Homeostasis and Feedback
A thermostat is an example of what kind of feedback?
Negative
The response of the effector is to lessen or end the original stimulus
Negative feedback
This is the "normal" value for a specific body condition
Set Point
Homeostasis is the condition in which the body maintains:
A relatively stable internal environment, within limits
Homeostasis is
A state of balance in which the body's internal environment remains in the normal range.
Which way does an afferent pathway lead?
Away from the receptor Towards the control center
Effectors
Cause responses that alter conditions in the internal environment.
Positive Feedback
Changes cause additional similar changes.
In a feedback loop, what would the brain be an example of?
Control center
In a feedback loop, what would the central nervous system be an example of?
Control center
In a feedback loop, what would the hypothalamus be an example of?
Control center
In a feedback loop, what would the spinal cord be an example of?
Control center
In the hypothalamus, this area contains a set point and analyzes information to decide what should be done in response to a stimulus
Control center
This area contains a set point and analyzes information to decide what should be done in response to a stimulus
Control center
Is homeostasis a static state or a dynamic state (within limits)?
Dynamic, within limits
In a feedback loop, what would glands be an example of?
Effectors
In a feedback loop, what would muscles be an example of?
Effectors
Negative Feedback
Maintains homeostasis (ex: thirst, respiration, body temperature)
Homeostatic Mechanisms do what?
Monitor aspects of the internal environment and corrects any changes.
What are the two types of effectors?
Muscles and glands
Increasing amounts of calcium in the blood causes more bone to be produced, decreasing the amounts of calcium in the blood. + or - feedback?
Negative
Increasing amounts of fluids in the blood causes more urine to be produced, decreasing the amounts of fluids in the blood. + or - feedback?
Negative
Shivering when you are cold is an example of _____feedback
Negative
Shivering when you are cold is an example of what kind of feedback?
Negative
Sweating when you are warm is an example of _____feedback
Negative
Sweating when you are warm is an example of what kind of feedback?
Negative
What kind of feedback lessens or ends the stimulus?
Negative
______feedback mechanisms keep changes within the body rather small.
Negative
______feedback mechanisms work to prevent sudden severe changes in the body.
Negative
The response of the effector is to lessen or end the original stimulus in:
Negative feedback
Blood clotting is an example of ___ feedback
Positive
Blood clotting is an example of what kind of feedback?
Positive
Immune response is an example of ___ feedback
Positive
The birth of a baby is an example of what kind of feedback?
Positive
The increased stretch of the uterus forces it to contract, which causes more stretch. Positive or negative feedback?
Positive
What kind of feedback enhances the original stimulus or magnifies the change?
Positive
What kind of feedback usually damages the body (except two cases)?
Positive
the increased stretch of the uterus forces it to contract, which causes more stretch. Positive or negative feedback?
Positive
Receptors
Provide information about specific conditions (stimuli) in the internal environment.
What are the five components of a feedback loop?
RACEE- (sensory)receptor, afferent pathway, control center, efferent pathway, effector
In a feedback loop, what would the eye be an example of?
Sensory receptor
In a feedback loop, what would the nose be an example of?
Sensory receptor
In a feedback loop, what would touch and temperature sensors of the skin be an example of?
Sensory receptors
The hypothalamus contains these for many body functions.
Set point
Set Point
Tells what a particular value should be.
Which way does an efferent pathway lead?
Towards the effector Away from the control center
Which type of pathway leads away from a sensory receptor?
afferent
Which type of pathway leads towards a control center?
afferent
Which type of pathway leads away from a control center?
efferent
Which type of pathway leads towards an effector?
efferent
What are some examples of sensory receptors?
eye, ear, tongue, nose, touch and temperature receptors in the skin
