Question

Как движется кровь по венам? Пожалуйста можно помогите мне?(

Answer 1

Ответ:

вроде так,насколько я поняла вопрос

Объяснение:

Движение крови по венам осуществляется благодаря присасывающему действию сердца и тому, что в грудной полости каждый раз во время вдоха возникает отрицательное давление из-за разности давления в полостях, сокращению мускулатуры органов и ряду других факторам.

Answer 2

Ответ:

с помощью сердца

сердца придставляет сабой насоч

Answer 3

How does blood move through veins?

Blood moves through veins in a process called venous circulation. Venous circulation is driven by several mechanisms, including the contraction of skeletal muscles, the presence of one-way valves in the veins, and the pressure changes that occur during breathing.

1. Contraction of skeletal muscles: When skeletal muscles contract, they squeeze the veins located between them. This compression helps push the blood forward, against gravity, towards the heart. This mechanism is particularly important in the lower extremities, where the force of gravity can hinder blood flow back to the heart.

2. One-way valves: Veins contain one-way valves that prevent the backward flow of blood. These valves open when blood flows towards the heart and close to prevent blood from flowing backward. The valves ensure that blood moves in one direction, towards the heart, and prevents it from pooling or flowing backward.

3. Pressure changes during breathing: Breathing also plays a role in venous circulation. When we inhale, the diaphragm moves downward, creating a negative pressure in the chest cavity. This negative pressure helps pull blood towards the heart, facilitating venous return. Additionally, the pressure changes in the chest during breathing can also affect the pressure in the veins, aiding in the movement of blood towards the heart.

It's important to note that the movement of blood through veins is slower compared to the movement of blood through arteries. This is because veins have thinner walls and lower pressure compared to arteries.

Please let me know if you found this information helpful or if you have any further questions!