Text A. Work of the Human HeartThe

Text A. Work of the Human HeartThe human heart contracts from the first moment of life until the last one. The contractions of the heart pump the blood through the arteries to all the parts of the body. Scientists have determined that the total weight of the blood pumped by the heart daily is about ten tons.The rate of heart contractions is regulated by two groups of nerve fibers. It varies in different persons and at different age.Physiologists have determined that in the adult the heart makes from 60 to 72 beats per minute. In children the rate of heartbeat is much higher. Research work of many scientists has helped to determine that the rate of heartbeat increases depending on different emotions.Each beat of the heart is followed by a period of rest for the cardiac muscle. Each wave of contraction and a period of rest following it compose a cardiac cycle.Research work has given physiologists the possibility to find out that the heart muscle works or contracts about one third of the time of the person’s life. The period of rest is shorter during greater physical exertion and longer when the body is at rest.Each cardiac cycle consists of three phases: physiologists have called the first phase of short contraction of both atria—the atrial systole. They have called the second phase of a more prolonged contraction of both ventricles—the ventricular systole. The period of rest of the cardiac muscle is called the diastole.The left ventricle discharges out the blood received by the left atrium from the pulmonary circulation through the aorta to the systemic circulation.The blood received from the systemic circulation by the right atrium is discharged out of the right ventricle to the lungs through the pulmonary arteries.Prolonged research work of many physiologists has given the possibility to estimate the role of the ventricles which serve as the main pump. The atria act as receiving chambers. The contraction of the atria which sends the final portion of the blood into the ventricle is considerably less.

Результаты (английский) 1:

Text A. Work of the Human Heart
The human heart contracts from the first moment of life until the last one. The contractions of the heart pump the blood through the arteries to all the parts of the body. Scientists have determined that the total weight of the blood pumped by the heart daily is about ten tons.
The rate of heart contractions is regulated by two groups of nerve fibers. It varies in different persons and at different age.
Physiologists have determined that in the adult the heart makes from 60 to 72 beats per minute. In children the rate of heartbeat is much higher. Research work of many scientists has helped to determine that the rate of heartbeat increases depending on different emotions.
Each beat of the heart is followed by a period of rest for the cardiac muscle. Each wave of contraction and a period of rest following it compose a cardiac cycle.
Research work has given physiologists the possibility to find out that the heart muscle works or contracts about one third of the time of the person’s life. The period of rest is shorter during greater physical exertion and longer when the body is at rest.
Each cardiac cycle consists of three phases: physiologists have called the first phase of short contraction of both atria—the atrial systole. They have called the second phase of a more prolonged contraction of both ventricles—the ventricular systole. The period of rest of the cardiac muscle is called the diastole.
The left ventricle discharges out the blood received by the left atrium from the pulmonary circulation through the aorta to the systemic circulation.
The blood received from the systemic circulation by the right atrium is discharged out of the right ventricle to the lungs through the pulmonary arteries.
Prolonged research work of many physiologists has given the possibility to estimate the role of the ventricles which serve as the main pump. The atria act as receiving chambers. The contraction of the atria which sends the final portion of the blood into the ventricle is considerably less.

Результаты (английский) 3:

文本A.人类心脏的工作
人的心脏从生命的第一刻到最后一刻都在收缩。心脏的收缩将血液通过动脉泵送到身体的各个部位。科学家已经确定，心脏每天泵出的血液总重量约为10吨。
心脏收缩率由两组神经纤维调节。它因不同的人和不同的年龄而不同。
生理学家已经确定，成年人的心脏每分钟跳动60到72次。儿童的心跳频率要高得多。许多科学家的研究工作有助于确定心跳的速度取决于不同的情绪。
心脏的每一次跳动之后都有一段时间的心肌休息。每波收缩和随后的一段休息构成一个心动周期。
研究工作使生理学家有可能发现，心脏肌肉工作或收缩的时间约为人一生的三分之一。在更大的体力活动中，休息时间更短，而在身体休息时，休息时间更长。
每个心动周期由三个阶段组成：生理学家称两个心房的第一个短收缩阶段为心房收缩。他们把两个心室收缩时间延长的第二阶段称为心室收缩。心肌的休息期称为舒张期。
左心室将左心房接收到的血液从肺循环经主动脉排出到全身循环。
右心房从全身循环中获得的血液通过肺动脉从右心室排出到肺。
许多生理学家长期的研究工作使我们有可能估计作为主要泵的心室的作用。中庭充当接待室。心房的收缩将血液的最后一部分送入心室的程度要小得多。