Fu organs, called fu in ancient times, have the meaning of bitter fu. The main physiological functions of the six fu-organs are to receive and decompose Shui Gu, secrete turbid qi, transmit essence, and expel the dregs from the body without leaving them. Therefore, the six internal organs should be harmonious and unobstructed. Traditional Chinese medicine has six fu organs: stomach, large intestine, small intestine, bladder, pericardium and triple energizer. The physiological functions of the six fu-organs are as follows: food enters the stomach, decays through the stomach, goes down to the small intestine, is further digested, secretes turbid substances, absorbs subtle substances, the large intestine receives food residues in the small intestine, absorbs water, and the rest residues are discharged from the body through drying and conduction, becoming feces. In the process of digestion and absorption of food and drink, gallbladder excretes bile into small intestine to help digestion. The triple energizer is not only a conduction channel, but more importantly, it controls qi and promotes normal conduction function. The six fu organs cooperate closely in physiological functions to complete the digestion, absorption, transportation and excretion of food and drink. They interact in pathological changes. If one viscera is ill, it can affect other viscera and cause disease. If there is excess heat in the stomach, excluding body fluid can make the stool dry and the large intestine conduction is unfavorable. Poor conduction in the large intestine will affect the acceptance of the stomach, resulting in poor intake and abdominal distension.
There are also peculiar and constant viscera: brain, marrow, bone, pulse, gallbladder and daughter cells. Strange and unchanging, different from usual. Brain, marrow, bone veins, gallbladder and daughter cells are all organs that store yin essence, just like viscera and viscera, so they are called "strange and constant viscera".
Also, the sentence you mentioned comes from the classic "Su Wen Pulse to Subtle Theory": "The husband of the five internal organs has a strong body. The head is a smart house, and the deep spirit will be taken away. If you hold the mansion on your chest and bend your back with your shoulders, it will be broken. The waist is the house of the kidney. If it doesn't turn around, the kidney will be useless. Knee is the mansion of tendon, but you can't bend and stretch, and you will be tired when you walk. Bones are the marrow of a house. If you can't stand for a long time, the thread will shake off and the bones will be exhausted. Strong is born, weak is dead. "