The brain
organ system
Organ systems are most complex and fragile starting with the atoms. The most complex organ systems is the organism. In between are the molecules, cell, tissue, organ, and organ system.
The brain is the most important organ of the nervous system. The spinal cord and the brain are the main parts of the nervous system but the spinal cord is not considered to be an organ.
kidneys
lungs
The lungs.
Kidney
YES it is an organ system?
The skeletal system is the organ system that works most closely with the muscular system.
Cell: the basic unit of life, consisting of a cell membrane, cytoplasm, and genetic material. Tissue: a group of similar cells that work together to perform a specific function in the body. Organ: a structure made up of different types of tissues that work together to perform a specific function. Organ system: a group of organs that work together to carry out complex functions in the body. Organism: an individual living being, made up of various organ systems working together to maintain life.
Cell, tissue, organ, organ system Atom, molecule, cell, tissue Organ system, tissue, cell, organ Molecule, tissue, organ, organ system The correct order is 2. Atom, molecule, cell, tissue.
The group of organ systems organized from most complex to least complex typically starts with the nervous system, then the circulatory system, followed by the respiratory, digestive, excretory, endocrine, and finally the integumentary system.