Homeostasis (chapter 30) Flashcards
External Environment
The external environment surrounds the outside of an organism
Internal Environment
The internal environment surrounds the cells in an organism
Homeostasis
Homeostasis is the ability of an organism to maintain a constant internal environment.
Name two waste products that have to be removed, where they are produced and how they are removed.
CO2- produced by respiration, removed via lungs.
Urea- Produced by liver breaking down amino acids, removed by kidneys and transferred to bladder.
Name four Internal conditions that need controlling
Temperature, Ion Content, Water content, Blood glucose
How is temperature controlled
Increased by shivering, lost by sweating
How is Ion content controlled?
Increased by eating, lost by sweating and urine
How is water content controlled
Increased by drinking, lost by sweating and urine
How is blood glucose controlled
Increased and decreased by hormones.
Negative Feedback
Most homeostatic mechanisms work by negative feedback, if there is a change away from the normal optimum value, action is automatically taken to reverse this change
Term to describe a warm blooded creature
endotherm
term to describe a cold blooded creature
ectotherm
