University:
Camosun College
Course:
NURS132 | Promoting Health and Wellbeing
Academic year:

2023
Views:

382

Pages:

3
Author:

Aysha A

POSITIVE AND NEGATIVE FEEDBACK MECHANISM AIM:- To demonstrate peritive and negative feedback mechaniem. DISCUSSION:- Positive feedback In the body, positive feedback loops are often incorporated into control mechoniors in which a potentially dorngerous or stressful process must be compared quickly. For example, the immediate danger from severe cut is the loss of blood, which con lower blood pressure and reduce the efficiency of heart. Damage to the blood vessel. wall releases chemicals that accelerate the proveer Thie escalating process is a Positive feedback loop that ends with the formation of a blood clot, which patches the vessel wall and stops the bleeding... Brief principle Through intrinsic and extrinsic pathways, prothombin gets converted to thrombin Thrombin is responsible for conversion of fibrinogen to fibrin. Fibrin is incoluble and forms the threads that form the dot. Demerateration of blood clotting 1. Sterilize the finger tip and take a bold prick to have free flow of blood. 2. Absorb the fort & drops of blond on a seperate filter paper and allow a large drop to form. 3. Now dip one end of the capittary tube in the blood. the blond rises into the tube by capillary action. This can be enhanced by keeping it's open end at a lower level. 14. Gently break off Icm bits of glass tube from end, ut intervals of 30 seconds and look for the formation of fibrin thrends between the broken ends. Negative feedback It is a reaction that coures a decrease in function. It occure in response to spre kind of stormulus. Often it caused the output of a system to be lessened; so the feedback tends to stabilize the system shie con he referred to as homeostasis, as in binlogy. Biological Negative feedback Here are examples of biological negative feedback. 1. Human body temperature: The hypothalarus of a human responds to temperature pluctuations an reeports accordingly. If the temperature drops, the body shivers to bring bark the temperature and if it is too warm the body will sweat to cool down due to evaporation. 12. Human blood pressure: When blood pressure incredes, signale are sent to the brain pro the blood vessels Signals are sent to the heart from the brain and heart rate slow during thus helping blood pressure to return to normal. 3. When a human is hungry, metaboliers slows down to conserve energy and allow the humon to continue living with less food. 4. Regulation of blood sugar in humans: When blast sugar rises, insulin sends a signal to the liver, reveches and other calle to store the exceres glucose. Some is stored as body fate and other is stored glycogen in the liver and muscles. 5. Production of human red blood cells of decrease in oxygen is detected by the kidney and they secrete sajthropoetin. This harmone stimulates the productio of red blood cells. REPORT: The positive and negative feedback mechanisres were demonstrated and reported.