Body Systems Work Together

A. Homeostasis: a process where the body keeps things the same.

1. The senses in the nervous system receives feedback from the environment inside the body ( salt, glucose, hormones, water) and outside the body (temperature), and reacts to it.

B. Systems Working Together

1. Respiratory and Circulatory work together to move oxygen into cell and carbon dioxide out of cells.

2. Digestive and Circulatory work together to break down foods and bring nutrients to all cell.

3. Nervous and Muscle work together by sending signals based on the senses to contract muscles and move.

4. Nervous and Endocrine work together by reacting to a stimulus in the body, and signaling a response, like sugar level, water level, calcium level, growth, or sleep.

C. Homeostasis of blood Glucose

D. Feedback Loops allow the body to maintain homeostasis.

1. Positive feedback loops are where the increase in temperatures outside, cause in increase in sweat. Both increases!!!

2. Negative feedback loops are where an increase in leptin hormones causes a decrease in appetite sensation.

D. Negative Feedback Loop1. The Endocrine system contains a gland called the hypothalamus, which releases a protein hormone, leptin.2. Leptin is released by fat cells as they are filled up with extra fat. 3. Leptin goes into the blood to the brain.4. The brain turns down the appetite center, and you won’t feel hungry.

E. Hormones in the Menstrual Cycle

• Paste Diagram

• Looking at day 1 to day 14, decide if this is a positive feedback loop or a negative feedback loop. Explain it.