nerve chord
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.
atoms and molecules --> cell --> tissue --> organ --> organ system --> organism
Not all animals have complex nervous systems. In fact, most lower animals don't even show an organized nervous system. Its only in higher animals like chordates that a proper organized nervous system is seen.
The animal kingdom most commonly possesses a nervous system, which allows animals to sense their environment, process information, and respond to stimuli. The nervous system is responsible for coordinating various activities within an organism.
The nervous system needed a big boss to manage all the neurological parts of the organism. The brain organizes everything and it transmits directives to all organs. The neurological big boss has a hard task to guarantee that all organs are able to work precisely.
The nervous system needed a big boss to manage all the neurological parts of the organism. The brain organizes everything and it transmits directives to all organs. The neurological big boss has a hard task to guarantee that all organs are able to work precisely. -Cutieful :)
Just switch population with ecosystem to get them most to least complex.
The nervous system comprises the body's total response mechanism. It receives external information, sends that info to the brain for processing, and sends messages from the brain about appropriate response to the effector muscles and glands.
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.
The multicellular organism contains two or more cells. They also own an organ system which contains tissues and organs.
The portion of the nervous system that is most closely associated with the contraction of the cardiac muscle is the autonomic nervous system.
Tastes good lightly salted, and is less fat then other organs.