What are the three lefts on the body?

Left lung, left atrium, left ventricle.

1. The left side of the human body usually includes the left side of the lungs and heart inside the chest cavity, as well as part of the esophagus and most of the stomach.

2. There is usually a spleen and colon splenic flexure below the stomach, as well as the left descending colon and sigmoid colon.

3. There is a left kidney and ureter behind the peritoneum of the left abdomen, and if it is a woman, there will be a left ovary, fallopian tube and other organs in the left lower abdomen.

4. A very small number of people are mirror people, the organs of the left side of the body are reversed with the right side, the left chest does not have a heart, and the left abdomen does not have a spleen, but there will be liver, gallbladder and other organs and organs.

The lungs are the respiratory organs of the human body, located in the chest cavity, one on the left and one on the left, covering the heart. The lungs are lobulated, two on the left and three on the right, with a total of five lobes. The lungs are connected to the larynx and nose through the lung system (referring to the trachea, bronchi, etc.), so the larynx is called the gateway of the lungs, and the nose is the outer orifice of the lungs.

The direction of blood circulation in the heart.

Superior and inferior vena cava and coronary venous sinuses, right atrium, right atrioventricular orifice (tricuspid valve opening), right ventricular pulmonary ostium (pulmonary valve opening), pulmonary artery lung (gas exchange through capillaries around the alveolar wall), pulmonary vein, left atrium, left atrioventricular orifice (mitral valve opening), left ventricular aortic orifice (aortic valve opening), aorta (distribution throughout the body through arteries at all levels).

Cardiac conduction system.

The sinus node, the atrioventricular junction, the bundle of His, the left and right bundle branches, and the Purkinje cells, as well as the internodal bundle and the atrial bundle are a special class of cardiomyocytes that integrate and connect the junctions and bundles, and their main function is to form and conduct impulses.

Heart shape. One point, one bottom, two sides, three edges, three grooves.

Heart location. Between the 2nd-6th costal cartilage or the 5th-8th thoracic vertebrae.

The entire heart 2 3 is biased to the left side of the body's midline.

The human body is divided into left and right sides, and the left and right sides are basically symmetrical, but the organs are not exactly the same. The organs on the left side of the human body are: the head has the left hemisphere of the brain.

The thyroid gland is in the middle of the neck, and the main artery on the left side is the common carotid artery, internal jugular vein, and vagus nerve. On the left side of the chest there is the left mammary gland, the left lung, and most of the heart. The left and right sides of the abdomen are asymmetrical, and the organs are not the same, the left side mainly has part of the stomach, spleen, part of the small intestine, descending colon, sigmoid colon, left kidney, left adrenal gland, left ureter, and women have left adnexa.

The explanation of the three lefts refers to the Taishi-type Xinqiao, Taizhu, and Taibu in the Six Qings of the Zhou Dynasty. Because it is often in the left of the king, it is called Tan lead. Guo Moruo, "Manuscripts of Chinese History", Part II, Chapter 3, Section 3:

Liuqing is often on the left and right of the king, so it is referred to as 'three left and three right' in the bronze inscriptions. The three left are Taishi, Taizhu, and Taibu, and the three right are Dazai, Taizong, and Taishi. ”

Word decomposition Explanation of 三 ā several names, two plus one (often capitalized "three" on banknotes and documents): three-dimensional space. Trilogy.

Three Kingdoms (Chinese dynasty name). Means multiple times or majority: Think twice.

Clam up. radical : a; Explanation of left left ǒ is the side of the east when facing south, as opposed to "right" :

Left hand. Left. Around.

Capable assistant. Geographically refers to the east: mountain left.

Jiang Zuo. Refers to political ideological ideas and actions that are progressive or exceed what the conditions of reality allow: the left.

Left flank. Left. Oblique, biased, erroneous:

Bu Mengzuo's temper . Left throat.