Question

How many systems are there in the human body?

Answer 1

Hint: 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.