3 Homeostatic equilibrium requires receptors that detect changes in physiological parameters such as the temperature, water potential and pH of the blood. Effectors are the cells, tissues and organs that carry out the functions necessary to restore those parameters to...
14 Homeostasis
Plant hormones – Gibberellin
Plant hormones – Auxin
Venus fly trap
Birth control
Hormonal communication
Homeostasis in plants
Abscisic acid and stomatal closure Abscisic acid (ABA) is a stress hormone that is secreted in response to difficult environmental conditions such as very high temperatures or much reduced water supplies. ABA triggers the closure of stomata to reduce transpiration and...
Production of urine in a nephron – Ultrafiltration and reabsorption
The blood in a glomerulus is separated from the space inside the renal capsule by: • the capillary wall (endothelium) which is one cell thick and has pores in it; • the basement membrane of the wall of the renal capsule; • the layer of cells making up the wall...
Osmoregulation
Osmoregulation is the control of the water content of body fluids. It is part of homeostasis, the maintenance of a constant internal environment. It is important that cells are surrounded by tissue fluid of a similar water potential to their own contents, to...
Thermoregulation – The control of body temperature
Ectotherms - Animals that have a variable body temperature. - Use behavioural mechanisms (e.g. lying in the sun when cold, moving into shade when hot). Such mechanisms can be very effective, particularly when coupled with internal mechanisms to ensure that the...
Homeostasis in mammals
VIDEO: Feedback loops https://www.youtube.com/watch?v=pR12XGWcn0U Negative feedback control of temperature https://www.youtube.com/watch?v=RgjKRJxvG-k Negative Feedback Control of Blood Pressure https://www.youtube.com/watch?v=YQMgV9pkwwA ...