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the regulation and maintenance of the internal environment within the narrow ranges that support human life
homeostasis
information from sensors that allows a control center to compare current conditions to set of ideal values
feedback
a control system counteracts any changes in the body that moves conditions above or below a set point
negative feedback
a control center uses information from sensors to increase the rate of change away from the set point
positive feedback
What are the 4 parts that work together to form a system to maintain homeostasis
sensors, control center, communication system, and targets
What is the other name for sensors
receptors
What do sensors do
they gather information about conditions inside and outside of the body
What does the control center do
receives information from the sensors and compares this information to the set points at which the body functions best
What do the communication systems do
carry messages to all parts of the body
What are the communication systems controlled by
the nervous system and the endocrine system
What do targets do
any organ, tissue, or cell that changes its level of activity in response to a message
What are the things that are controlled by homeostasis
temperature, pH levels, salt, nutrients, fluids, and gases
What do internal systems do in homeostasis
respond quickly to change
What range should body temperature be in
98.2-98.8
What body temperatures is dangerous for the body and why
-106 degrees because it causes enzymes to stop functions
-below 80 degrees because it can cause heart failure
What can happen if mineral levels are too low
irregular heartbeat
What can happen if mineral levels are too high
coma
What is a feedback loop
the information from one sensor allowing the control centre to compare current conditions to a set of ideal values
What are the 2 types of FBLs
Negative feedback loops and positive feedback loops
What does a negative feedback loop help do
keep the environment stable
What are necessary for homeostasis
FBL
most functions in the body are regulated by what
a negative FBL
Which FBL is less common
positive FBL
When are positive FBLs important
when rapid change is needed in the body
What does the body need to change for
to accomplish a specific task
