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Electrical “wiring system”
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- An electrical “wiring system” is responsible for causing the heart to beat. Each heartbeat is triggered by an impulse that starts in the sinus node, which is a group of cells in the wall of the right atrium. Special pathways of nerves carry the electrical impulses to the muscle cells in the atria and ventricles, setting the pace of the heartbeat.
www.ncbi.nlm.nih.gov/books/NBK279249/
Jan 26, 2024 · The superior vena cava carries blood from your upper body. The inferior vena cava brings blood from your lower body. Then the right atrium pumps the blood to your right ventricle. Right ventricle: The lower right chamber pumps the oxygen-poor blood to your lungs through the pulmonary artery.
Jun 6, 2023 · The heart provides the body’s organs and tissues with a constant supply of blood – and with it vital oxygen and nutrients. You can think of the heart as a central pump that keeps the blood circulating around the body. At rest, an adult heart beats about 60 to 80 times a minute.
- 2023/06/06
Mar 24, 2022 · The valves open and shut in time with the pumping action of your heart's chambers. The opening and closing involve a set of flaps called cusps or leaflets. The cusps open to allow blood to flow out of a chamber and close to allow the chamber to refill with blood.
It is responsible for the heart’s “pumping” action. Endocardium – The innermost layer that lines the inner heart chambers and covers the heart valves. Prevents blood from sticking, thereby avoiding the formation of fatal blood clots.
- 77 min
- Pulmonary circulation is a type of blood circulation responsible for carrying deoxygenated blood away from the heart, and to the lungs, where it is...
- In systemic circulation, the heart pumps the oxygenated blood through the arteries to every organ and tissue in the body, and then back again to th...
- The heart is a muscle, and it needs a constant supply of oxygenated blood to survive and work effectively. This is where coronary circulation fulfi...
- The human heart is divided into four chambers, namely two ventricles and two atria. The ventricles are the chambers that pump blood and atrium are...
- Left atrium Right atrium Left ventricle Right ventricle
- The pericardium is a fibrous membrane that envelops the heart. It also serves a protective function by producing a serous fluid, which lubricates t...
- The blood vessels comprise: Veins – It supplies deoxygenated blood to the heart via inferior and superior vena cava, eventually draining into the...
- Valves are flaps of tissues that are present in cardiac chambers between the veins. They prevent the backflow of blood. Examples include the atriov...
The heart's pumping action is regulated by an electrical conduction system that coordinates the contraction of the various chambers of the heart. How does the heart beat? An electrical stimulus is generated by the sinus node (also called the sinoatrial node, or SA node).
Oct 31, 2024 · The pumping of the heart, or the heartbeat, is caused by alternating contractions and relaxations of the myocardium. These contractions are stimulated by electrical impulses from a natural pacemaker, the sinoatrial , or S-A, node located in the muscle of the right atrium .
The heart's pumping action is controlled by an electrical conduction system that coordinates the contraction of the heart chambers. How does the heart beat? An electrical stimulus is generated in a special part of the heart muscle called the sinus node. It's also called the sinoatrial node (SA node).
