Lipids
bones
Carbohydrates is the preferred fuel.
depends on the type of engine, not the body
Initially, 5 billion years ago, a large collection of Hydrogen gas accumulated over time to form a large body of gas. When temperature gets extremely high in the core of this body, nuclear fusion starts, using the gas as fuel. So, there was already gas in the first place, and the star dies when this fuel runs out.
Carbon dioxide
The digestive system provides fuel for the body in a form it can use.
To provide fuel for the body in the form of glucose.
Lungs provide the body with oxygen. Oxygen is not exactly a fuel, but oxygen is necessary in order to burn fuel. Fuel for the body comes in the form of food, and oxygen is necessary to metabolize the food.
You can buy energy in different forms; for example, in the form of food, four our body's energy needs; in the form of different types of fuel, such as gasoline for a car (food can be considered fuel for our body); or in the form of electrical energy, which comes to our homes.
There is some debate as to whether carbohydrates or fats are the body's preferred fuel. However, the body will burn carbohydrates in the form of glucose before it burns fat.
EFI is electronic fuel injectionMPFI is multi port fuel injection.MPFI is a form of EFI so there is no real answer.There is also TBI, throttle body injection.EFI is electronic fuel injectionMPFI is multi port fuel injection.MPFI is a form of EFI so there is no real answer.There is also TBI, throttle body injection.
Protein
it carries fuel in the form of liquid
The preferred fuel source for the body is glucose.
For the body to function it needs energy, even at rest. Energy comes from food that we eat, in particular carbohydrate which is stored in our muscles, and in liver cells in the form of Glycogen. Glycogen is broken down to glucose, the fuel that can be used by all tissues in the body.
The fuel does not go to the throttle body it goes to the fuel injectors.
Fuel in an evaporated form.