Question

1.When you start to exercise, your muscles need more oxygen. Your body has chemoreceptors that detect the need for more oxygen and accelerate the respiration rate and the cardiovascular output. So both breathing and hear rate increase as your exercise intensity increase. This is an example of: positive or negative feedback?

2. When a capillary is damaged, a platelet plug is formed. The process involves platelets sticking to each other. The more platelets that stick together, the more the plug attracts additional platelets. This is an example of: positive or negative feedback?

Answer 1

Positive and negative feedback is a type of one general reaction between reactant and product. We know that in a reaction there is a increase in number of product or it decrease also which is due to positive and negative feedback.

In your first case of exercise, it is a e.g. of negative feedback, because of your exercise body temperature increased, contractions of muscle increases and many more. This is unstable condition and to put it back body must adopt stable phenomenon means sweating and others.

In your second case is a.e.g. of positive feedback, because here our product is increasing as there increase in platelet concentration and out end product is blood clot.