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This is an accepted version of this page This is the latest accepted revision, reviewed on 11 December 2024. List of organ systems in the human body Part of a series of lists about Human anatomy General Features Regions Variations Movements Systems Structures Arteries Bones Eponymous Foramina Glands endocrine exocrine Lymphatic vessels Nerves Organs Systems Veins Muscles Abductors Adductors ...
Explanation of the levels in the human body; defines the column labels in the next table. Level Definition Organ systems: A biological system consisting of a group of organs that work together to perform one or more functions. Organ sub-systems A biological system consisting of a group of organs that work together to perform just one function.
There are other systems in the body that are not organ systems—for example, the immune system protects the organism from infection, but it is not an organ system since it is not composed of organs. Some organs are in more than one system—for example, the nose is in the respiratory system and also serves as a sensory organ in the nervous ...
At the same time, a second meaning arose, in reference to a "body part adapted to a certain function". [15] Plant organs are made from tissue composed of different types of tissue. The three tissue types are ground, vascular, and dermal. [16] When three or more organs are present, it is called an organ system. [17]
A somatosensory pathway will typically have three neurons: [18] first-order, second-order, and third-order. [ 19 ] The first-order neuron is a type of pseudounipolar neuron and always has its cell body in the dorsal root ganglion of the spinal nerve with a peripheral axon innervating touch mechanoreceptors and a central axon synapsing on the ...
The human body consists of many interacting systems of organs. These interact to maintain homeostasis, keeping the body in a stable state with safe levels of substances such as sugar and oxygen in the blood. [58] Each system contributes to homeostasis, of itself, other systems, and the entire body. Some combined systems are referred to by joint ...
Some other examples include lung diseases such as pneumonia, metabolic disorders such as hypocalcemia, kidney diseases like renal cell carcinoma, and hiccups can also be a symptom of tumors in the ...
There are several different secondary messenger systems (cAMP system, phosphoinositol system, and arachidonic acid system), but they all are quite similar in overall mechanism, although the substances involved and overall effects can vary. In most cases, a ligand binds to a cell surface receptor. The binding of a ligand to the receptor causes a ...