Mechanism of Losing Heat

Q. Why do we perspire a lot when it is hot during summer?

Q.

Is sweating an example of diffusion?

Q. Why does the fan which does not cool the air of the room, has a cooling effect on our body?

1. Air movements over the body helps speed up the evaporation of sweat.
2. Air movements over the body causes loss of heat from the body.
3. Air movements reduce the blood supply to the skin.
4. Air movements reduce the sweat secreted by the sweat gland.

Q. Value based questions.
A monoglyceride may be larger than an amino acid. Why can monoglycerides be absorbed by simple diffusion whereas amino acids cannot?

Q. When the environmental temperature is low, vasoconstriction happens, as a result of which there is ______.

1. heat stroke
2. increased blood supply
3. less loss of heat
4. more sweat

Q. Pungent odour of faeces is due to

1. Indole
2. Scatole
3. Phenol and hydrogen sulphide
4. All the above

Q.

You are on a holiday to the beautiful, but hot Thar desert. Which of the following might happen in your body, in response to the high temperature?

1. Vasoconstriction

2. Shivering

3. Sweating

4. Vasodilation

Q.

Which of the following is not involved in the heat loss from the body?

1. Skin

2. Lungs

3. Intestine

4. Foods

Q. What does the given figure represent?

1. Increase heat loss from the body by vasodilation
2. Reduce heat loss from the body by vasoconstriction
3. Reduce heat loss from the body by vasodilation
4. Increase heat loss from the body by vasoconstriction

Q.

Which of the following is not involved in four heat loss channels of the body?

1. Lungs

2. Pancreas

3. Food

4. Skin

Q.

Which of the following is not involved in the heat loss from the body?

1. Lungs

2. Skin

3. Intestine

4. Foods

Q.

About 85% of the body heat is lost through ___.

1. skin

2. urine

3. lungs

4. nails

Q.

Which of the following is not involved in four heat loss channels of the body?

1. Skin

2. Lungs

3. Pancreas

4. Food

Q.

Why does the fan which does not cool the air of the room, has a cooling effect on our body?

1. Air movements reduce the blood supply to the skin.

2. Air movements over the body helps speed up the evaporation of sweat.

3. Air movements over the body causes loss of heat from the body.

4. Air movements reduce the sweat secreted by the sweat gland.

Q.

About 85% of the body heat is lost through ___.

1. skin

2. lungs

3. urine

4. nails

Q.

Why does the fan which does not cool the air of the room, has a cooling effect on our body?

1. Air movements over the body helps speed up the evaporation of sweat.

2. Air movements over the body causes loss of heat from the body.

3. Air movements reduce the blood supply to the skin.

4. Air movements reduce the sweat secreted by the sweat gland.