Homeostasis (Edexcel GCSE Biology Combined Science): Flashcards
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Homeostasis definition
Homeostasis definition
Maintenance of constant internal environment in the body
Optimal human body temp
Optimal human body temp
Around 37°C
Effect on enzymes above 40°C
Effect on enzymes above 40°C
Denature - shape changes, can't catalyse reactions
Thermoregulation definition
Thermoregulation definition
Controlling body temperature at optimal level
Vasodilation
Vasodilation
Blood vessels widen to increase heat loss (when hot)
Vasoconstriction
Vasoconstriction
Blood vessels narrow to reduce heat loss (when cold)
Role of hypothalamus in body temp control
Role of hypothalamus in body temp control
Thermoregulatory centre - monitors temp & triggers responses
Osmoregulation definition
Osmoregulation definition
Control of water levels & mineral ions in blood
High water conc. outside cells - effect
High water conc. outside cells - effect
Water moves in by osmosis; cells swell & may burst
Kidneys role in osmoregulation
Kidneys role in osmoregulation
Filter blood, adjust water/ion reabsorption, excrete in urine