Homeostasis Of Body Temperature Flashcards Preview

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

Flashcards in Homeostasis Of Body Temperature Deck (8):

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.


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.


How does the body control thermoregulation?

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


What is thermoregulation?

Maintaining balance between heat production and heat loss.


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.


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.


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.


What is the modulator for control of body temperature?