1) What term is used to describe the maintenance of a constant internal environment? a) Homeostasis b) Genetics c) Increase d) Variation 2) Homeostasis is the process by which the body maintains ________________ internal conditions, despite changes in the external environment. a) Variable b) Erratic c) Stable d) Turbulent 3) Homeostasis operates through two main feedback mechanisms: a) Plus and minus feddback b) High and low feedback c) Left and right feedback d) Negative and positive feedback 4) Positive feedback amplifies or intensifies the original stimulus instead of reversing it. a) True b) False 5) True or false: Negative feedback maintains homeostasis by counteracting (reversing) the stimulus to restore balance. a) True b) False 6) What feeback mechanism is more common? a) Postitive feedback b) Negative feedback 7) What is the correct order to maintain homeostasis? a) Effector → Control Centre → Sensor → Stimulus b) Sensor → Stimulus → Effector → Control Centre c) Stimulus → Sensor → Control Centre → Effector d) Control Centre → Effector → Sensor → Stimulus 8) What is a stimulus? a) A response carried out by the body b) A change in the internal or external environment c) A type of muscle movement d) A signal sent from the brain 9) What is the main role of a sensor (receptor)? a) To carry out the body’s response b) To detect a change in the environment c) To restore balance directly d) To detect a change in the environmentTo produce hormones 10) What does the control centre do? a) Detects a stimulus b) Sends messages to receptors c) Processes information and initiates a response d) Produces movement only 11) What is the role of an effector? a) To detect a change in the environment b) To send messages to the control centre c) To process information in the body d) To carry out the response to restore balance 12) Which of the following is most likely to be an effector? a) Muscle b) Brain c) Nerve d) Eye 13) Which hormone is released in response to a decrease in blood glucose? a) Glucagon b) Insulin c) Oestrogen d) Testosterone 14) Which hormone is released in response to a decrease in blood glucose? a) Glucagon b) Insulin c) Oestrogen d) Testosterone 15) What is normal body temperature? a) 25°C b) 30°C c) 37°C d) 42°C 16) Which of these is a response to an increase in body temperature? a) Vasodilation b) Shivering c) Vasoconstriction d) Body hair standing upright 17) Which of these is a response to a decrease in body temperature? a) Increased sweating b) Vasoconstriction c) Vasodilation d) Body hairs lying flat 18) Which organ detects changes in blood glucose? a) Pancreas b) Liver c) Kidney d) Brain 19) Which hormone is released in response to an increase in blood glucose? a) Glucagon b) Insulin c) Oestrogen d) Testosterone 20) Pilorelaxation causes hairs on our body to flatten to help __________________. a) produce more body heat b) trap more air and keep the body warm c) increase heat loss from the body d) stop sweating 21) Piloerection is when the hairs on your skin stand up to trap air and help keep the body warm. a) True b) False 22) When cold, curling yourself into a ball decreases surface area and helps trap heat to minimise heat loss and keep the body warm. a) True b) False

Homeostasis

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