Question 2

Stimulus -> sensor -> control -> effector

In a negative feedback response, the order of signals starts with the stimulus, which triggers the sensor. The sensor then sends information to the control center, which processes the information and activates the effector to bring about a response to counteract the original stimulus.

A) Sensor -> control -> stimulus -> effector

This option incorrectly places the control center before the stimulus in the sequence. In a negative feedback loop, the stimulus occurs first to initiate the response, making this order invalid.

B) Stimulus -> sensor -> control -> effector

This is the correct order of signals in a negative feedback response. It accurately reflects the process where a stimulus is detected by a sensor, which then communicates with the control center to activate the effector.

C) Stimulus -> control -> sensor -> effector

This choice is incorrect because it places the control center before the sensor. The sensor must detect the stimulus first before any control action can be taken, rendering this sequence invalid.

D) Sensor -> stimulus -> control -> effector

This option also presents an incorrect order, as it suggests that the sensor comes before the stimulus. The sensor is responsible for detecting the stimulus, not the other way around, making this sequence incorrect.

Conclusion

The correct order of signals in a negative feedback response is crucial for maintaining homeostasis in the human body. Option B effectively outlines the sequence starting with the stimulus, followed by the sensor, control center, and finally the effector. All other options misrepresent the sequence, highlighting their incorrectness in understanding the negative feedback mechanism.