glands.
How does vasodilation help lower body temperature?: More blood flows near the skin surface, so more energy is transferred from the blood to the environment.
How does shivering raise body temperature?: Skeletal muscles contract, increasing respiration, which releases energy that warms the body.
True or false? During vasodilation the blood vessels move closer to the surface of the skin.: False. The vessels do not move; they widen so more blood flows near the surface.
True or false? Sweating cools the body because energy is transferred from the skin as the sweat evaporates.: True. Evaporation of the sweat transfers energy from the skin to the environment, so less sweat means less cooling.