Commit: The 11 organ systems and their functions
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| The 11 organ systems and their functions | Life is a characteristic that distinguishes physical entities that have biological processes, such as signaling and self-sustaining processes, from those that do not, either because such functions have ceased (they have died), or because they never had such functions and are classified as digitales.com.aus forms of life exist, such as plants, animals, fungi, protists, archaea, and bacteria. Clitellates (about 10, species).These have few or no chetae per segment, and no nuchal organs or parapodia. However, they have a unique reproductive organ, the ring-shaped clitellum ("pack saddle") around their bodies, which produces a cocoon that stores and nourishes fertilized eggs until they hatch or, in moniligastrids, yolky eggs that provide nutrition for the digitales.com.au: ParaHoxozoa. Alzheimer's disease (AD), also referred to simply as Alzheimer's, is a neurodegenerative disease that usually starts slowly and progressively worsens. It is the cause of 60–70% of cases of dementia. The most common early symptom is difficulty in remembering recent events. As the disease advances, symptoms can include problems with language, disorientation (including easily getting lost Specialty: Neurology. |
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Life is a characteristic that distinguishes physical entities that have biological processes , such as signaling and self-sustaining processes, from those that do not, either because such functions have ceased they have died , or because they never had such functions and are classified as inanimate. Various forms of life exist, such as plants , animals , fungi , protists , archaea , and bacteria. Biology is the science concerned with the study of life. There is currently no consensus regarding the definition of life. One popular definition is that organisms are open systems that maintain homeostasis , are composed of cells , have a life cycle , undergo metabolism , can grow , adapt to their environment, respond to stimuli , reproduce and evolve. Other definitions sometimes include non-cellular life forms such as viruses and viroids. Abiogenesis is the natural process of life arising from non-living matter, such as simple organic compounds. The prevailing scientific hypothesis is that the transition from non-living to living entities was not a single event, but a gradual process of increasing complexity. Life on Earth first appeared as early as 4. Complex organic molecules occur in the Solar System and in interstellar space , and these molecules may have provided starting material for the development of life on Earth.
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An organ system is a group of organs that work together to perform a complex function. There are eleven organ systems in the human body. All of these are required for survival, either of the person or of the species.
When we think of—and talk about—the circulatory systemwe're usually talking about the cardiovascular system, which includes the:. The circulatory system transports oxygen nutrients to all corners of the body and carries away byproducts of metabolism.
Blood pressure that's too high puts undue stress on other organs and tissues. Low blood pressure means the blood—and its nutrients—won't make it to where it needs to go. The heart and blood vessels are not the only organs circulating fluid around the body, and blood is not the only circulated fluid. The lymphatic system transports lymph a fluid using:.]
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