Major functions of the CNS( Central Nervous System)
- Carry information
- Coordinate reflexes
- Control reflexes
- Sensory output
Diagram:
- Carry information
- Coordinate reflexes
- Control reflexes
- Sensory output
Diagram:
Path of nerve impulses:
1. An external stimulus (sound, touch, taste, smell, sight) triggers the sensory receptor.
2. The signal travels along the bundle of axons until it reaches the spinal cord.
3. Then the impulse travels through the white matter to the gray matter
4. Once the stimulus reaches the brain, the appropriate brain lobe makes a "decision," which can be conscious or unconscious, and sends information back down the spinal cord, reversing the electrochemical process.
5. leaving the spinal cord at the proper point, the low-voltage signal travels back along a peripheral nerve to a neuromuscular junction, a place where the muscle tissue is highly excitable. The signal leaves the nerve and spreads around the muscle, causing contraction or expansion.
1. An external stimulus (sound, touch, taste, smell, sight) triggers the sensory receptor.
2. The signal travels along the bundle of axons until it reaches the spinal cord.
3. Then the impulse travels through the white matter to the gray matter
4. Once the stimulus reaches the brain, the appropriate brain lobe makes a "decision," which can be conscious or unconscious, and sends information back down the spinal cord, reversing the electrochemical process.
5. leaving the spinal cord at the proper point, the low-voltage signal travels back along a peripheral nerve to a neuromuscular junction, a place where the muscle tissue is highly excitable. The signal leaves the nerve and spreads around the muscle, causing contraction or expansion.
Sympathetic System:
accelerates heart rate; widen bronchial passages; decrease motility (movement) of the large intestine; constrict blood vessels; increase peristalsis in the esophagus; cause pupillary dilation, piloerection (goose bumps) and perspiration (sweating).
Parasympathetic System:
conserves energy as it slows the heart rate, increases intestinal and gland activity, and relaxes sphincter muscles in the gastrointestinal tract.
accelerates heart rate; widen bronchial passages; decrease motility (movement) of the large intestine; constrict blood vessels; increase peristalsis in the esophagus; cause pupillary dilation, piloerection (goose bumps) and perspiration (sweating).
Parasympathetic System:
conserves energy as it slows the heart rate, increases intestinal and gland activity, and relaxes sphincter muscles in the gastrointestinal tract.
How it works with other systems??
Skeletal system-
Bones provide calcium that is essential for the proper functioning of the nervous system.
Muscular system-
Receptors in muscles provide the brain with information about body position and movement.
Fun Facts!!!!
1. There are more nerve cells in the human brain than there are stars in the Milky Way
2. If we lined up all the neurons in our body it would be around 600 miles long
3. There are 100 billion neurons in your brain alone
4. A newborn baby's brain grows almost 3 times during the course of its first year
5. The left side of human brain controls the right side of the body and the right side of the brain controls the left side of the body
Diseases
Multiple Sclerosis- A disease of unknown cause that manifests as multiple hard plaques of delegation of the insulating layer of nerve fibers in the Central Nervous System.
Cardiovascular accident- blood flow to a part of your brain is stopped either by a blockage or a rupture of a blood vessel.
Skeletal system-
Bones provide calcium that is essential for the proper functioning of the nervous system.
Muscular system-
Receptors in muscles provide the brain with information about body position and movement.
Fun Facts!!!!
1. There are more nerve cells in the human brain than there are stars in the Milky Way
2. If we lined up all the neurons in our body it would be around 600 miles long
3. There are 100 billion neurons in your brain alone
4. A newborn baby's brain grows almost 3 times during the course of its first year
5. The left side of human brain controls the right side of the body and the right side of the brain controls the left side of the body
Diseases
Multiple Sclerosis- A disease of unknown cause that manifests as multiple hard plaques of delegation of the insulating layer of nerve fibers in the Central Nervous System.
Cardiovascular accident- blood flow to a part of your brain is stopped either by a blockage or a rupture of a blood vessel.