Process related to homeostasis
-
Upload
muzammil-siddique -
Category
Presentations & Public Speaking
-
view
316 -
download
1
Transcript of Process related to homeostasis
Muzammil Siddique
Muzammil Siddique
Process Related to Homeostasis
ThermoregulationOsmoregulation
ExcretionFeedback
Mechanism
Muzammil Siddique
ThermoregulationThe process of maintaining a steady body
Temp.
System Involved:MuscularIntegument (skin)RespiratoryCirculatoryNervous SystemEndocrine
Muzammil Siddique
Muzammil Siddique
In PlantsLow 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
OsmoregulationLand Animals: “Drying up” is the huge problem.Adaptations areWaxy exoskeletons of insectsLayers of dead Keratinized skin cellsDrinking and eating moist foodsUsing metabolic water(water produced
during cellular respiration) e.g. Kangaroo.
Muzammil Siddique
Muzammil Siddique
Muzammil Siddique
In PlantsHydrophytes: Extensive stomata present on
the upper surface.Mesophytes: Sufficient supply
Stomata openRestricted Supply Stomata close.Xerophytes: Thick and small leavesWaxy and leathery cuticleStomata are on the lower surface of leavesStem stores water
Muzammil Siddique
ExcretionElimination 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
FeedbackFeedback compares current conditions to the body’s comfort levels.It has two types:Negative FeedbackPositive feedback
Muzammil Siddique
Negative FeedbackCounteracts change and brings the body back
to homeostasis.
Negative feedback loop
Muzammil Siddique
Positive FeedbackIncreases 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