Introduction to the Human Body How Does Your Body Stay in Balance? Ms. De Los Rios 6h Grade 11.3 Homeostasis Essential Question: How Does your Body Work? How Does Your Body Stay in Balance? Pgs. 418-425

Vocabulary 11.3 Homeostasis- Condition in which an organism’s internal environment is stable in spite of changes outside the environment Stress-is the reaction of your body to threatening, challenging, or uncomfortable events.

Stress and Catching a Cold Homeostasis pg. 418 Stress and Catching a Cold In the 1980s, scientists began to gather evidence that stress can affect the immune system. Summarize the information given in the graph. _____________________________________________________________________________________________ What do you do to manage stress?

How Does Your Body Stays in Balance? Pg.419 Although conditions outside the human body may change, conditions inside the body stay stable. conditions such as: chemical makeup of the cells their water content body temperature. The condition in which an organism’s internal environment is kept stable in spite of changes in the outside environment is called homeostasis. Homeostasis is necessary for an organism’s proper functioning and survival.

How Does Your Body Stays in Balance? Pg. 420 All of your body systems working together maintain homeostasis and keep the body in balance. Body reactions that maintain homeostasis in the face of changes in external conditions include: shivering being thirsty. sweating being hungry The nervous and endocrine systems respond to a change in the body’s internal environment and control the responses. They also signal other body systems to play a role in the response. Homeostasis is NEVER the responsibility of only one system; it relies on the interaction of many body systems.

Homeostasis and Regulating Temperature Homeostasis pg. 420 Homeostasis and Regulating Temperature Homeostasis keeps the body and its outside environment in balance.

Fig. 2 Homeostasis pg. 420 Meeting Energy Needs What are the signals between the nervous system and the digestive system that control feelings of hunger?

Meeting Energy Needs pg. 420,21 Energy needed= ES hormones to NS to make you feel hungry. After you eat, ES hormones to your NS (brain) to make you feel FULL!! Other systems are involved such as: Muscle system= move food in your DS Respiratory system= takes oxygen to cells so that they can make energy.

Relate Cause and Effect Maintaining Water pg. 421 Life depends on water. In order for chemical reactions to take place within your body, water is required. If body needs water= you become thirsty Once water is ingested passes from the Digestive S. into your Circulatory S. Excess water leaves your body through the excretory system Relate Cause and Effect Complete the cause-and-effect table.

How you are able to keep your balance: Keeping Balance pg. 421 Hearing = Ears Ears = Balance How you are able to keep your balance: Structures within your ears sense the position of your head. Information is sent to your brain Brain interprets/understands information If losing balance, the brain sends message to your muscles to move in ways to keep you steady/balance.

How Does Your Body Stays in Balance? Pg. 422,23 Stress is the reaction of the body to possibly threatening, challenging, or uncomfortable events. Some stress is normal and healthy, and once the stress is over, the body returns to a healthier condition. However, too much negative stress can be unhealthy. Things that disrupt homeostasis: Homeostasis can be disrupted by ongoing stress. Thus, managing stress is important to having a healthy lifestyle. Bacteria and viruses can upset homeostasis and make a person sick. The body’s immune system helps fight disease.

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