homeostasis

Homeostasis

The maintenance of an organisms internal Environment within set limits despite external changes

What are internal conditions regulated by

Endocrine and nervous systems as well as behavioural patterns

Negative feedback

Self regulating mechanism which triggers corrective mechanisms whenever the internal Environemtnal changes from its normal level

Positive feedback

A deviation form normal conditions is amplified leading to a further deviation

How do ectothermic control their temperatures

Using their surroundings/ Environment

Examples of ectothermic

Intervtebrates, fish, amphibians and reptiles

Behavioural responses in ecotherms

Basking, oriente their bodies so maximal SA exposed to sun,, extend bodies to increase SA to sn, press bodies to warm ground, huddle, shelter from sun in rocks or burrows, and opposite argument for all heating up

Physiological responses to warming by ectotherms

Lizards living in colder climates have darker coloured skin so absorb more radiation

Are Endo or ectotherms more vulnerable to change in the environment

Ectotherms

How do Endotherms regulate temperature

Rely on metabolic processes to warm up/ maintain a stable core temp regardless of the temperature of the environment

Why do endotherms need more food than Ecothterms of similar sizes

Metabolic rate I s around 5x more

Behavioural responses of endotherms

Hibernation, clothing, homes & insulation

Physiological responses of endotherms

Peripheral temperature receptors, thermoregulatory centres of hyothalamys, skin, muscle, vasodilation and constriction

Excretion=

Removal of metabolic waste from the body

Metabolic waste=

Waste substances that might be toxic or are produced in excess by the reaction inside cells

Organs involved in excretion

Lungs (CO2), liver( Amino acids → urea), kidney (urea→ urine), skin (sweat)