Question

A condition is which the body's internal environment remains relatively constant within limits is

• A. Hematoma
• B. Homeostasis
• C. Haemopoiesis
• D. Hemostasis

Answer 1

Answer: (B)

Homeostasis

Homeostasis is the tendency to resist change in order to maintain a stable, and constant internal environment. The internal environment should be contains the optimum concentration of gases, nutrients, ions, and water, has an optimal temperature, and has an optimal pressure for the health of the cells. For example, the concentration of various ions in the blood must be kept steady, along with pH and the concentration of glucose. Maintenance of homeostasis usually involves negative feedback loops. These loops act to oppose the stimulus. Its works on first, high temperature will be detected by sensors—primarily nerve cells with endings in the skin and brain—and relayed to a temperature-regulatory control center in brain. The control center will process the information and activate effectors—such as the sweat glands—whose job is to oppose the stimulus by bringing body temperature down.