Homeostasis (Edexcel GCSE Biology): Quizzes
📚Quizzes
Practise the questions
12 questions from this quiz
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Practise the questions
12 questions from this quiz
What is homeostasis?
What is homeostasis?
Maintaining constant internal environment
What is the optimal body temperature for enzymes to function in humans?
What is the optimal body temperature for enzymes to function in humans?
Around 37°C
What happens to enzymes if body temperature rises above 40°C?
What happens to enzymes if body temperature rises above 40°C?
They denature and lose their function
What happens to enzyme activity when body temperature falls too low?
What happens to enzyme activity when body temperature falls too low?
Activity slows, less energy produced
What is vasodilation?
What is vasodilation?
Blood vessels widen to increase heat loss
What is vasoconstriction?
What is vasoconstriction?
Blood vessels narrow to reduce heat loss
Where is the dermis located?
Where is the dermis located?
Inner layer beneath the epidermis
How does sweat cool the body?
How does sweat cool the body?
Evaporation removes heat from the body
What is the role of the hypothalamus in thermoregulation?
What is the role of the hypothalamus in thermoregulation?
Acts as the thermoregulatory centre
What is osmoregulation?
What is osmoregulation?
Control of water & mineral ions in blood
What happens if water concentration outside cells is too high?
What happens if water concentration outside cells is too high?
Water moves in; cells swell & may burst
What is the function of ADH (Antidiuretic Hormone)?
What is the function of ADH (Antidiuretic Hormone)?
Controls water reabsorption in kidneys