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Organ System Tic-Tac-Toe

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Riley Morris

on 23 February 2011

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Transcript of Organ System Tic-Tac-Toe

The Nervous System by Riley Morris
6th period nervous system - receives and sends electrical messages throughout the body The nervous system is made up of the brain, spinal cord, and peripheral nerves.
The main organs are divided into two seperate systems, the peripheral nervous system and the central nervous system. The brain and the spinal cord are in the central nervous system. Brain
-weighs 3 pounds
-has 3 segments, the fore brain, mid brain, and the hind brain The brain is the center of commands. It monitors conscious and unconscioius processes of the body. The spinal cord is a bundle of nerves that run down the back from the brain in the spinal column. Spinal Cord
-40 centimeters in length, as wide as a thumb
-function is to relay all impulses, and sensations from the body internally and externally to the brain There are 31 pairs of spinal nerve that branch off to different parts of the body. The cervical region supply information to the back of the head, neck, shoulders, arms, hands, and diaphragm. Nerves of the thoracic region supply information to the chest and parts of the abdomen. The lower back, thighs, and legs are fed information by the lumbar region. There are five special sensory organs that help the brain know more of external factors. The eyes help you to see. The lens magnify the image and rotates it against the retina. The retina translates the image formed and lights it by a set of cells. The rods and cones convert the image to nerve impulses transmitted along an optic nerve. Finally, the nerves impulses reach the brain which converts it to memory. The ears help you to hear. The sound waves are translated into vibrations and transmitted to a nerve that sends it to the brain. The brain then stores it into its memory. The tongue is divided into 4 sections, to detect bitter, salty, sour, and sweet. The taste buds convert nerve impulses that are sent to the brain. The brain chooses between different tastes and helps you like or dislike foods. The nose helps you to know smells. Tiny hair cells capture smells and send nerve impulses through a complicated route that ends at the smell sensory cortex of the brain. The smell sensory cortex is the part located between the eye and the ear. The brain interprets the smell and stores it in its memory. #4 #3 #1 #2
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