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The sinoatrial node (SA node) is the primary pacemaker of the heart. It is a region of cardiac muscle on the wall of the upper right atrium near to the superior vena cava entrance. The cells that make up the SA node are specialized cardiomyocytes known as pacemaker cells that can spontaneously generate cardiac action potentials.
Respiratory system. Digestive system. Skeletal system. Muscular system. Nervous system. Reproductive system (female) Reproductive system (male) Each organ in your body’s 11 organ systems work so ...
The largest parts of the digestive system include: Esophagus: A hollow tubular organ in the neck and chest area that connects the mouth to the stomach. Muscles here propel food to the stomach ...
They ensure homeostasis and the viability of the human body. It consists of a head, hair, neck, torso (which includes the thorax and abdomen ), arms, hands, legs, and feet . The study of the human body includes anatomy, physiology, histology and embryology. The body varies anatomically in known ways.
TA2. 1102. FMA. 12243. Anatomical terminology. [ edit on Wikidata] The intercostal space ( ICS) is the anatomic space between two ribs (Lat. costa). Since there are 12 ribs on each side, there are 11 intercostal spaces, each numbered for the rib superior to it. [1]
There are two types of coronary blood vessels that supply blood flow to the heart: arteries and veins. They include: The myocardium —the muscles of the heart—are fueled with freshly oxygenated ...
Lateral aspect. In anatomy, the zygomatic arch, or cheek bone, is a part of the skull formed by the zygomatic process of the temporal bone (a bone extending forward from the side of the skull, over the opening of the ear) and the temporal process of the zygomatic bone (the side of the cheekbone), the two being united by an oblique suture (the ...
The muscles of the abdomen protect vital organs underneath and provide structure for the spine. These muscles help the body bend at the waist. The major muscles of the abdomen include the rectus ...
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