G Read the article below and complete the notes. Write no more than three words in each gap.1. The ‘pleasure centre’ of the brain acts as a kind of ..........................______ ...................................in thebody.2. When animals take exercise or feed,..............................................______ ................................... into the body, making them want to repeat the process.3. On the negative side, ‘pleasure centres’ send out these chemicals for .................______ ...........................................................reasons.4. The .................................______ .....................................of the junk-food eating rats was double that of those on a nutritious diet.5. In the experiment all the rats were given a ....................................______ ....................................to their brains’ pleasure centres when they ran.6. The results showed that rats on a healthy diet required................................______ .............................. than those on a junk food diet.7. The junk food eating rats would not accept........................................______ ........................................... when they were deprived of their high calorie diet.