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SEHS: Option A: A2 Environmental Factors

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Presentation on theme: "SEHS: Option A: A2 Environmental Factors"— Presentation transcript:

1 SEHS: Option A: A2 Environmental Factors


3 Almost all energy on this planet originates from:
Explain the relationship between cellular metabolism and the production of heat in the human body Almost all energy on this planet originates from: Where does it go from there? plants- animals (stored in “food”) Carbs, lipids, proteins  metabolized  stored as ATP via aerobic cellular respiration

4 Cont’d ATP = metabolic reactions, including:
Muscle contraction and movement 20% of E to movement 80% lost as heat

5 Normal physiological range for CORE body temp Tc
oF Core body temp – deep within the body

6 Thermoregulation Four mechanisms that move heat through the blood, to the skin, in order to transfer it to the environment:

7 Cont’d Conduction – solid on solid transfer
Convection – air current transfer Radiation – wave transfer (reradiated Evaporation – evap cooling

8 Discuss the significance of humidity and wind in relation to body heat loss
High humidity = lower heat loss Low humidity = higher heat loss Why? High wind = higher heat loss Low wind = lower heat loss

9 The formation of sweat and the sweat response
Sweat - the production of fluids secreted by the sweat glands in the skin of mammals. Two types of sweat glands can be found in humans: Eccrine glands and apocrine glands. The eccrine sweat glands are distributed over much of the body

10 Skin as organ of thermoregulation

11 Physiological and anatomical response to temp changes

12 Discuss the physiological responses to prolonged exercise in the heat
Recall cardiac drift – as temperature increases, blood volume decreases due to sweating, venous return decreases…………..what happens to HR? Metabolically it causes increased muscle glycogen breakdown due to reduced blood flow to the muscles = anaerobic respiration = higher blood lactate levels

13 HOMEWORK Outline 3 health risks associated with exercising in the heat. What steps can be taken to prevent these conditions? What treatments are used to address these conditions if they occur?

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