It is because Galen based his information about anatomy on what he had found out during dissecting the bodies of animals. This created mistakes on his claims in human anatomy. Some of these anatomical errors were the following:
1. He thought muscles are attached to the bone just like in dogs.
2. He thought that the liver produces blood. He then realized that it flowed around the body, but he claimed that is burned fuel for the muscle.
3. He thought that there are holes through the septum, which allowed the blood to flow from one side to another of the heart.
4. He thought that there are blood vessels in the brain.
5. He thought human’s jaw was made up of two bones just like a dog’s.
6. He made mistakes about the liver’s shape.
Optimal level of arousal is the correct answer.
Each person has a different level of arousal and this level is perfect for them. In order to maintain this level, people will seek for activities that promote their own stimulation. In this case, Joel got his arousal elevated when he went out partying/clubbing, while Natalie was happier when she was able to stay home and read her mystery novels. Thus, their relationship was unlikely to succeed since their optimal arousal level was out of sync.
