Homeostasis
{or maintaining balance in living systems.
Homeostasis literally means SAME STATE
•
Homeostasis refers to the body’s constant
struggle to keep all of the internal functions
balanced
• The endocrine (hormone) and nervous
systems are continually working to keep the
body’s environment steady
Examples of how organisms maintain
homeostasis.
1)
Body’s thermostat – sweating when it is too hot
or shivering when it is too cold
2)
Unicellular organisms – pumping out water
through their organelles when there is too much
Ex: Contractile vacuole in protists pump
out excess water.
Breathing Lab
DETERMINE THE BREATHING RATE OF YOUR PARTNER
Count for 15 seconds: _____* 4 = breaths per minute
Would you expect the rate to increase or decrease after exercise? Why
or why not?
Breathing Lab
HAVE YOUR PARTNER DO JUMPING JACKS FOR 1 MINUTE
Re-measure their breathing rate.
Count for 15 seconds: _____* 4 = breaths per minute
Would you expect the rate to increase or decrease after sitting for 3
minutes? Why or why not?
Breathing Lab
RE-MEASURE THEIR BREATHING RATE AFTER SITTING FOR 3 MINUTES
Count for 15 seconds: _____* 4 = breaths per minute