Presentation on theme: "The Nervous System! Controls all other systems!!!."— Presentation transcript:
The Nervous System! Controls all other systems!!!
Main Function of the Nervous System To receive stimuli from inside and outside of the body, to interpret the stimuli, and initiate responses for survival.
Division of the Nervous System Central Nervous System (CNS) – Brain – Spinal Cord Peripheral Nervous System (PNS) – Peripheral nerves – Somatic and Autonomic Systems
Central Nervous System (CNS) Organ functions – Brain: coordinates all of the body’s activities – Spinal cord: connects the brain to the peripheral nerves Jellyfish have no brain! Human Sheep Cat
The Brain Cerebrum: Controls thoughts, voluntary actions, and sensations related to five senses. Cerebellum: Coordinates *voluntary muscle* movements and balance. Brain stem: Located at the base of the brain and controls vital and *involuntary* processes (ex’s: breathing, heart beat, and digestion) Fun fact: It weighs about 3 lbs
Human Sheep Cat Cerebrum Cerebellum Brain stem
Spinal Cord A bundle of nerves that begins at the brain stem and connects to the peripheral nerves Vertebrae protect the spinal cord
Central Nervous System (CNS) Organs and Functions Brain Spinal Cord
Peripheral Nervous System Connects the brain and spinal cord to other body parts.
Communication is Key How does the nervous system communicate? Neurons and neurotransmitters
Reflexes An involuntary, automatic response to a stimulus. Reflex arc
Examples of Reflexes *Knee jerk (helps stand upright) *Blinking (protects eyes; cleans them) *Arm raise (protects face) Coughing (clears airways when irritated) Sneezing (clears airways when irritated) Goosebumps (warm up body) Shivering (warm up body)
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