In an endothermic reaction, the opposite happens. In this reaction, heat is absorbed. Or more exactly, heat is required to complete the reaction. Photosynthesis in plants is a chemical endothermic reaction. In this process, the chloroplasts in the leaves absorb the sunlight.
Martial arts. Martial arts are codified systems and traditions of combat practices, which are practiced for a number of reasons: as self-defense, military and law enforcement applications, mental and spiritual development; as well as entertainment and the preservation of a nation's intangible cultural heritage.
Return to Top. 1  Mixed martial arts contests and exhibitions may be held in a ring or in a fenced area. 2  A ring used for a contest or exhibition of mixed martial arts must meet the following requirements: 3  The ring must be no smaller than 20 feet square and no larger than 32 feet square within the ropes.