Homeostasis Of Body Temperature Flashcards Preview

Human Biology - Test 3 > Homeostasis Of Body Temperature > Flashcards

Flashcards in Homeostasis Of Body Temperature Deck (8):
0

What does a rising body temperature prompt?

Change in blood flow to skin - vasodilation. Allows heat loss via conduction, convection, radiation and evaporation. Controlled by autonomic.
Deceased metabolism - reduced secretion of thyroxine.
Sweat - cools by evaporating from body. Controlled by sympathetic.
Behavioural responses - staying still, shade, aircon.

1

What does a falling body temperature prompt?

Changes in blood flow to skin - vasoconstriction. Allows less heat to be lost via skin. Controlled by sympathetic.
Increased metabolism - hypo stimulates ant lobe which secretes TSH, to release thyroxine.
Shivering - hypo stimulates parts of brain that increase muscle tone to start moving to produce heat.
Behavioural responses - huddling, warm clothes, heating.

2

How does the body control thermoregulation?

Hypothalamus monitors temperature of blood and receives impulses from peripheral theremoreceptors in skin and mucus membrane.

3

What is thermoregulation?

Maintaining balance between heat production and heat loss.

4

Describe the feedback loop for falling body temperature.

Stimulus - falling body temp.
Receptor - theremoreceptors.
Modulator - hypothalamus.
Effector - shivering, vasoconstriction, increased metabolic rate.
Response - body temp rises.

5

Describe the feedback loop of a rising body temperature.

Stimulus - rising body temperature.
Receptor - theremoreceptors.
Modulator - hypothalamus.
Effector - sweating, decreased metabolic rate, vasodilation.
Response - body temp decreases.

6

Name two mechanisms the nervous system would control to maintain core temperature of a biologist in Antarctica.

Shivering - contraction of skeletal muscles producing heat.
Vasoconstriction - reduced diameter of blood vessels reduces blood flow to skin.

7

What is the modulator for control of body temperature?

Hypothalamus.