Understanding Feedback Loops and Receptors

What is the correct order of the stimulus-response model?

• Response → Stimulus → Effector → Receptor

• Receptor → Stimulus → Effector → Response

• Stimulus → Receptor → Control Centre → Effector → Response

• Control Centre → Receptor → Stimulus → Effector

What is the function of a receptor in the stimulus-response model?

• To send signals to muscles for movement

• To detect changes in the environment (stimulus)

• To generate hormones for the body

• To process information in the brain

Which of the following is an example of a negative feedback loop?

• Contractions during childbirth (increasing until birth)

• Blood clotting in a wound (amplifying clotting)

• Sweating to cool down the body

• Increase in oxytocin during labour

In a feedback loop, what role does the effector play?

• Detects the stimulus

• Processes the information

• Responds to restore balance

• Sends signals to the receptor

In a positive feedback loop, what happens to the stimulus?

• The response increases or amplifies the stimulus

• The response decreases or stops the stimulus

• The response prevents the stimulus from occurring

• The body ignores the stimulus

Which of these is an example of a positive feedback loop?

• Blood sugar regulation (insulin lowering glucose levels)

• Maintaining body temperature (sweating/shivering)

• Blood clotting after injury (platelets keep clotting until wound closes)

• Regulating heart rate (returning to normal after exercise)

What type of receptor detects temperature changes?

• Mechanoreceptors

• Photoreceptors

• Thermoreceptors

• Chemoreceptors

In response to cold temperatures, which action occurs as part of a negative feedback loop?

• Sweating

• Shivering

• Increased heart rate

• Increased blood flow to the skin

What is the primary role of the control centre in a feedback loop?

• Detects the stimulus

• Processes the signal and determines a response

• Carries out the response

• Blocks the stimulus

If blood glucose levels drop, how does the body respond in a negative feedback loop?

• Insulin is released to lower glucose levels

• Glucagon is released to increase glucose levels

• The body stops responding to glucose changes

• More glucose is removed from the blood