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4b - Thermoregulation - Coggle Diagram
4b - Thermoregulation
Hypothalamus
Temperature control
- The Triggers -
Temperature change in blood of carotid artery
Nerve impulses from skin receptors
- Nerve impulses sent to effectors:
Sweat glands
skin arterioles
hair erector
muscles
skeletal muscles
- Hypothalamus : the body’s temperature monitoring centre
- Themoreceptors are found in the Hypothalamus
-
The hypothalamus itself also contains thermoreceptors, which detect changes in blood
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Thermoregulation
Ectotherm
- An animal which is unable to regulate its heat by physiological means, they obtain most
of their body heat by absorbing it from their surroundings.
-
Endotherm
- An animal which is able to maintain its body temperature at a relatively constant level irrespective of external temperature changes.
- Heat generated by their high metabolic rate.
Examples: Humans, dogs, brown bears
Humans shiver when cold, sweat when too hot
-
How Does It Work?
- Receptors in the body detect changes in an environmental factor and send out nerve or hormonal signals to effectors.
- These effectors bring about certain changes in the body to return the internal environment to its
set point or norm (Optium level).
-
-
1) messages (nerves/hormones) -----> 2) effectors ----> 3) corrective mechanism bringing about
negative feedback control
(+) ------------->
receptor cells -----------------------> repector cells factor effecting internal enviromment ats it optium/norm
factor affecting
internal environment
at its norm/optimum
(-) ------------->
messages (nerves/hormones) -----> effectors ----> corrective mechanism bringing about negative feedback control