Chloroplast.
A carbohydrate is a complex molecule of carbon, hydrogen, and oxygen found in all living organisms. These molecules store energy. All heterotrophs need carbohydrates for the energy they need to survive. Autotrophs make carbohydrates through photosynthesis or other processes.
The process in which autotrophs use light energy to make carbohydrates is called photosynthesis. Chemosynthesis is the process by which some organisms use chemical energy to produce carbohydrates.
photosynthesis
Carbohydrates will give you energy with which to do your exercise, but the muscle itself is made from protein.
Carbohydrates are digested to give us energy to make us able to do daily activities.
photosynthesis
Calvin Cycle
First, energy from the sun is used to combine CO2 and water to make carbohydrates. The carbohydrates have stored energy that is released when the carbohydrates are broken down. When animals eat the plant and break down the carbohydrates, they receive energy. In turn, carnivores that eat those animals receive energy from the fats and proteins in their prey.
We need protein to form the main structural parts of the body cells, we also need it for growth and repair. We need carbs for energy(they are the easiest sorce), we need fats also for their richness in energy, they are also part of cell membranes and important in nerve tissues.
Muscle cells use triglycerides for energy instead of carbohydrates because triglycerides make energy for storage, insulation, and organ protection
The nutrients that serve as the main sources of energy for the body are carbohydrates. The body uses the carbohydrates to make glucose which is the basic functional molecule of energy in cells.
Plants use light as their source of energy to make carbohydrates such as sugars.