Homeostasis

receptor

- / components of homeostatic mechanisms - senses the environment, responds to changes (stimuli) The sensor then sends this information (input) to a control center.

-ve feedback

- components of homeostatic mechanisms/ effector - decreases stimulus/ response - depress stimulus

+ve feedback

- components of homeostatic mechanisms/ effector - increases stimulus/ response - make it continue at faster rate

control center

- components of homeostatic mechanisms/ receptor - input flows from receptor to control center along the afferent pathway -processing, integration take place - determines the set point which is the level/ range at which the variable being regulated should be maintained - input is analyzed, appropriate response is made - info flow from the control center to the effector is called the efferent pathway

endocrine sys n homeostasis?

- essential 4 homeostasis/ comm w/ in body - releases hormones which circulate throughout the body contacting every cell - slow in onset, longer in duration vs. nervous sys

nervous sys n homeostasis?

- essential 4 homeostasis/ comm w/ in body - uses electrical impulses which are rapid, very specific and are short-term

hormones

- essential 4 homeostasis/ comm w/ in body /endocrine sys - blood borne chemical messengers

homeostasis

- homeo = unchanging + stasis = standing - foundation of physiology

feedback loop

- homeostatic mechanism illustrated 1. teeter-totter (variable) in balance 2. stimulus: produces change in variable 3. change detected by RECEPTOR 4. input: info sent along afferent pathway to CONTROL CENTER 5. output: info sent along efferent pathway to EFFECTOR 6. response to effector feeds back to influence magnitude of stimulus, returns variable to homeostasis (balanced teeter-totter)

efferent pathway

- info flow from the control center to the effector - leaving the control center travels along the efferent pathway - e for efferent; e for exits

afferent pathway

- input flows from receptor to control center - info traveling along the afferent pathway approaches the control center - a for afferent; a for approaches

reciprocal communication within the body

- nervous and endocrine systems adjust the activities of multiple organ systems in response to the demand/change put on body - all organ systems play their role in maintaining homeostasis - nervous and endocrine sys r the ultimate regulators

effector

- responds to the commands of the control center - produces the appropriate response - result of response then "feeds back" to influence the stimulus : decreas it (-ve feedback) /increase it (+ve feedback).

homeostatic regulation

- the body's ability to maintain relatively stable internal conditions tho the outside world changes continuously - a dynamic equilibrium / balance btw all the cells of the body as they make continuous adjustments in response to changing internal and external situations

components of homeostatic mechanisms (list)

1. receptor 2. control center 3. effector

information of stimuli

input

essential for homeostasis

reciprocal communication within the body

environmental changes

stimuli