Why is the reactor coolant water kept contained within the primary loop instead of allowing it to mix with the feedwater and leave through the cooling tower?

Drag each label to the correct location. claire had a heavy breakfast early in the morning. then she went to the gym to exercise. after the gym, claire went to class. while exercising, the body requires a continuous supply of energy and uses up blood sugar at a faster rate. how will hormones maintain the sugar balance in the body from breakfast until claire has lunch?