Question

Открытие створчатых клапанов сердца происходит в момент:а) сокращения желудочков б) сокращения предсердийв) расслабления сердцаг) перехода крови из левого желудочка в аортуОбмен веществ происходит в: а) каппилярахб) венахв) артерияхг) лимфатических узлаВенозные клапаны:а) изменяют направление движения кровиб) подталкивают кровь к сердцув) регулируют просвет сосудов г) препятствуют обратному току крови

Answer 1

1) расслабления сердца
2) венах
3) регулируют просвет сосудов

Answer 2

Opening of Atrioventricular Valves

The opening of the atrioventricular valves of the heart occurs at a specific moment during the cardiac cycle. This event takes place during the relaxation of the heart. The atrioventricular valves open when the pressure in the atria becomes higher than the pressure in the ventricles, allowing blood to flow from the atria into the ventricles. This occurs during the diastole phase of the cardiac cycle, specifically during the atrial diastole when the atria are relaxed and filling with blood [[1]].

Metabolism Exchange Location

The exchange of substances involved in metabolism takes place in specific blood vessels. This process occurs primarily in the capillaries. Capillaries are the smallest blood vessels in the body and are where the exchange of oxygen, carbon dioxide, nutrients, and waste products between the blood and the surrounding tissues occurs. This exchange is essential for maintaining the body's metabolic functions [[2]].

Venous Valves Function

Venous valves play a crucial role in regulating blood flow within the venous system. These valves primarily prevent the backflow of blood. When functioning properly, venous valves ensure that blood flows in one direction, toward the heart, and prevents it from flowing backward. This mechanism is essential for maintaining proper circulation and preventing venous insufficiency [[3]].