summaries and pictures Homeostasis-Balance of body’s internal environment-Imputes and outputs • Dynamic and shifts • Regulated by the nervous system (sends nerve impulses to organs) and endocrine system (secretes hormones into blood) • Intercellular fluid (ICF)- inside the cell Extracellular fluid (ECF)- around the outside of the cell- cells need to be stable to maintain homeostasis eedback system-cycle of events where body systems are monitored. • Receptor- monitors the change and sends info to control center (afferent pathway-carried towards) are Nerve impulse or chemical charge • Control center- maintains the set point (Brain) • Effector- produces response or effect changing the controlled position and returning to stable environment • Example- body temp drops your brain (control center) sends nerve impulses (output) to your muscles (effectors) resulting in shivering, generating heat therefore raising temp • Stimulus------Receptor------Effector----Response This is negative feedback system • Negative feedback-Reverses effect of original stimulus- frequent and long term • Positive feedback- amplifies (increasing) stimulus short term- Child birth Blood clotts