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1. What is homeostasis and why is it important for physiological
functions?
Answer: Homeostasis is the ability of the body to maintain a relatively
constant internal environment despite changes in the external
environment. It is important for physiological functions because it ensures
that the cells and tissues can perform their normal activities within optimal
conditions of temperature, pH, oxygen, glucose, etc.
2. What are the three main components of a feedback system and how do
they work together to regulate physiological functions?
Answer: The three main components of a feedback system are a sensor, a
control center, and an effector. The sensor detects changes in a variable
(such as blood pressure) and sends a signal to the control center (such as
the brain). The control center compares the signal with a set point (the
normal value) and sends a command to the effector (such as the heart).
The effector responds by adjusting the variable back to the set point or
closer to it.
3. What is the difference between positive and negative feedback systems
and give an example of each?
Answer: Positive feedback systems are those that amplify or reinforce the
initial change in a variable, while negative feedback systems are those that
oppose or counteract the initial change in a variable. An example of a
positive feedback system is blood clotting, where the formation of a clot
triggers more clotting factors to be released until the bleeding stops. An
example of a negative feedback system is thermoregulation, where the
body adjusts its heat production and heat loss to maintain a stable body
temperature.
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