Question

Какое влияние оказывает «мышечный насос» на работу сердца?

Answer 1

Ответ:

+После прохождения через капилляры кровь попадает в вены и по ним возвращается к сердцу. Движение крови по венам затруднено, во-первых, по причине их удаленности от сердца и падения в них кровяного давления, во-вторых, в большинстве случаев кровь движется по венам вверх против силы тяжести.

Answer 2

The Influence of the "Muscle Pump" on the Function of the Heart

The "muscle pump" refers to the mechanism by which skeletal muscles contract and relax, aiding in the circulation of blood throughout the body. This mechanism plays a significant role in the function of the heart. Let's explore the influence of the muscle pump on the work of the heart in more detail.

1. Increased Venous Return: When skeletal muscles contract during physical activity, they compress the veins running through them. This compression helps to push blood towards the heart, increasing venous return. Venous return refers to the volume of blood returning to the heart from the body's veins. By increasing venous return, the muscle pump enhances the filling of the heart's chambers, leading to an increased preload, or the amount of blood available for the heart to pump out with each contraction.

2. Enhanced Cardiac Output: The increased preload resulting from the muscle pump's effect on venous return leads to an increase in cardiac output. Cardiac output is the volume of blood pumped by the heart per minute and is calculated by multiplying the heart rate (number of heartbeats per minute) by the stroke volume (the amount of blood pumped out of the heart with each contraction). With an increased preload, the heart is able to pump out a larger volume of blood, resulting in an increased cardiac output.

3. Improved Oxygen Delivery: The muscle pump also aids in the delivery of oxygen to the working muscles. As blood is pushed towards the heart by the muscle pump, it passes through the lungs, where oxygen is replenished and carbon dioxide is removed. This oxygenated blood is then pumped back to the muscles, providing them with the necessary oxygen for energy production. Therefore, the muscle pump indirectly contributes to the overall oxygen delivery to the body's tissues.

It is important to note that while the muscle pump has a positive influence on the function of the heart, other factors such as heart rate, blood pressure, and overall cardiovascular health also play significant roles in maintaining optimal cardiac function.