Chapter Four, pediatric advanced life support. Welcome to the lesson on Normal Heart anatomy for pls. In this video, we'll discuss the normal cardiac anatomy, which will help understand physiology in the next video. The heart is a muscle comprised of four chambers that are all surrounded by thick balls of tissue called septum. The two upper chambers are the atria and the two lower chambers are the ventricles. The right and left halves of the heart work together to pump blood throughout the body.
The right atrium receives blood from the body and sends it to the right ventricle to be sent to the lungs for oxygenation. The left atrium received the newly oxygenated blood and sends it to the left ventricle to be sent throughout the rest of the body. balance between each chamber prevent reverse blood flow. Blood leaves the heart through a large vessel called the aorta. The two atria contract simultaneously as to the ventricles, making the contractions of the heart go from the top to the bottom. Each beat begins in the right atrium.
The left ventricle is the largest and has the thickest wall. As it is responsible for pumping the newly oxygenated blood to the rest of the body. The electrical pathways of the heart begin in the sign of atrial or SA node and the right atrium. Together, they create the electrical activity that acts as the heart's natural pacemaker. This electrical impulse then travels to the atrial ventricular or AV node, which lies between the atria and the ventricles. After pausing briefly, the electrical impulse moves to the his purkinje system, which acts as wiring to conduct the electrical signal into the left and right ventricles.
This electrical signal causes the heart muscle to contract and pump blood. This concludes the normal heart anatomy for pa LS Next, we'll review the normal heart physiology for pa LS