ENVIRONMENTAL CON. - HEAT 1 Flashcards

Temperature regulation mechanisms (radiation, convection, conduction, evaporation)

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1
Q

Different environmental conditions to consider include the following name all 3?

A

-Temperature - Hot/cold
-Humidity - Wet/dry
-Altitude /sea level

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1
Q

Heat loss from the body occurs in 4 different ways name them

A

-Conduction
-Convection
-Radiation
-Evaporation

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2
Q

Define Conduction

A

When heat is exchanged by 2 objects in contact with each other

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3
Q

Define Convection

A

When heat is exchanged with/by a fluid that is flowing

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4
Q

Define Radiation

A

Occurs when heat is transferred from a warmer body to the cooler surroundings without physical contact

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5
Q

Define Evaporation

A

Is the cooling of the body as a result of the vaporisation of sweat

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6
Q

Which method is most effective in dry conditions

A

Evaporation

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7
Q

As humidity increases?

A

Evaporation becomes less effective

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8
Q

The rate of sweating is dependent on what factors

A

-Gender (male more than female)
-Number of sweat glands
-Body surface area (↑SA = ↑ sweat)
-How fit you are (↑fitness = ↑ sweat if all other factors are equal, e.g., body SA)

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9
Q

If there is 100% Humidity what and why cant something happen resulting in what

A

Evaporation

As the sweat cannot evaporate of skin that is saturated by the humidity

Resulting in core temp rising

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10
Q

Dehydration becomes a problem due to?

A

A large volume of fluid being lost

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11
Q

Excessive sweating leads to a loss of body fluids, which results in what

A

The core temp rising

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12
Q

Sweat loss can reach how much % of body mass

Less than 2% means?

A

6-10%

Means performance and thermoregulation are comprimised

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13
Q

The body’s preferred mechanism of heat loss is dependent upon the following 3 factors name them

A
  1. Environment
  2. Age
  3. Physiological State
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14
Q

If Ambient temp is above the core temp what is the only method of heat loss

A

Evaporation

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15
Q

If its windy what will occur in 1. Environment

A

Forced Convection

16
Q

Explain why children dont sweat as much

A

Their sweat glands are not developed as much as adults are

17
Q

a reduction in plasma volume leads to a what?

A

Decrease in sweat rate