Sweating is an important mechanism for keeping us cool in hot weather. Which of the following correctly explains the reason for this?
A. when the sweat evaporates, it absorbs heat from the body and cools it down.
B. the body loses heat by directly converting heat into sweat which comes out.
C. the sweat absorbs heat from the surrounding air, on evaporation, making it cool.
D. excess salts heat up the body, the body loses heat by removing these salts along with water in the form of sweat.
Answers
SWEATING IS AN IMPORTANT MECHANISM FOR KEEPING US COOL IN HOT WEATHER. The best way to describe it is option no. A which is : -
A.When the sweat evaporates, it absorbs heat from the body and cools it down
Answer:
Sweating is an important mechanism for keeping us cool in hot weather as : - A. when the sweat evaporates, it absorbs heat from the body and cools it down.
Explanation:
•The hypothalamus, a tiny area of the brain, signals to the eccrine sweat glands dispersed throughout your body that it is time to start sweating to cool you down as soon as your body's internal temperature starts to rise.
•While your sweat may be streaming off of you, cooling off isn't as simple. For this procedure to actually take place, some of the sweat that has been dripping off of your skin must evaporate.
•This is due to a physics concept known as "heat of vaporisation," which is how sweating helps to cool your body.
•Your skin needs heat in order for perspiration to be vaporised off of it. You start to cool when the sweat turns from beads to vapour due to your body's extra heat. The heat from the body is used to convert sweat into vapour, the body cools down.