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 :)
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.
nerve chord
Astrocytes
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 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 largest gland is liver and most complex organ is brain .
The portion of the nervous system that is most closely associated with the contraction of the cardiac muscle is the autonomic nervous system.
The cerebrum is part of the central nervous system, specifically within the brain. It is the largest part of the brain and is responsible for most higher brain functions such as thought, memory, and voluntary movement.
Saturn has the largest and most extensive ring system in the Solar System. It is composed of countless particles of ice and rock orbiting the planet in a disk-like structure.
Tastes good lightly salted, and is less fat then other organs.
The nervous system is considered the most complex system in the body. It coordinates all the body's activities, processes sensory information, and allows for communication between different parts of the body through a network of specialized cells called neurons. The brain, spinal cord, and peripheral nerves make up the nervous system.