Nervous system

• Sensory function: Gathered information both inside and outside the body.
• Integration Function: Processes the information in the brain and spine.
• Motor Function: Sends information to the muscles, glands, and organs so they can respond appropriately.
• Brain: this is an organ located within the skull. It functions as organizer and distributor of knowledg.
• Cerebrum: large upper portion of the brain that control’s activity & thought.
• Cerebellum: controls muscle coordination, balance, and posture.
• Brain stem: connects the brain and spinal cord which controls automatic function like breathin, digestion, pulse and vital sign.
• Central Nervous System: works as the processing center for the nervous system which is made up of the brain and the spinal cord.
• Spinal cord: this is a channel for signals between the brain and thud the rest of the body.
• Peripheral Nervous System: connects to the CNS to the organs and limbs.
• What two main divisions of the Peripheral Nervous System (PNS)?

  Somatic Nervous System & Autonomic Nervous System
• Somatic Nervous System: is made up of nerves that link the brain and spinal cord.
• Two kinds of nerves in Somatic NS

  Spinal nerves & Cranial Nerves
• Autonomic Nervous System: this system is associated with the involuntary control of body movements and has two divisions
• Sympathetic Nervous System : prepares us for action, increases heart rate, dilates pupils, etc.
• The parasympathetic nervous system “decreases” the heart rate, while the sympathetic nervous system “increases” the heart rate
• Nerve cell: is the basic unit of nervous system
• Dendrite: a small branched extension spread out from the cell body which receives and carries impulses towards the cell body.
• Axon: The long, thin fibers that carry nerve impulses away from the cell body.
• Three Types of Neurons: Sensory Neurons, Motor Neurons, Interneurons
• Three types of neurons

  Sensory Neurons, Motor Neurons, Interneurons
• Sensory Neurons: carry impulses from the sense organs and deliver it to the brain and spinal cord (the CNS).
• Motor Neurons : carry impulses from the brain or spinal cord to muscle, glands, and other neurons.
• Interneurons : connect the sensory and motor neurons which carry impulses between them.
• Nerve Impulse : is a combination of an electrical charge and chemical reaction.
• when a nerve impuls comes to the end of an axon; it produces the chemical, called “neurotransmitter”.
• synapse: the chemical crosses the space between neurons called “synapse” and stimulates the nerve impuls to start in the next dendrite.