He's been playing a lot of basketball lately and skipping meals
He's been feeling pretty tired and dizzy
He's currently suffering from Hypoglycemia which is low blood sugar levels and faints. His mum quickly wakes him up and does some research
She does some research and figures out he needs some sugar to get the negative feedback working. This helps the pancreas release glucogen (receptor) . Afterwards, the liver will release glucose (effector) raising the blood glucose levels.
She gives Riley some food and drinks high in sugar and he starts to feel better