Heart
Heart is a muscular organ that pumps blood throughout the body through the circulatory system. It supplies oxygen and nutrients to tissues and removes carbon dioxide and metabolic waste products. The heart is one of the most important organs in humans and many animals. :contentReference[oaicite:0]{index=0}
In humans, the heart is located in the chest between the lungs and is approximately the size of a closed fist. :contentReference[oaicite:1]{index=1}
Overview
The heart functions continuously to maintain blood circulation and support body functions.
The blood circulation process can be represented as:
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The heart works together with blood vessels to form the cardiovascular system. :contentReference[oaicite:3]{index=3}
Structure
The human heart contains four chambers:
- Right atrium
- Right ventricle
- Left atrium
- Left ventricle
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The right side of the heart pumps oxygen-poor blood to the lungs, while the left side pumps oxygen-rich blood to the body. :contentReference[oaicite:5]{index=5}
Heart Valves
The heart contains four major valves that regulate blood flow:
- Tricuspid valve
- Pulmonary valve
- Mitral valve
- Aortic valve
These valves help maintain one-way blood circulation inside the heart. :contentReference[oaicite:6]{index=6}
Functions
Major functions of the heart include:
- Pumping blood
- Delivering oxygen
- Removing carbon dioxide
- Maintaining blood pressure
- Supporting circulation
The heart beats continuously throughout life to maintain circulation. :contentReference[oaicite:7]{index=7}
Blood Flow
Blood moves through the heart and lungs in a coordinated cycle.
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Deoxygenated blood enters the right side of the heart, travels to the lungs for oxygenation, and returns to the left side before being pumped to the body. :contentReference[oaicite:9]{index=9}
Heartbeat
The heart beats through electrical signals generated by specialized cardiac cells.
The normal resting heart rate in adults is usually between 60 and 100 beats per minute. :contentReference[oaicite:10]{index=10}
Common Heart Diseases
Several diseases affect the heart, including:
- Coronary artery disease
- Heart failure
- Arrhythmia
- Heart attack
- Hypertension
- Cardiomyopathy
Heart diseases are major causes of illness and death worldwide. :contentReference[oaicite:11]{index=11}
Diagnosis
Doctors use several methods to examine heart health:
- Electrocardiogram (ECG)
- Echocardiography
- CT scan
- MRI
- Stress test
- Blood pressure measurement
These tests help identify heart abnormalities and cardiovascular diseases. :contentReference[oaicite:12]{index=12}
Importance
The heart is essential for survival because it maintains circulation and oxygen delivery throughout the body. Proper heart function supports all major organs and biological systems. :contentReference[oaicite:13]{index=13}