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Muzammil Siddique
Process Related to
Homeostasis
Thermoregulation
Osmoregulation
Excretion
Feedback Mechanism
Muzammil Siddique
Thermoregulation
The process of maintaining a steady body Temp.
System Involved:
 Muscular
 Integument (skin)
 Respiratory
 Circulatory
 Nervous System
 Endocrine
Muzammil Siddique
Muzammil Siddique
In Plants
Low Temperature:
•Bring changes in solutes
composition of cell
(super cool without ice
formation).
•Increasing proportion of
unsaturated fatty acid.
High Temperature:
•Evaporative cooling
•Heat-shock proteins
Muzammil Siddique
Muzammil Siddique
Osmoregulation
Land Animals:
“Drying up” is the huge problem.
Adaptations are
 Waxy exoskeletons of insects
 Layers of dead Keratinized skin cells
 Drinking and eating moist foods
 Using metabolic water(water produced during cellular
respiration) e.g. Kangaroo.
Muzammil Siddique
Muzammil Siddique
Muzammil Siddique
In Plants
 Hydrophytes: Extensive stomata present on the upper
surface.
 Mesophytes: Sufficient supply Stomata open
Restricted Supply Stomata close.
 Xerophytes:
Thick and small leaves
Waxy and leathery cuticle
Stomata are on the lower surface of leaves
Stem stores water
Muzammil Siddique
Excretion
Elimination of waste products
In Plants through:
 Leaves (shedding there leaves)
 Old xylem (store strange chemicals in xylem e.g.
ebony)
 Roots (secrete waste products e.g. conifers)
In Animals through:
 Skin ( sweat)
 Lungs (exhalation of Carbon dioxide)
 Kidney (in the form of urine)
 Liver (Detoxify poisons, produce ammonia, urea, uric
acid from nitrogenous waste, Recycle old RBC)
Muzammil Siddique
Muzammil Siddique
Feedback
Feedback compares current conditions to the body’s
comfort levels.
It has two types:
 Negative Feedback
 Positive feedback
Muzammil Siddique
Negative Feedback
Counteracts change and brings the body back to
homeostasis.
Negative
feedback
loop
Muzammil Siddique
Positive Feedback
Increases change away from the set points. Needed for
rapid change in the body.
e.g. Torn blood vessels stimulates the release of clotting
factors to stop blood flow.
Muzammil Siddique
Muzammil Siddique
Example of Positive and Negative
Feedback Loop
Muzammil Siddique
Muzammil Siddique

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Process related to homeostasis