HOMEOSTASIS EQ HOW DOES YOUR BODY MAINTAIN HOMEOSTASIS

HOMEOSTASIS EQ: HOW DOES YOUR BODY MAINTAIN HOMEOSTASIS?

ORGANIZATION OF LIFE • • Molecule: chemical made from atoms Organelle: a part of a cell Cell: the basic unit of life Tissue: group of cells working together for 1 function • Organ: a group of tissues working together • Organ system: a group of organs working together • Organism: a multicellular living thing

HOMEOSTASIS • Homeostasis is the body’s ability to maintain relatively stable internal conditions though the outside world is continuously changing. • Maintaining homeostasis is your body’s full time job! Even while you’re asleep.

• It is a dynamic function of your body meaning that it is always changing. • In your notes, draw a picture that comes to mind when you think of homeostasis, and list an example of how your body does this.

FEEDBACK MECHANISMS • There are two different feedback mechanisms. Negative and positive feedback mechanisms. • Negative feedback is a reaction that causes a decrease the stimulus. • Positive feed back causes a reaction that increases the stimulus.

NEGATIVE FEEDBACK MECHANISM • Negative feedback mechanisms are much more common in nature than positive. • Included in these are internal temperature control and blood pressure.

POSITIVE FEEDBACK MECHANISMS • They are much more rare in nature because they tend to increase the sensation • They typically control infrequent events that occur explosively in the body • Examples include birthing a child, and blood clotting.