Question
Question: How many systems are there in the human body?...
How many systems are there in the human body?
Solution
In order to serve a common purpose, an organ is a series of tissues joined into a structural unit. Organs occur in most multicellular organisms, including not only humans and other mammals, but plants as well. The functional counterpart of an organ is an organelle in single-celled organisms such as bacteria.
Complete answer:
Organ system: A collection of organs that contribute to the body's basic functions.
Organ: a collection of tissues carefully organised so that they can work together to perform particular functions.
Tissue: a community of cells with a structure and purpose similar to that.
There are eleven organ systems in the human body, each of which includes multiple separate organs. An organ is a distinctive anatomical structure made up of tissue groups that operate in conjunction to perform particular functions. The structures and functions of these eleven organ systems are included in Table .
| Organ System | Function | Organ |
|---|---|---|
| Integumentary | Barrier to organisms and chemicals invadingControlling the temperature | SkinHairSubcutaneous tissue |
| Skeletal | Supporting and shifting the bodySafeguards internal organsStoring mineralsForming blood | BonesCartilageLigamentsBone marrow |
| Muscular | LocomotionProduction of heat | MusclesTendons |
| Nervous | Coordinates other organ systems functionsReacts to stimuli | BrainSpinal cordNervesEyesEars |
| Endocrine | Regulates the functions of the body by chemicals (hormones) | Pituitary glandParathyroid glandThyroid glandAdrenal glandThymusPancreasGonads |
| Cardiovascular | Transports nutrients and oxygen to tissuesEliminates waste goods | HeartBloodBlood vessels |
| Lymphatic | Returns blood to tissue fluidDefends from foreign organisms | SpleenLymph nodesThymusLymphatic vessels |
| Respiratory | Exchange of oxygen / carbon dioxide | LungsTracheaLarynxNasal cavitiesPharynx |
| Digestive | Processes foodsNutrient absorption within the body | StomachIntestinal tractLiverPancreasEsophagusSalivary glands |
| Urinary | Waste ReductionRegulates blood pH and blood volume | KidneysUrinary bladderUrethra |
| Reproductive | Manufactures germ cells (eggs and sperm)Environment for Fetus Growth (female) | OvariesUterusMammary glandsTestesProstate glandExternal genitalia |
Note: We may think of the human body's basic structure and functional organisation as a pyramid or hierarchical structure in which cells and chemicals consist of the lowest level of organisation (the foundation). Organs and organ systems are the highest stages of the organisation of the body.