Question

the figure shows a homeostatic system with four components (a, b, c, and
egulated variable\).

which box represents the sensor of the homeostatic system?

a. box a
b. box b
c. box c
d. i do not know the answer.

Explanation:

Identify the components of a homeostatic loop

Using the Homeostatic Control Loop knowledge point

In a standard homeostatic control loop, the components function in a specific sequence to maintain stability:

1. Regulated Variable: The physical or chemical factor in the body that is being kept within a narrow range.
2. Sensor (Receptor): Detects changes in the regulated variable and sends this information to the integrating center.
3. Integrator (Control Center): Compares the incoming signal from the sensor to a set point and determines the appropriate response, sending a signal to the effector.
4. Effector: Executes the response that directly alters the regulated variable to bring it back toward the set point.

Trace the flow of information in the diagram

Using the Homeostatic Control Loop knowledge point

Looking at the directional arrows in the provided diagram:

• The arrow goes from the regulated variable directly into Box A. This means Box A is the component that directly monitors or detects the state of the regulated variable. Therefore, Box A must represent the sensor.
• Box A (sensor) then sends a signal to Box B. This makes Box B the integrator (control center).
• Box B (integrator) sends a signal to Box C. This makes Box C the effector.
• Box C (effector) acts to adjust or influence the regulated variable, completing the feedback loop.

Determine the correct multiple-choice option

Using the Homeostatic Control Loop knowledge point

Since the question asks which box represents the sensor of the homeostatic system, and our tracing shows that Box A receives the direct input from the regulated variable to detect its state, Box A is the sensor. This corresponds to option a.

Answer:

• a. Box A (Correct answer)
• b. Box B
• c. Box C
• d. I do not know the answer.