IB Biology Topic D3.3.6 Thermoregulation Mechanisms in Humans Revision Notes (SL/HL)

IB Biology Topic D3.3.6 Thermoregulation Mechanisms in Humans Revision Notes (SL/HL) | RevisionDojo

How the Body Loses or Conserves Heat

When core temperature drifts from the set point, the hypothalamus triggers effectors in the skin, muscles and fat that either lose or conserve heat.

Responses to Heat: Moving Heat to the Skin and Away

Vasodilation
1. Skin arterioles widen, so more warm blood flows to vessels near the skin surface.
2. Heat then radiates from the surface to the environment, cooling the body.
Sweating
1. Sweat glands release sweat onto the skin.
2. As the sweat evaporates it takes heat from the skin, cooling the body.
Behavioural Adjustments
1. Moving into shade or shelter reduces heat gain from the surroundings.

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Lorem ipsum dolor sit amet, consectetur adipiscing elit.
Sed do eiusmod tempor incididunt ut labore et dolore magna aliqua.
Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris.
Duis aute irure dolor in reprehenderit in voluptate velit esse cillum.

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How the Body Loses or Conserves Heat

When core temperature drifts from the set point, the hypothalamus triggers effectors in the skin, muscles and fat that either lose or conserve heat.

Responses to Heat: Moving Heat to the Skin and Away

Vasodilation
1. Skin arterioles widen, so more warm blood flows to vessels near the skin surface.
2. Heat then radiates from the surface to the environment, cooling the body.
Sweating
1. Sweat glands release sweat onto the skin.
2. As the sweat evaporates it takes heat from the skin, cooling the body.
Behavioural Adjustments
1. Moving into shade or shelter reduces heat gain from the surroundings.

Definition

Paywall

(on a website) an arrangement whereby access is restricted to users who have paid to subscribe to the site.

anim nostrud sit dolore minim proident quis fugiat velit et eiusmod nulla quis nulla mollit dolor sunt culpa aliqua

Duis aute irure dolor in reprehenderit

Note

Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam quis nostrud exercitation.

Excepteur sint occaecat cupidatat non proident

Tip

Lorem ipsum dolor sit amet, consectetur adipiscing elit.
Sed do eiusmod tempor incididunt ut labore et dolore magna aliqua.
Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris.
Duis aute irure dolor in reprehenderit in voluptate velit esse cillum.

A - Unity and Diversity9 subtopics

B - Form and Function10 subtopics

C - Interaction and Interdependence9 subtopics

D - Continuity and Change12 subtopics

IB Biology Topic D3.3.6: Thermoregulation Mechanisms in Humans Notes

A - Unity and Diversity9 subtopics

B - Form and Function10 subtopics

C - Interaction and Interdependence9 subtopics

D - Continuity and Change12 subtopics

How the Body Loses or Conserves Heat

Responses to Heat: Moving Heat to the Skin and Away

anim nostrud sit dolore minim proident quis fugiat velit et eiusmod nulla quis nulla mollit dolor sunt culpa aliqua

Duis aute irure dolor in reprehenderit

Excepteur sint occaecat cupidatat non proident

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How the Body Loses or Conserves Heat

Responses to Heat: Moving Heat to the Skin and Away

anim nostrud sit dolore minim proident quis fugiat velit et eiusmod nulla quis nulla mollit dolor sunt culpa aliqua

Duis aute irure dolor in reprehenderit

Excepteur sint occaecat cupidatat non proident

Unlock the rest of this chapter with a free account