Great Nippy !!!

REGULATION OF HUMAN BODY TEMPERATURE –

LOSS OF HEAT THROUGH SWEAT

PRODUCTION

SCIENTIFIC CONCEPTExposure of our body to high temperature can lead to an increase in body temperature. Blood vessels near the skin’s surface dissipate heat well. Therefore, blood flow in the skin rises in cases of increased body temperature. To help heat dissipation, sweat production increases significantly. This is done by over three million sweat glands spread throughout the skin. Sweat production and evaporation is essential to keeping body temperature but it can lead to dehydration if water loss is not replaced by drinking.

ENGAGE

Figure 1 show a man suffer from fever. He started sweating after taking medicines. Why?

FIGURE 1

Answer :- This is how our body cools down

from the fever and gets rid of the extra heat.

EMPOWER

Covered jug with plastic

Uncovered jug

1. Place a clay jug in a plastic bag. Put a humidity sensor beside it, in the plastic bag.

2. Insert a temperature sensor in each clay jug, through the hole in the cover. Put humidity sensor beside the jug left in the open air.

3. Start the discovery.4. Pour hot water to the jugs ( about 200

ml to each one )5. Tie the plastic bag, covering one of the

jugs.

6. Run the experiment for 10 minutes and follow changes in humidity in the room and in the plastic bag. Follow the temperature changes in the two jugs.

7. After 10 minutes, remove the plastic bags covering one of the jugs.

8. Follow changes in humidity and temperature for an additional 10 – 15 minutes.

RESULT

TABLE

GRAPH

EMPOWER

DISCUSSIONS1. What is the effect of covering

the jug with a plastic bag : a) on the humidity

measured in the bagAnswer: not change

b) on the temperature change of the water in the jugAnswer: increase

2. Compare the changes in temperature and humidity in the two jugs

- Temperature of covered jug is slightly increase but temperature of uncovered jug increase drastically.

- Humidity of covered jug is does not change and humidity of uncovered jug slightly decrease.

3) Is the humidity change after plastic bag was removed?

- Humidity decrease immediately after remove the plastic bag.

4) During the experiment, the jug walls are wet. Why?

- In this experiment, the jug wall represent our body. The jug wall are wet in order to lower water temperature inside the jug.

5) What is the real phenomenon regarding the process of heat loss from the jugs?

- Sweating

ENHANCE

Based on the both phenomena, what are the differences of sweat production

between this two people? Explain why?

Answer - sweat production of people in left picture is less active than people in right picture.- this is because in hot area, people normally sweating actively for regulation of body temperature as when sweat is produce, it will evaporate and cool down our body temperature.

UNIQUE FEATURES1. Real-time measurements of the process.2. Concomitant measurement of various

factors affecting the process: water temperature, difference between water temperature and humidity.

3. Use of a model system to improve the comprehension of the process of heat loss, by separating the stage of water accumulation from the stage of water evaporation.

4. Better understanding the connection between heat loss and humidity.