Biology 12: Homeostasis, Water, and Organic
Molecules Overview UPDATED ACTUAL Questions
and CORRECT Answers
What physiological changes occur Shivering, high blood pressure, fast heart rate, fast
when the sympathetic nervous respiratory rate, and contraction of blood vessels.
system is activated?
What is homeostasis? The maintenance of a stable internal environment
despite changes in the external environment.
What are the four components of 1. Change (stimuli), 2. Receptors, 3. Control center,
homeostatic mechanisms? 4. Effectors.
, What role do receptors play in They detect changes (stimuli) and alert the control
homeostasis? center to counteract it.
What is the function of the control It includes a set point and sends commands to
center in homeostasis? effectors to counteract changes.
What are effectors in the context of Physical change agents such as muscles, glands,
homeostasis? and fluids that enact responses to maintain
balance.
What is negative feedback in A mechanism that counteracts changes to maintain
homeostasis? a stable internal environment.
How does the body regulate blood Baroreceptors detect blood pressure changes and
pressure? send signals to the control center, which adjusts
heart rate accordingly.
What happens when blood pressure The heart rate increases to pump more blood and
is too low? raise blood pressure.
What initiates the positive feedback The contact of the fetus's head with the cervix.
mechanism during childbirth?
What hormone is released during Oxytocin.
childbirth to intensify contractions?
Molecules Overview UPDATED ACTUAL Questions
and CORRECT Answers
What physiological changes occur Shivering, high blood pressure, fast heart rate, fast
when the sympathetic nervous respiratory rate, and contraction of blood vessels.
system is activated?
What is homeostasis? The maintenance of a stable internal environment
despite changes in the external environment.
What are the four components of 1. Change (stimuli), 2. Receptors, 3. Control center,
homeostatic mechanisms? 4. Effectors.
, What role do receptors play in They detect changes (stimuli) and alert the control
homeostasis? center to counteract it.
What is the function of the control It includes a set point and sends commands to
center in homeostasis? effectors to counteract changes.
What are effectors in the context of Physical change agents such as muscles, glands,
homeostasis? and fluids that enact responses to maintain
balance.
What is negative feedback in A mechanism that counteracts changes to maintain
homeostasis? a stable internal environment.
How does the body regulate blood Baroreceptors detect blood pressure changes and
pressure? send signals to the control center, which adjusts
heart rate accordingly.
What happens when blood pressure The heart rate increases to pump more blood and
is too low? raise blood pressure.
What initiates the positive feedback The contact of the fetus's head with the cervix.
mechanism during childbirth?
What hormone is released during Oxytocin.
childbirth to intensify contractions?
