The entirety of a human being is contained in their body. It is made up of numerous cell types that combine to form tissues, organs, and finally organ systems. They guarantee the survival of the human body and equilibrium.
It is made up of the following: the head, hair, neck, torso (which includes the abdomen and thorax), hands and arms, legs, and feet.
The study of anatomy, physiology, histology, and embryology encompasses the human body. There are recognized anatomical variations in the body. Physiology is the study of the human body's systems and organs, as well as how they work. To keep the blood's levels of sugar and oxygen at safe levels, or homeostasis, a variety of systems and mechanisms work together.
Health professionals, physiologists, and anatomists study the body.
Cellular
Also see: Enumeration of unique cell types found in the adult human body
Trillions of cells, the building blocks of life, are found throughout the body.[3] The body has between 30[4] and 37[5][6] trillion cells at maturity; this estimate is derived from adding all the cell counts and kinds of all the body's organs. About the same amount of multicellular creatures live in the gastrointestinal tract and on the skin as well as non-human cells [4].[7] The body is composed of different materials than cells. Extracellular fluids envelop cells in an extracellular matrix made of proteins like collagen. The average human body weighs 70 kg (150 lb), of which approximately 25 kg (55
DNA
Article principal: Genome
Also see: Genetics
DNA is the basis for all bodily cell function. DNA is located in a cell's nucleus. Here, RNA copies specific DNA sequences and delivers them to the cell's body.[8] After that, the RNA is utilized to make proteins, which are the building blocks of cells, their functions, and the things they produce. The number of proteins produced by a cell allows it to self-regulate. Proteins determine gene expression and cell function.[9] But not all cells contain DNA; some, like fully developed red blood cells, mature by losing their nucleus.
Tissues: Described as cells with specialized actions, tissues are found throughout the body in a wide variety of forms.[10] Histology is the study of tissues, and a microscope is frequently used. There are four primary tissue types in the body. These include muscle, connective tissue, nerve tissue, and epithelium, which are lining cells.[11]
Organs
See also: Human body's list of organs
Except for the skin, organs are organized collections of cells that serve a particular purpose within the body [12]. The liver, lungs, and heart are a few examples. Numerous organs are housed in cavities in the body. The pleura, which houses the lungs, and the abdomen, which houses the stomach, are two examples of these cavities.
Gallbladder
Article main: Gallbladder
The inferior middle section of the right hepatic lobe is posterior to the hollow, pear-shaped gallbladder. Its size and form are erratic. It helps with fat digestion by storing bile before releasing it into the small intestine through the common bile duct. The cystic duct, which joins the common hepatic duct to form the common bile duct, transports bile from the liver to it.[22]
The cystic artery, which typically arises from the right hepatic artery, supplies blood to the gallbladder.[22]
A common condition known as gallstones causes one or more stones to form in the biliary tract or gallbladder. Most people don't have any symptoms, however if a stone
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