Biology Chapter 22-1

Biology Chapter 22-1 - Chapter 22 Section 1 Body...

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Section 1 Body Organization Imagine jumping into a lake.  At first, your body feels very cold. You may even shiver.  But eventually you get used to the cold water.  How? Your body gets used to cold water because it returns to homeostasis.  homeostasis - the maintenance of a constant internal state in a changing environment. Maintaining homeostasis is not easy. Your internal environment is always changing. Your cells need nutrients and oxygen to survive. Your cells need wastes removed. If homeostasis is disrupted, cells may not get the materials they need. So, cells may be damaged or may die. Cells must do many jobs to maintain homeostasis. Fortunately, each of your cells does not have to do all of those jobs. Just as each person on a football team has a role during a game, each cell in your body  has a job in maintaining homeostasis. Your cells are organized into groups.
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Biology Chapter 22-1 - Chapter 22 Section 1 Body...

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