Homeostasis Flashcards
define cells
the constancy of the internal environment is the condition for free life
define the internal enviroment
is the ECF in which the cells live a secluded life protected from the vicissitudes of a sometime hostile external environment
what meant to be constant in the internal environment?
properties and composition
define homeostasis
refers to the body’s ability to maintain as stable internal environment
what does homeostasis regulate?
hormones, body temp, water balance
what is the role of the control centres
Control centres in the brain play roles in regulating physiological parameters and keeping them within the normal range.
where will you find the control centres?
in the brain
define feedback loop
As the body works to maintain homeostasis, any significant deviation from the normal range will be resisted and homeostasis restored
what are the 3 basic components of a feedback loop?
sensor/receptor
control centre
an effector
what is the role of the sensor in the feedback loop?
monitors a physiological value, responsible for detecting a change in the environment which is reported to the control centre.
what is the role of the control centre in the feedback loop?
compares the value to the normal range, if the value deviates too much from the set point, then the control centre activates an effector
what is the role of an effector in the feedback loop?
causes a change to reserve the situation and return the value to the normal range
what are types of effectors?
muscles and glands
what are the two types of feedback loops?
negative and positive
what is a negative feedback?
is a mechanism in which the effect of the response to the stimulus is to shut off the original stimulus or reduce its intensity
