Explanation:
The four types of temperaments are:
Sanguine - Optimistic type, carefree, loves adventures, high-risk tolerance
Phlegmatic - They are avoiding any conflict and they tend to be good with everyone and have good relationships; harmony, peace
Melancholic - Love traditions, not adventures, love being in a community, social
Choleric - Goal-oriented, logical, deep, and meaningful conversations, friendly
Chloric and Sanguine types are similar and also Phlegmatic and Melancholic types are similar. The contrast between them is that for phlegmatic and melancholic persons their priorities will always be love, peace, family, and harmony while sanguine and chloric type are the ones who will rather follow their career.
Phlegmatic and melancholic differ in some things such as: melancholic type loves to be in one community and they are more traditional people than phlegmatic ones.
Differences between choleric and sanguine is that sanguine loves adventure more than choleric and choleric type is more goal-oriented.
I think the answer is nervous system and muscular system work together but i could be wrong.
