Each heartbeat can be broken into systole and diastole.

每次心跳都可被收缩和。

Now, the " DUB" sound — and, just to be clear, I am not talking about dubstep sounds — that's the aortic and pulmonary semilunar valves closing at the start of diastole.

现，“DUB”音——澄清一下，我不是说 dubStep 音——是主动脉和肺半月瓣期开始时关闭。

The aorta dilates over time, which is a risk for aortic valve insufficiency, where blood leaks back into the left ventricle during diastole.

主动脉逐渐扩，这是主动脉瓣关闭不全的危险因素之一；这种情况下，期时血将反流至左心室。

So restrictive cardiomyopathy causes heart failure, and since filling happens during diastole, we say this is a type of diastolic heart failure.

因此限制型心肌病会导致心力衰竭，且于血液进入心室发生期，所以我们说它是一种期心力衰竭。

Cotton was the heartbeat of the section, the planting and the picking were the diastole and systole of the red earth.

棉花便是本地区的脉搏，植棉和摘棉便是这红土心脏的和收缩。

S1, caused by the atrioventricular valves closing, at the beginning of systole, and S2, caused by the aortic and pulmonary valves closing, at the beginning of diastole.

S1是于房室瓣的关闭导致的，发生收缩早期；S2是于主动脉瓣和肺动脉瓣的关闭导致的，发生早期。

This can happen in two ways, either the heart's ventricles can't pump blood hard enough during systole, called systolic heart failure, or not enough blood fills the ventricles during diastole, called diastolic heart failure.

这可能以两种方式发生：一种是心室心脏收缩期不能足够有力地泵出血液，即收缩性心力衰竭；另一种是心脏期心室充盈不足，即性心力衰竭。

This part of the heartbeat, when blood is filling the relaxed ventricles is called diastole.

血液充满的心室的这个时期被称期。

Usually, this situation is asymptomatic, and patients can have what's known as a continuous murmur, also known as Gibson's murmur, from blood moving from the aorta to the pulmonary artery, continuous because it's heard during systole and diastole.

通常，这种情况是无症状的，而患者可能会有连续性杂音，也称吉布逊杂音，血液从主动脉流入肺动脉；连续是因整个收缩期和期都能听到。

Right after the S2 sound, the tricuspid and mitral valves open back up allowing blood to fill up the ventricles again and this period of time is called diastole.

S2之后，三尖瓣和二尖瓣打开；让血液再次充盈心室，这段时期叫做心脏期。

This is when the aortic valve does not closse properly, resulting in blood flowing back to the left ventricle during diastole- the filling phase.

这是当主动脉瓣关闭不全时，血液期——充盈时相反流至左心室产生的。

When the heart is in this state of relaxation, or diastole, the pressure within the heart is low.

当心脏处于这种放松或状态时，心脏内的压力会很低。

There are two phases of the heartbeat: diastole (relaxation) and systole (contraction).

这种-收缩心动周期（充盈，然后收缩射血）持续约0。9秒，每钟心脏博动70－80次。

Blood pressure is defined as the pressure exerted by the blood against the walls of the blood vessels, and it's at its lowest point during diastole and reaches a peak at systole.

血压定义血液对血管壁施加的压力，期处于最低点，收缩期达到峰值。

This pressure varies over the course of the cardiac cycle, increasing when blood is ejected from the heart(during systole), and decreasing as the heart relaxes(during diastole).

因血管内压力变化与心脏状况、动脉以及其它因素有关，测量血压并对其认真读能指导护理和帮助评估一个人的健康状况。

The interval between S2 and the next S1 is when the ventricles relax and are filled with blood, called diastole.

S2和下一个S1的时间间隔是心室充盈的时候，称期。

So, when you are resting on the couch watching a movie, you could say that most of the time your heart is passively filling with blood and in diastole.

所以，当你躺沙发上看电影的时候，你可以说大多数时候你的心脏是被动地充满血液和的。

Near the end of diastole, the ventricles nearly fill with blood, and then the atria contract, adding even more volume to the ventricles.

末期，心室几乎充满血液，然后心房收缩，心室容积增加。

What we see as a result is that the ventricles rapidly fill during diastole, and pressure within the ventricles begins to rise, along with the volume.

因此，期，心室迅速充盈，并且心室内的压力开始随容积增加。

The volume of blood in the ventricles at the end of diastole is referred to as the end-diastolic volume.

末期心室中的血液量称末期血容量。