visual reading tool: body temperature control
in the human body, temperature is controlled through various feedback inhibition mechanisms.
in each of the diagrams below, fill in the words start and stop in the appropriate boxes.
then complete the sentences below so that each numbered sentence correctly describes its
corresponding number in the diagram.
1.
hypothalamus senses
temperature change and
sends signals that start
or stop heat production.
3.
hypothalamus senses
temperature change and
sends signals that start
or stop cooling mechanisms.
2.
1. __________ environment causes body temperature to __________.
2. body temperature __________.
3. __________ environment and exercise cause body temperature to __________.
4. body temperature __________.
4.

Question

Accepted Answer

# Brief Explanations:
To solve this, we analyze the body's temperature regulation:
1. Cold environment causes body temperature to drop (as cold surroundings make the body lose heat).
2. Body temperature decreases (due to cold environment).
3. Hot environment and exercise cause body temperature to rise (hot surroundings or exercise generate heat, increasing body temp).
4. Body temperature increases (due to hot environment or exercise).

For the boxes:
- In the first diagram (heat production, related to cold), when temp drops (cold), hypothalamus starts heat production (so left box: START? Wait, no—wait, the first diagram: if environment is cold (causing temp drop), hypothalamus senses drop and starts heat production. Wait, the boxes: the first diagram (1) is about heat production. So when body temp drops (cold environment), hypothalamus sends signals to start heat production (so left box: maybe the trigger is cold, but the boxes are START/STOP. Wait, the first diagram's left box: when body temp is too low (cold environment), hypothalamus sends signals to start heat production (so left box: START? No, wait the process: cold environment → body temp drops → hypothalamus senses drop → sends signals to start heat production (so the left box (before the text) would be the trigger (cold), but the boxes are START/STOP. Wait, the problem says "fill in START and STOP in the appropriate boxes". Let's re - examine:

Diagram 1 (heat production):
- When body temp is too low (e.g., cold environment), hypothalamus senses the drop and sends signals to start heat production (so the left box (before "Hypothalamus..."): maybe the trigger is cold, but the boxes are START/STOP. Wait, the text says "Hypothalamus senses temperature change and sends signals that start or stop heat production." So if the temperature is too low (needs heat production), hypothalamus sends signals to start heat production (so the box next to the text: START? Wait, no—the boxes are two per diagram. Let's think of feedback loops:

Cold scenario (heat production):
- Body temp drops (stimulus).
- Hypothalamus senses drop (receptor).
- Sends signals to start heat production (effector: start shivering, etc.). So in diagram 1: left box (maybe the initial trigger, but the boxes are START/STOP. Wait, the two boxes in diagram 1: let's say the left box is for when to start (when temp is low, start heat production) and the right box? No, maybe the first box (left) is START when temp is low (to start heat production), and the other box? Wait, maybe the first diagram (1) is for cold - induced heat production:
  - Left box: START (because when temp is low, we start heat production).
  - Right box: STOP? No, that doesn't make sense. Wait, maybe the first diagram (1) is: when body temp is too low, hypothalamus sends signals to start heat production (so the box next to the text: START), and when temp is normal, it stops (but the diagram is about starting/stopping heat production).

Diagram 3 (cooling mechanisms):
- When body temp is too high (hot environment or exercise), hypothalamus senses rise and sends signals to start cooling mechanisms (sweating, vasodilation). So left box: START (when temp is high, start cooling).

Now for the sentences:
1. Cold environment causes body temperature to drop.
2. Body temperature decreases.
3. Hot environment and exercise cause body temperature to rise.
4. Body temperature increases.

For the boxes:
- Diagram 1 (heat production):
  - Left box: START (to start heat production when temp is low).
  - Right box: STOP (when temp is normal, stop heat production—but maybe the other way. Wait, maybe the first diagram's left box is START (when temp is low, start heat production) and the right box is STOP (when temp is normal, stop). But the problem is a bit unclear without the diagram's visual, but based on knowledge:

- Diagram 1 (heat production):
  - Left box: START (initiates heat production when temp is low).
  - Right box: STOP (stops heat production when temp is normal).
- Diagram 3 (cooling mechanisms):
  - Left box: START (initiates cooling when temp is high).
  - Right box: STOP (stops cooling when temp is normal).

But the main sentences:
1. Cold environment causes body temperature to drop.
2. Body temperature decreases.
3. Hot environment and exercise cause body temperature to rise.
4. Body temperature increases.

# Answer:
1. Cold, drop
2. decreases
3. Hot, rise
4. increases

For the boxes (assuming standard feedback):
- Diagram 1 (heat production): Left box - START, Right box - STOP
- Diagram 3 (cooling mechanisms): Left box - START, Right box - STOP

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