Question

1. the brain makes up about 2% of our body weight. approximately what percentage of the bodys energy does it use?

○ 2%
○ 5%
○ 10%
○ 20%

1. what macronutrient building block is used to create neurotransmitters?

○ glucose
○ amino acids
○ fatty acids
○ triglycerides

Explanation:

Question 1

Step1: Recall brain energy usage

The brain, though 2% of body weight, uses about 20% of the body's energy (from glucose, mainly). The options include 2%, 5%, 10%, 20%.

Step2: Select correct percentage

From knowledge, the brain's energy usage percentage is around 20%.

Neurotransmitters are made from amino acids (precursors like tryptophan, tyrosine, etc. are amino acids). Glucose is for energy, fatty acids and triglycerides are for fat - related functions, not neurotransmitter building.

Answer:

20% (the option with "20%")

Question 2