The answer is "wound healing." In negative feedback systems, the product of the process will inhibit the process when it reaches a certain level. This is true whether that product is the actual product of an enzymatic reaction, or just a change in body temperature, blood sugar levels, or blood pH. This is because all of those processes are working to stay at a fairly precise level to maintain homeostasis. Wound healing, however, involves positive feedback. Platelets attract more platelets and induce other factors in the healing response.

Diabetes mellitus type II is when the cells do not uptake glucose from the blood in the presence of insulin. Exercise allows the activation of GLUT4, which results in glucose uptake from the blood without the need of insulin.

The GLUT1 transporter is a uniport member of the major facilitator superfamily. Glucose flux varies depending on glucose concentration as the transporter approaches maximum saturation. This, along with competitive inhibition, indicates mediated transport in GLUT1.

Hemoglobin exhibits cooperative binding, so each oxygen atom which binds allows the following one to bind with more ease (for a maximum of four). Hemoglobin unbound is initially in the tense (T) state, which contains 8 ionic bonds. These bonds cause the irons atom of the heme groups to be relatively non-planar with their surrounding protoporphyrin rings, which is less stable than them being planar. Each oxygen which binds causes 2 of these ionic bonds to break, allowing the iron atom to become more and more planar upon binding more oxygens. By the time four oxygens are bound, all 8 bonds have been broken and the hemoglobin is in its fully relaxed state, with the iron atoms stably planar with their rings.

A zymogen is a protein which is released as an inactive precursor and then requires some kind of modification (such as cleavage, hydrolysis, etc.) to become activated. An example is pepsinogen, which is released by chief cells in the stomach in an inactive form, which is then activated to become pepsin by hydrochloric acid in the stomach. Pepsin catalyzes breakdown of consumed proteins. All of the other answers are incorrect.

3-hydroxybutyrate is a ketone body, which accumulates as a result of an increase of glucagon. Increased glycogen synthesis, decreased glycogenolysis, and action of hormone-sensitive lipase are all results of an increase in insulin levels. 

In a hypertonic solution, the net flow of water will be from the cell into the environment, the process will cause the cell to lose water and shrink. This will be passive requiring no energy. In plant cells it is called plasmolysis, and in animal cells it is called crenation.