6A- Introducing Homeostasis Flashcards
(24 cards)
Definition of Hypothalamus
Plays a major role in maintaining an organisms stable internal body temperature
What is a positive feedback system
Occurs when the response increases the initial stimulus
What is a negative feedback system
Occurs when the body’s response to the stimulus attempts to reverse the effect of the stimulus to return it to its set point
Definition of Oxytocin
A natural hormone that manages key aspects of the female and male reproductive system, as well as aspects of human behaviour
Definition of Pituitary gland
It tells other glands in your body what to do
Where is the pituitary gland?
Found at the base of your brain, in line with the top of your nose
What is homeostasis?
The maintenance of a stable internal environment in the body, despite changes in the external environment, so that cells can function properly
Optimal internal temperature
36.5 oC - 37.5 oC
Optimum pH
7.35 - 7.45
Sodium concentration (mmol/L)
135 - 145 mmol/L
Potassium concentration (mmol/L)
3.5 - 5.0 mmol/L
Whats stimulus?
change in external or internal environment
Whats a receptor?
Stimulus is detected by a receptor
Whats a modulator?
Information from the receptor is relayed to the brain
Whats a effector?
Information from the modulator is relayed to the organ for a response
Whats a response?
Response to stimulus
What is a stimulus response model?
the compatibility between the stimulus presented to an individual and the response generated in reaction to i
Thermoreceptors?
Detect changes in temperature
Nociceptors?
Detect painful stimuli
Baroreceptors?
Detect changes in pressure /mechanical changes
Chemorecpetors?
Detect changes in chemical concentration
Photoreceptors?
Detect changes in light
Example of a negative feedback system
The set point for the temperature is 37oC. The stimulus detected is an increase in temperatures and the response is to sweat evaporation from the skin and decrease body temperature
Example of a positive feedback system
Labor contractions increasing the diameter of the cervix for birth
