Describe the components and functions of a homeostatic system and relate negative feedback. What will be an ideal response?
ANSWER: Components of a homeostatic system include the sensor, which monitors the magnitude of
the variable being controlled; the integrator or control center which compares the sensor's
input with what is considered a normal value (set point). The integrator then sends
appropriate signals to the last component of the system, the effector. The effector in turn
brings about an appropriate change to return the system back to the normal set point.
Negative feedback is a process that restores a factor to normal by moving the factor in the
opposite direction of the initial change. Negative feedback is the basis for homeostasis.
You might also like to view...
Many species might coexist in a particular environment by occupying different ecological
A. biomes. B. niches. C. territories. D. domains. E. ranges.
Match the following items with the correct phrases.
_______1. Some of these bacteria live in and near root nodules of plants called legumes, including alfalfa, clover, peas, soy beans, and peanuts. _______2. Convert nitrogen in the air into ammonia in the soil by a process called nitrogen fixation. _______3. Convert the nitrogen that is found in dead plants and animals to ammonia in the soil by a process called ammonification. _______4. Convert nitrates in the soil to nitrogen in the air by a process called denitrification. _______5. Convert ammonia in the soil to nitrites and nitrates by a process called nitrification. a. decomposers and saprophytes b. denitrifying bacteria c. nitrifying bacteria d. nitrogen-fixing bacteria e. nitrogen-unfixing bacteria
The poliomyelitis virus appears to selectively destroy
A. sensory nerve cells. B. mixed nerve cells. C. autonomic nerve cells. D. motor nerve cells.
The enzymes for cellular respiration in eukaryotic organisms are located within the mitochondria. In prokaryotic organisms, these enzymes are attached to the
A. nuclear membrane. B. ribosomes. C. circular DNA. D. cell membrane. E. cell wall.