Organ system, organ, tissue, cell, organelle
Which of the following lists levels of human structure from the most complex to the simplest?
Organ system: An organ system refers to a group of organs that work together to perform specific functions in the body. Examples of organ systems include the circulatory system, digestive system, respiratory system, and nervous system.
Organ: An organ is a structure made up of two or more types of tissues that work together to perform a specific function in the body. Examples of organs include the heart, liver, lungs, and kidneys.
Tissue: A tissue refers to a group of similar cells that work together to perform a specific function in the body. Examples of tissues include muscle tissue, nervous tissue, and epithelial tissue.
Cell: A cell is the smallest structural and functional unit of an organism. Cells are responsible for carrying out all the functions necessary to sustain life, such as respiration, metabolism, and reproduction.
Organelle: An organelle refers to a specialized structure within a cell that performs a specific function. Examples of organelles include the mitochondria, nucleus, and ribosomes.
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