If a person is feeling dizzy, glucose or fruit juice is given immediately but not a cheese sandwich, which might have more energy. Explain.
Because under natural conditions only carbohydrates are used as respiratory substrates. This is also called floating respiration. Glucose and fruit juices contain carbohydrates which are able to provide ATA.
The glucose as absorbed and reaches blood, giving instant energy.Whereas, cheese sandwich will repuire time for digestion, and absorption. Sick person requires immediate energy supply, so glucose or fruit juices contanis glucose are given to them.