Which of the following is not an example of homeostasis Regu

Which of the following is not an example of homeostasis? Regulation of blood solute concentration in a fish regulation of body temperature in a fish regulation of blood pH in a human regulation of body temperature in a dog regulation of blood glucose levels in a human Counter-current heat exchange helps maintain a constant internal body temperature through all of the following EXCEPT: transferring heat between arteries and veins lowering the temperature of the extremities to prevent heat loss blood in arteries flowing in the opposite direction as blood in veins sacrificing warmth of the body core to increase the temperature of the extremities. warming blood returning to the body from the extremities

Solution

Answer

Part C

Homeostasis is a maintenance or regulation of the stable internal environment. When the body sense any changes in its activities, the body will initiate mechanisms to oppose it or reverse it. It is the key mechanism for maintenance of health and loss of this homeostatic control can cause illness or death. The stable condition depends upon many variables such as body temperature, pH, solute concentration, blood sugar level, and fluid balance.

The maintenance of body temperature in the fish depicts the homeostasis mechanism at its best. Most of the fish are poikilothermic which means that their body temperature varies with a change in temperature. In order remain healthy and alive at different temperatures, fish produce heat from their metabolic activity to survive in old temperatures and also produce anti-freeze protein which prevents freezing of the blood. Fish release excess heat through their gills. When the heat inside the vessels of gills comes in contact with the water outside, the heat is lost.

Therefore, the correct answer is option (b).

Part D

Body temperature is not homogenous. When you are cold your body reduces the circulation to the extremities. In the counter current process, the heat flow between two flowing bodies shows flow in opposite direction in each other which do not happen in sacrificing warmth of the body core to increase the temperature of the extremities.

All other options are the best examples of counter current because they have the flow of heat from opposite directions.

Therefore, the correct asnwer is option (d).