An anatomical overview of the human heart in biology

heart anatomy and physiology

Heart nodes and nerve fibers play an important role in causing the heart to contract. During heart beat, pericardial fluid prevent heart from shock and mechanical injury Myocardium Myocardium is the middle layer which is composed of specialized cardiac muscle only found in heat Myocardium is striated muscle but not under voluntary movement.

Pulmonary valve: prevents the backflow of blood as it is pumped from the right ventricle to the pulmonary artery.

anatomical structure of the heart

CPR courses are offered at a variety of locations, including colleges, hospitals, the American Red Cross, and some commercial companies. The inferior tip of the heart, the apex, lies just to the left of the sternum between the junction of the fourth and fifth ribs near their articulation with the costal cartilages.

Human heart anatomy

The inferior tip of the heart, the apex, lies just to the left of the sternum between the junction of the fourth and fifth ribs near their articulation with the costal cartilages. The pulmonary trunk arteries and their branches are the only arteries in the post-natal body that carry relatively deoxygenated blood. Highly oxygenated blood returning from the pulmonary capillaries in the lungs passes through a series of vessels that join together to form the pulmonary veins—the only post-natal veins in the body that carry highly oxygenated blood. The heart pumps about 6 quarts 5. Cardiac Cycle : This article discusses the two phases of the cardiac cycle, diastole and systole, and explains what happens at every step. A heart attack can lead to cardiac arrest, but the latter can also be caused by other problems, he said. These vessels in turn branch many times before reaching the pulmonary capillaries, where gas exchange occurs: Carbon dioxide exits the blood and oxygen enters. Endocardium: the inner layer of the heart. If the heart should stop, CPR can maintain the flow of blood until the heart resumes beating. Most people are familiar with the sound of a human heartbeat. The two chambers at the top of the heart are known as the atria, a right and a left. From here, blood enters the left ventricle, which pumps it into the systemic circuit. Left side Newly oxygenated blood returns to the left atrium via the pulmonary vein.

Two technical terms are used in connection with heart, e. The heart is a muscular organ roughly the size of a closed fist. Vessels that carry blood away from the heart to the body are called arteries, while those that bring it back are called veins.

human heart location

These vessels in turn branch many times before reaching the pulmonary capillaries, where gas exchange occurs: Carbon dioxide exits the blood and oxygen enters.

The right ventricle does not need to generate as much pressure, since the pulmonary circuit is shorter and provides less resistance.

What is heart

During diastole, the ventricles relax and receive blood from the atria. Eventually, these vessels will lead to the systemic capillaries, where exchange with the tissue fluid and cells of the body occurs. They normally include practice of the compression technique on a mannequin. Veins Brachiocephalic veins: two large veins that join to form the superior vena cava. A double-walled sac called the pericardium encases the heart, which serves to protect the heart and anchor it inside the chest. Semilunar valve Right ventricle pumps blood through pulmonary aorta to lungs and left ventricle pumps blood through aorta. Ventricles : lower two chambers of the heart. Endocardium — lines the inside of the heart and protects the valves and chambers. Thicker nodules or corpora Arantii are attached at the centre of free margin of each semilunar pocket. The ventricles serve as the primary pumping chambers of the heart, propelling blood to the lungs or to the rest of the body. It arises from the left ventricle. From the right ventricle, which is less muscular than the left, arises the pulmonary trunk, carrying reduced blood to the lungs. The two semilunar valves are the pulmonary and the aortic.
Rated 9/10 based on 63 review
Download
Anatomy of the Human Heart