The circulatory system>
When it leaves the left atrium, blood passes through the tricuspid valve into the left ventricle.
Pulmonary circuit
Because blood travels directly from the left atrium to the left ventricle.
From the vena cava, blood travels into the right atrium, then the right ventricle. The right ventricle pumps the blood through the pulmonary arteries to the lungs. The pulmonary vein carries the oxygenated blood back to the left atrium. The blood flows from the left atrium into the left ventricle which pumps the blood through the aorta and to the rest of the body.
Let's start with deoxygenated blood at the heart. It enters the right atrium of the heart, then passes into the right ventricle. From here, it is pumped to the lungs where gaseous exchange takes place. After this, it returns to heart, the left atrium this time. It passes into the left ventricle and is pumped to all the other organs in the body. The deoxygenated blood returns to the heart to complete the circuit.
When it leaves the left atrium, blood passes through the tricuspid valve into the left ventricle.
Pulmonary circuit
Because blood travels directly from the left atrium to the left ventricle.
A very simplistic explanation: If we start with the aorta (the biggest artery in the body), the oxygenated blood from the heart travels through this around the entire body and supplies oxygen, nutrients, etc. The deoxygenated blood then travels back to the heart via the venous systems and enters the left atrium. From the left atrium it travels to the left ventricle and is pumped by this ventricle through the pulmonary arteries (don't be deceived by the name here - the blood is still deoxygenated), to the lungs where it picks up oxygen. The oxygenated blood then travels back to the heart through the pulmonary veins and enters the right atrium. It then travels into the right ventricle and the ventricle pumps the blood into the aorta and the cycle repeats. Essentially you have two closed loops.
From the vena cava, blood travels into the right atrium, then the right ventricle. The right ventricle pumps the blood through the pulmonary arteries to the lungs. The pulmonary vein carries the oxygenated blood back to the left atrium. The blood flows from the left atrium into the left ventricle which pumps the blood through the aorta and to the rest of the body.
Let's start with deoxygenated blood at the heart. It enters the right atrium of the heart, then passes into the right ventricle. From here, it is pumped to the lungs where gaseous exchange takes place. After this, it returns to heart, the left atrium this time. It passes into the left ventricle and is pumped to all the other organs in the body. The deoxygenated blood returns to the heart to complete the circuit.
* Vena Cava * Right atrium * tricuspid valve * right ventricle * pulmonary valve * pulmonary artery * pulmonary circuit * pulmonary vein * left atrium * mitral (bicuspid) valve * left ventricle * aortic valve * aorta * systemic circuit
Blood enters the left atrium through the pulmonary veins, and is pumped into the left ventricle through the mitral valve.
Blood circulation involves four heart chambers: It starts at the right atrium and then travels to the right ventricle. After the right ventricle blood travels towards the lungs to become oxygen rich and release Carbon-dioxide. After becoming rich with oxygen, the blood travels back to the heart and enters through the left atrium. It travels next through the right ventricle and then exits the heart through the aorta. This is where it goes it's separate directions to bring oxygenated blood to all of your bodily components.
right ventricle
Left atrium.
It goes through the pulmonary artery, to the lung. Becomes oxygenated, and goes to the left atrium. It is pumped through the Mitral valve, into the Left Ventricle. Left Ventricle pumps it through the aortic valve to the aorta.