Does our brain get tired like our muscles?

Fatigue of muscles can be defined as decreased ability to produce power. Muscles consume 100 times more energy than resting state during an intense activity. The depletion of the resources that supply energy and the accumulation of substances formed as a result of the mechanisms by which energy is obtained prevents the muscles from contracting sufficiently. However, our brain is among the factors that determine the endurance limit of our muscles. Muscle contraction stimulation is sent by the brain through nerve cells, and these cells control the frequency and strength of muscle contraction. Insufficient power of the signals transmitted by nerve cells or the inability of the signals to reach the muscle cells causes the muscles not to contract sufficiently. Fatigue in our muscles may be the cause of our fatigue.

We feel mentally tired after an exam we have entered or when we have to make a difficult decision, that is, when we think about a certain subject for a long time. Although our brain makes up 2% of our total body weight, it uses 20% of the total energy our body consumes. So our brain is a hard working organ. Research shows that the brain spends more energy in decision making. When people focus on a particular subject, they tend to ignore other warnings from outside. That's why some scientists think that our brains are becoming more inefficient when they work hard like our muscles.