How does blood flow through the human heart?

Answer 1

All blood enters the right side of the heart through two veins: The superior vena cava(SVC) and the inferior vena cava (IVC) (see figure 3).

The SVC collects blood from the upper half of the body. The IVC collects blood from the lower half of the body. Blood leaves the SVC and the IVC and enters the right atrium (RA) (3).

When the RA contracts, the blood goes through the tricuspid valve (4) and into the right ventricle (RV) (5). When the RV contracts, blood is pumped through the pulmonary valve (6), into the pulmonary artery (PA) (7) and into the lungs where it picks up oxygen.

Figure 3

Heartbeat, It's a Love Beat

The average heartbeat is 72 times per minute. In the course of one day it beats over 100,000 times. In one year the heart beats almost 38 million times, and by the time you are 70 years old, on average, it's made it to 2.5 billion beats.

Why does it happen this way? Because blood returning from the body is relatively poor in oxygen. It needs to be full of oxygen before being returned to the body. So the right side of the heart pumps blood to the lungs first to pick up oxygen before going to the left side of the heart where it is returned to the body full of oxygen.

Blood now returns to the heart from the lungs by way of the pulmonary veins (8) and goes into the left atrium(LA) (9). When the LA contracts, blood travels through the mitral valve (10) and into the left ventricle (LV) (11). The LV is a very important chamber that pumps blood through the aortic valve (12) and into the aorta (13). The aorta is the main artery of the body. It receives all the blood that the heart has pumped out and distributes it to the rest of the body. The LV has a thicker muscle than any other heart chamber because it must pump blood to the rest of the body against much higher pressure in the general circulation (blood pressure).

Here is a recap of what we just discussed. Blood from the body flows:

• to the superior and inferior vena cava,
• then to the right atrium
• through the tricuspid valve
• to the right ventricle
• through the pulmonic valve
• to the pulmonary artery
• to the lungs

Read more: How_does_blood_flow_through_your_heart_chambers

Answer 2

Blood that is low in oxygen enters the right atrium through the superior vena cava and inferior vena cava. The blood then passes through the tricuspid valve and into the right ventricle. From here, the blood passes through the pulmanary valve and into the pulmanary trunk and out the pulmanary arteries and into the lungs. Oxygen rich blood from the lungs enters the left atrium through the pulmanary veins. From here, the blood passes through the mitral valve and into the left ventricle. From the left ventricle, the blood passes through the aortic valve and into the aorta, the largest artery in the body. From the aorta, blood can be delivered to the rest of the body.

Answer 3

The blood flows through the tubes inside you to travel to the heart.