The Heart and Its Chambers
The heart is the organ that pumps blood to different parts of the body. The human heart is a
four-chambered heart located at the center of the chest and as big as one's clenched fist. The
chambers of the heart consist of two atria and two ventricles. The heart chambers are
partitioned by a muscular wall called the septum.
The atria are the receiving chambers of the heart. The right atrium receives oxygen-poor blood
coming from all parts of the body, while the left atrium receives oxygen-rich blood coming from
the lungs.
The ventricles are the pumping chambers of the heart. The right ventricle pumps blood to the
lungs for oxygenation, while the left ventricle pumps oxygen-rich blood to all parts of the body.
Blood Vessels and Valves Found in the Heart
, Blood vessels are connected to the heart. The vena cava, which is the largest vein, sends ox!
poor blood back to the heart. It has two branches: the superior vena cava, which drains blood
fron head and neck region to the right atrium, and the inferior vena cava, which drains blood
from the lo parts of the body to the right atrium. The pulmonary artery sends blood from the right
ventricle to lungs for oxygenation. The pulmonary veins send oxygen-rich blood from the lungs
to the left atrium. aorta, which is the largest artery, sends oxygen-rich blood from the left atrium
to all parts of the bo The branches of the aorta, called the coronary arteries, supply blood to the
heart.
As blood moves from one place to another within the heart, there should be no backflowing of
the blood. This backflowing phenomenon is painful and life-threatening. Flaps of tough muscles,
called valves, prevent this from happening. Between the atria and the ventricles are the
atrioventricular (AV) or cuspid valves-the tricuspid valves between the right atrium and right
ventricle and the bicuspid or mitral valves between the left atrium and left ventricle. Within the
openings of the vena cava and the aorta are the semilunar (SL) valves—the pulmonic valves
within the opening of the pulmonary artery and the aortic valves within the opening of the aorta.
As these valves close, blood moving toward its destination will not flow back from where it
came.
When the atria contract, blood from the atria moves toward the ventricles that are in a relaxed
state. As this happens, the AV valves are open while the SL valves are closed.
When the ventricles contract, blood moves to their destinations—to the lungs and to all parts of
the body. At this moment, the atria are relaxed; the AV valves are closed while the SL valves
are open. Thus, the closing of the valves ensures that blood moves toward its destination and
will not flow back from where it came.
Different types of blood vessels
human circulatory system is described as a closed circulatory system. This is because, as the
blood journeys through the entire body, it remains confined within the network of blood vessels.
There are three kinds of blood vessels: artery, vein, and capillary.
The heart is the organ that pumps blood to different parts of the body. The human heart is a
four-chambered heart located at the center of the chest and as big as one's clenched fist. The
chambers of the heart consist of two atria and two ventricles. The heart chambers are
partitioned by a muscular wall called the septum.
The atria are the receiving chambers of the heart. The right atrium receives oxygen-poor blood
coming from all parts of the body, while the left atrium receives oxygen-rich blood coming from
the lungs.
The ventricles are the pumping chambers of the heart. The right ventricle pumps blood to the
lungs for oxygenation, while the left ventricle pumps oxygen-rich blood to all parts of the body.
Blood Vessels and Valves Found in the Heart
, Blood vessels are connected to the heart. The vena cava, which is the largest vein, sends ox!
poor blood back to the heart. It has two branches: the superior vena cava, which drains blood
fron head and neck region to the right atrium, and the inferior vena cava, which drains blood
from the lo parts of the body to the right atrium. The pulmonary artery sends blood from the right
ventricle to lungs for oxygenation. The pulmonary veins send oxygen-rich blood from the lungs
to the left atrium. aorta, which is the largest artery, sends oxygen-rich blood from the left atrium
to all parts of the bo The branches of the aorta, called the coronary arteries, supply blood to the
heart.
As blood moves from one place to another within the heart, there should be no backflowing of
the blood. This backflowing phenomenon is painful and life-threatening. Flaps of tough muscles,
called valves, prevent this from happening. Between the atria and the ventricles are the
atrioventricular (AV) or cuspid valves-the tricuspid valves between the right atrium and right
ventricle and the bicuspid or mitral valves between the left atrium and left ventricle. Within the
openings of the vena cava and the aorta are the semilunar (SL) valves—the pulmonic valves
within the opening of the pulmonary artery and the aortic valves within the opening of the aorta.
As these valves close, blood moving toward its destination will not flow back from where it
came.
When the atria contract, blood from the atria moves toward the ventricles that are in a relaxed
state. As this happens, the AV valves are open while the SL valves are closed.
When the ventricles contract, blood moves to their destinations—to the lungs and to all parts of
the body. At this moment, the atria are relaxed; the AV valves are closed while the SL valves
are open. Thus, the closing of the valves ensures that blood moves toward its destination and
will not flow back from where it came.
Different types of blood vessels
human circulatory system is described as a closed circulatory system. This is because, as the
blood journeys through the entire body, it remains confined within the network of blood vessels.
There are three kinds of blood vessels: artery, vein, and capillary.
