Definition
This is the process by which organisms maintain stable internal conditions despite external changes.
Homeostasis
This type of diffusion involves the movement of water across a membrane.
Osmosis
This is the normal human body temperature.
37 C or 98.6 F
This type of feedback amplifies or increases a change.
Positive Feedback
This type of feedback works to reverse a change and return to normal.
Negative Feedback
This term refers to the stable internal environment maintained in the body.
Dynamic Equilibrium
If a cell is placed in a hypotonic solution, what happens to the cell?
Water enters the cell → it swells (may burst).
What process helps cool the body when it is too hot?
sweating
Positive feedback moves a system ______ from its set point.
Further Away
Negative feedback moves a system ______ the set point.
Towards
Name TWO variables that organisms regulate to maintain homeostasis.
Temperature, Water Balance, Glucose Levels, pH
If a cell is placed in a hypertonic solution, what happens to the cell?
Water leaves the cell → it shrinks.
What happens to blood vessels when the body is too hot?
Dilate or Vasodilation
This is a biological example of positive feedback involving childbirth.
This hormone lowers blood glucose levels.
Why is homeostasis important for enzyme function?
Enzymes only function properly within specific temperature and pH ranges.
Which organ in humans plays a major role in osmoregulation?
Kidneys
What happens to blood vessels when the body is too cold?
Constrict or Vasoconstriction
Explain how positive feedback works during blood clotting.
Platelets release signals that attract more platelets, increasing clot formation.
Explain how the body responds when blood sugar is too low.
Glucagon is released to increase blood glucose levels.
Explain what happens to a cell if homeostasis is NOT maintained.
Cell processes fail, enzymes denature, and the cell may die.
Explain how the kidneys help maintain water balance in the body.
They filter blood and adjust water reabsorption, producing more or less urine.
Explain how shivering helps maintain homeostasis.
Muscle contractions generate heat to raise body temperature.
Why is positive feedback less common than negative feedback in maintaining homeostasis?
Because it amplifies change and can become unstable if not stopped.
Describe the full negative feedback loop for body temperature regulation.
If too hot → sweating + vasodilation → temp decreases; if too cold → shivering + vasoconstriction → temp increases.