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homeostasis & feed

homeostasis & feedback

QuestionAnswer
what does homeostasis control Temperature, blood flow, heart rate, ph, 02 C2 H20 level, glucose level
what is internal environment The fluid environment that surrounds the body’s cells - intercellular fluid
what is homeostasis Maintenance of a constant internal environment Nervous & endocrine system work together to keep the condition in the body/cell steady for optimum functioning Optimal not constant Big external changes are monitored & responded to, ensure minimal change experienced by body cells
Why 2 systems Nervous - immediate changes as suboptimal conditions can be life threatening Endocrine - other conditions need slower/more broad/longer lasting changes
what does a feedback system/loop do Detect conditions change Decide & control what to do about it Produce an effect to address the change
two feedback responses Negative - alters/reduces stimulus - common / yes homeostasis - steady state control system Positive - amplifies/reinforces the stimulus - rare (no homeostasis) - oxytocin/birth
receptor a structure that detects a stimulus
modulator a control centre responsible for processing information received from a receptor and for sending information to the effector
stimulus any change, internal or external, that causes a response
effector motor neuron - a nerve cell that carries messages from the brain or spinal cord to effector organs
tolerance limit the limit of factors (temp, fluid balance) beyond which the body malfunctions
set point the level at which a variable is to be maintained
Created by: wegonebefine
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