Pulmonary valve

The pulmonary valve (PVA) is one of the key elements of the circulatory system and plays an important role in maintaining normal lung function.

The pulmonary valve is a valve located in the right ventricle of the heart and regulates blood flow between the lungs and other parts of the body. Due to the presence of the valve, blood cannot flow in the opposite direction from the lungs to the heart. In addition, the CPA prevents the backflow of blood from the left ventricle into the lungs. Malfunction of the coronary artery can lead to various diseases of the lungs and other organs of the cardiovascular system.

The process of formation of CPA begins in the womb, when the blood supply to the lungs is formed. The pulmonary valve is a key element of the pulmonary valve and is formed due to the tight fit of the vesicular valve plate.

A normal pulmonary valve consists of three layers. The inner layer is connective tissue that provides attachment of the coronary artery to the wall of the blood vessel. The second layer is a two-layer cylindrical valve, consisting of two flaps connected in the center, and containing longitudinal and transverse folds. The outer layer is a muscular layer with smooth muscles, which is necessary for regulating blood flow. During contraction of the muscles located on the outer surface of the muscle layer, the CPA opens and closes.

**Acidic metabolic products** are the end products of the breakdown of high-energy nutrients. During its digestion, the human intestine releases the following **acidic products**: lactic acid, ammonia, carbon dioxide, amines, hydrogen sulfide, methane, hydrogen, acetone, etc. (Table 26).

**The acidic nature of food is provided by B vitamins, vitamins PP, C, H, K and folic acid**, as well as **amino acids (tryptophan, leucine, lysine, arginine), carbohydrates and proteins**.

In the human body, free (not bound to proteins) acidic forms of group B are regulators of blood sugar levels. The biological value of milk is determined by the presence in it of proteins (about 2.8-4%), fats (about 3.2-3.7%) and carbohydrates (4.7-5.1%), minerals, and vitamins. Milk proteins contain all essential amino acids in the required proportions close to the body's needs. Sugar (lactose) is the main source of energy for humans and enters the body with milk. Another source of sugars for a healthy person is plant foods (fruits, vegetables, grains, legumes). Cow's milk carbohydrates are well absorbed from the intestines and provide energy to the digestive tract. Several forms of vitamin B12 have been identified. Cyanocobalamin enters the human body along with food, and is also formed in the human large intestine if there is normal microflora in it. Vitamin B