A the follicular stage to take place. The follicular

A feedback loop is a way of regulating
homeostasis in your body. Feedback loops are started by a stimulus, which could
be a hormone or another type of stimulus. The stimulus brings about a change
and disrupts the homeostasis of our bodies. The sensor, which is specific to
the hormone released or the change in our body, detects the change. An example
of this would be the thermostat in our house, it detects the change in
temperature. After the stimulus has been detected it is time for a response,
this stage is known as the control. And the last stage, after your body has
responded to the change, is known as the effector. This stage is the effect
that the response has on your body, for example it could cool you down, or
regulate your blood-sugar levels. There are two types of feedback loops:
negative and positive. Negative feedback loops move your body back towards the
set point. Examples of this include temperature regulation and maintaining
blood glucose levels. In positive feedback loops they move away from the target
set point. Examples of positive feedback are fruit ripening or during childbirth.
More negative feedback leads to less output, whereas more positive feedback
leads to more output. For example the more contractions you have the more the
baby pushes and eventually leads to giving birth.

                The
menstrual cycle in nonpregnant human females is controlled by both positive and
negative feedback mechanisms. There are three hormones involved in the menstrual
cycle: estrogen, LH, and FSH. The hypothalamus sends signals to the pituitary
gland to release FSH (follicle stimulating hormone) and LH (luteinizing hormone).
FSH causes the follicular stage to take place. The follicular stage causes more
estrogen to be released, and then eventually negative feedback will take place
and tell the body to stop releasing FSH.  So once the FSH has stopped being released
more estrogen is being released, once enough estrogen has been released it uses
positive feedback mechanisms. It uses positive feedback because as more
estrogen is released it tells the pituitary gland to release more LH. LH causes
the follicle that is left and has not deteriorated (formed during the
follicular stage) to rupture, and an egg is released, this is known as
ovulation. After ovulation occurs another negative feedback takes place. This is
when the follicle cells are replaced by corpus luteum. The corpus luteum releases
some estrogen and progesterone. These two hormones send negative feedback
signals to stop the secretion of FSH and LH. So, negative feedback is used
mainly by estrogen and progesterone to stop the release of FSH and LH. Also,
positive feedback is used to release more LH and cause ovulation to take place.

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                Blood
glucose levels in humans are controlled by negative feedback mechanisms. In
negative feedback loops the stimulus is either increased or decreased,
according to where the set point is. If your body does not have enough sugar
then it will go below the set point. This is the stimulus, and there are
certain cells within the pancreas that are the receptors. There are two types
of cells within the pancreas that help control blood glucose levels: alpha
cells secrete glucagon and beta cells secrete insulin. So, once the stimulus is detected by
the receptor, the response is activated. When the blood glucose level is too
low glucagon is released and this works in the causes the blood glucose levels
to rise. It does this because excess sugar is stored in the liver as glycogen,
and it is broken down into glucose and then released into the blood. Once the
glucose is released into the blood it is detected by the stimulus and once it
has moved back towards the set point glucagon is not released at as high of
rates. On the other hand when a person has just eaten a big meal and their
blood glucose levels are too high the stimulus is detected, and once again the pancreas
recognizes this. In this case however, the beta cells of the pancreas, which
are insulin are secreted to dampen the stimulus. Insulin triggers cells in your
body to take up glucose so there is not as much in the blood stream, and it
also causes glucose to be converted into glycogen and be stored. This then
dampens the stimulus and less insulin is secreted and the body is back towards
homeostasis. People with diabetes do not produce enough insulin, or the cells
do not recognize insulin so they cannot maintain homeostasis on their own. This
is what causes them to always have an increased blood glucose concentration.