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Mediastinum
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- The heart is located underneath the sternum in a thoracic compartment called the mediastinum, which occupies the space between the lungs.
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Sep 14, 2021 · The human heart is located within the thoracic cavity, medially between the lungs in the space known as the mediastinum. Figure \(\PageIndex{1}\) shows the position of the heart within the thoracic cavity.
- 17.2: Location, Size, and Shape of the Heart - Biology LibreTexts
The heart is located within the thoracic cavity. Between the...
- 17.2: Location, Size, and Shape of the Heart - Biology LibreTexts
- Overview
- How does the heart work?
- Heart anatomy
- How do you know if the heart is healthy?
- Symptoms of a heart attack
- Other heart conditions
- When to see a doctor
- Summary
The heart is a complex organ that pumps blood throughout the body. It sits in the chest, slightly left of center, behind the breastbone, and between the lungs.
A heart that is not healthy does not always produce symptoms. However, certain signs and symptoms can indicate a problem with the heart.
The heart is responsible for pumping blood throughout the body. To do this, the heart fills with blood and then contracts to push the blood through the circulatory system. Electrical impulses tell the heart how often to contract or “beat.”
The right side of the heart receives blood from the veins and pumps it on toward the lungs. Here, the blood receives oxygen and removes carbon dioxide for the lungs to breathe out. The left side of the heart then receives the oxygenated blood from the lungs and pumps it through arteries to the rest of the body.
The interactive BodyMap diagram below shows the location of the heart in the chest. Press the buttons to interact, including adding and removing layers and moving around the diagram.
The heart has four distinct chambers. The left and right atria are at the top, and the left and right ventricles are at the bottom. The septum is a tissue wall separating the left and right chambers.
The heart also has four valves:
•The pulmonic valve opens and closes to regulate blood flow from the right ventricle to the pulmonary artery (lungs).
•The aortic valve opens and closes to regulate oxygenated blood from the left ventricle to the aorta (the largest artery in the body).
•The mitral valve opens and closes to regulate oxygenated blood flow from the left atrium to the left ventricle.
Signs of arrhythmia
Heart arrhythmia is the medical term for a heartbeat that is too fast, too slow, or irregular. Arrhythmias occur when the electrical impulses that control the heartbeat malfunction. This can give rise to a fluttering sensation in the chest, which doctors refer to as palpitations. A persistent arrhythmia can affect heart function, leading to more severe symptoms, such as: •pounding sensations in the chest •weakness or fatigue •dizziness or lightheadedness •fainting •shortness of breath •anxiety •pain or pressure in the chest •sudden cardiac arrest •swelling in the feet, legs, hands or other areas of the body Palpitations are not always a sign of an underlying heart condition. They can occur as a result of anxiety or the use of caffeine and other stimulants. However, a person should see a doctor if they experience frequent arrhythmias, or they experience other signs and symptoms of a heart problem.
Signs of heart failure
Heart failure is where the heart is no longer effective at pumping blood around the body. According to the American Heart Association (AHA), some common signs of heart failure include: •an unexplained increase in heart rate •tiredness or fatigue •confusion or inability to think clearly •nausea •loss of appetite •swelling in the feet, legs, hands or other areas of the body with unexplained weight gain •shortness of breath •sleeping on extra pillows •waking up at night short of breath •a persistent cough that may produce pink-tinged mucus
A heart attack is a medical emergency in which the blood supply to the heart becomes blocked. Without sufficient blood supply, the heart muscles become damaged and begin to die.
According to the Centers for Disease Control and Prevention (CDC), the five most common signs of a heart attack include:
•chest pain or discomfort
•pain or discomfort in one or both shoulders or arms
•discomfort or pain in the jaw, back or neck
•shortness of breath
Heart disease is an umbrella term that can refer to several different heart conditions. The most common is coronary artery disease (CAD). In CAD, the major arteries that supply the heart become blocked or damaged, thereby increasing the risk of a heart attack.
Other conditions related to heart disease include:
•Angina: Pain in the chest due to lack of blood to the heart.
•Aortic aneurysm and dissection: A condition in which the aorta becomes enlarged or torn.
•Arrhythmias: A heartbeat that is irregular or abnormally fast or slow.
•Atherosclerosis: A buildup of fatty deposits, or plaque, in the arteries.
A person should talk to their doctor if they experience signs or symptoms of the following conditions:
•heart arrhythmia
•heart disease
•any underlying medical condition that could affect the heart
The heart is a complex organ with several chambers, valves, and tissues that work together to pump blood around the body. Electrical impulses regulate the timing of each heartbeat.
Sometimes, heart disease is silent, meaning a person may not develop any symptoms until they experience a cardiac event, such as arrhythmia or heart attack. People must see a doctor if they experience any concerns relating to their heart.
Jan 20, 2018 · The chest is the area of origin for many of the body’s systems as it houses organs such as the heart, esophagus, trachea, lungs, and thoracic diaphragm. The circulatory system does most of its...
- Location of the Heart. The human heart is located within the thoracic cavity, medially between the lungs in the space known as the mediastinum. Figure 19.2 shows the position of the heart within the thoracic cavity.
- Shape and Size of the Heart. The shape of the heart is similar to a pinecone, rather broad at the superior surface and tapering to the apex (see Figure 19.2).
- Chambers and Circulation through the Heart. The human heart consists of four chambers: The left side and the right side each have one atrium and one ventricle.
- Membranes, Surface Features, and Layers. Our exploration of more in-depth heart structures begins by examining the membrane that surrounds the heart, the prominent surface features of the heart, and the layers that form the wall of the heart.
The heart is located in the thoracic cavity medial to the lungs and posterior to the sternum. On its superior end, the base of the heart is attached to the aorta, pulmonary arteries and veins, and the vena cava. The inferior tip of the heart, known as the apex, rests just superior to the diaphragm.
The heart is located within the thoracic cavity. Between the two lungs and their cavities (pleural cavities) is a central cavity called the mediastinum. The heart is located inside of the mediastinum in an inner cavity called the pericardial cavity.
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Oct 20, 2024 · The human heart is located within the thoracic cavity, medially between the lungs in the region known as the mediastinum. The mediastinum also includes the portions of the major blood vessels, the trachea, and the esophagus that are positioned between the lungs medially.
