Item11Item 11The main provider of energy for the brain and nervous system isMultiple Choicelactose.glucose.galactose.sucrose.

Breakdown of the Problem

1. Identify the energy substrates that are important for the brain and nervous system.
2. Determine which substance among the options serves as the primary energy provider.

Relevant Concepts

• The brain and nervous system primarily rely on certain carbohydrates as a source of energy.
• The most relevant carbohydrates to consider here are glucose, lactose, galactose, and sucrose.

Analysis and Detail

1. Glucose: This is the primary energy source for the brain.

   • It is easily transported across the blood-brain barrier and is utilized in metabolic processes to produce ATP (adenosine triphosphate), which powers cellular functions.

2. Galactose: This sugar can be converted into glucose but is not used directly as the primary energy source.

3. Lactose: This is a disaccharide composed of glucose and galactose. It must be broken down to provide glucose for energy but is not the primary energy source itself.

4. Sucrose: Another disaccharide (common table sugar) composed of glucose and fructose, and while it can provide glucose, it is not primarily used by the brain for energy in the same direct manner as glucose.

Verify and Summarize

After analyzing the glucose and its metabolic importance to the brain, it is clear that glucose is the most critical source of energy among the listed options.

Final Answer

The main provider of energy for the brain and nervous system is glucose.