HB131_M1.txt

a state of body equilibrium or stable internal environment

the endocrine and the nervous systems

mechanisms used to maintain homeostasis in the body

• 1.stimulus changes e.g. rise in BP
• 2. the receptor (sensor) detects a disturbance
• 3. information is sent along the efferent pathway to the control center
• 4. information is sent along the afferant pathway to the effector
• 5. effector opposes disturbance
• 6. homeostatic equilibrium is restored

causes the variable to change in the direction oppisite to that of the stimulus. returns system back to it's ideal value

• 1. body temperature control
• 2. blood pressure control
• 3. Blood PH levels

the response or result enhances the original stimulus so that the output is enhanced.an external event is required to break the feedback loop e.g. childbirth

• 1. the receptor (sensor) detects disturbance
• 2. information is sent to the control center along the efferent pathway
• 3.information is sent to the effector along the afferent pathway
• 4.the effector reinforces the disturbance

• 1. break or tear in vessel wall initiates feedback cycle
• 2. clotting occurs as platelets adhere to site and release chemicals
• 3. released chemicals attract more platelets
• 4. clotting proceeds; newly forming clot grows
• 5. feedback cycle ends after clot seals break

• 1.cause of most disease
• 2. can lead to disease or death
• 3. may temporarily alter homeostatic equilibrium
• 4. early life disturbances can persist later in life

• 1. the realease of oxytocin when a stretch in the urterine wall muscle is detected during childbirth
• 2. the realease of chemicals and platelets to attract more platelets during blood clotting
• 3. a surge in prolactin during lactation, the infants suckling encourages milk production

37.5C

7.35-7.45

60-70 BPM

20 Breaths/min