What kinds of animal experiments are there?

Acute experiment: an experiment in which living animal specimens or whole animals are taken as the experimental objects, the experimental conditions are artificially controlled, the specific physiological activities of animal specimens or whole animals are observed and intervened in a short time, and the experimental results are recorded as the basis for analysis and inference. It can be divided into in vivo experiment and in vitro experiment.

Disadvantages: It is usually harmful or even fatal.

In vivo experiment: observation or experiment on anesthetized or awake animals.

Advantages: the conditions are easily controlled and the experiment is simple.

In vitro experiment: the study of separating organs or cells from the body under certain experimental conditions.

Advantages: it is beneficial to eliminate the influence of irrelevant factors.

Disadvantages: The results obtained may not necessarily represent the overall activity under natural conditions.

Chronic experiment: An experiment that takes an intact and sober animal as the research object, makes the animal's external environment as close as possible to the natural normal state, and repeatedly observes the functional activities of some organs or the changes of physiological indexes in the intact animal for a period of time.

Advantages: closer to the overall physiological function activities.

Disadvantages: the experimental conditions are demanding, the time is long, the overall conditions are too complicated, and there are many influencing factors, so the results are sometimes difficult to analyze.