What do you see?
One of these women have switched positions – are they the same size?
Optical Illusions Our eyes are made up of some of the most amazing tissues in the body. However, understanding what we see mostly happens in the brain, which is why even someone with perfect vision is still susceptible to optical illusions!
What body system plays a large role in helping your eyes interpret images? Integumentary System Digestive System Nervous System Circulatory System
The Nervous System
Cerebrum – responsible for voluntary activities Parts of the cerebrum include: Frontal Lobe: reasoning, emotions, judgment, & voluntary movement Occipital Lobe: vision & reading ability Parietal Lobe: sensory centers Temporal Lobe: centers of hearing & memory
Cerebellum: responsible for coordinated body movements Corpus Callosum: connects the right & left sides of the brain
Medulla Oblongata: controls the functions of internal organs Pons: joins the hemispheres of the cerebellum & connects the cerebrum with the cerebellum
What role does the nervous system play in the functions of the body? Controls & coordinates functions throughout the body & responds to internal & external stimuli 2 parts: Central Nervous System: brain & spinal cord Peripheral Nervous System: neurons
Neurons Nerve cells that carry messages throughout the nervous system Video to 2:10 Neurons Nerve cells that carry messages throughout the nervous system Sensory Neurons: carry impulses from sense organs to spinal cord & brain Motor Neurons: carry impulses from brain & spinal cord to muscles & glands Interneurons: connect sensory & motor neurons
The neurons that tell you to move your hand off of a hot stove are – Sensory Neurons Motor Neurons Interneurons All of the above
The neurons that send signals from the eye to the brain are – Sensory Neurons Motor Neurons Interneurons All of the above
Fun Fact! The largest nerve in the human body is the sciatic nerve. It’s composed of hundreds of neurons & runs from the lower back to the bottom of the foot!
Neuron (Nerve Cell) Dendrites receive signals from other cells Axons deliver signals to other cells
Neurons connect end to end in order to send electrical signals throughout the body!
What are the 2 divisions of the Peripheral NS? Brain & Spinal Cord Thalamus & Hypothalamus Autonomic & Somatic Sensory & Motor Functions Sensory & Motor Functions! Your Peripheral NS controls the sensory & motor neurons.
Autonomic vs. Somatic Nervous Systems Somatic NS: reflexes & voluntary actions Autonomic NS: involuntary (such as changing heart rate)
Autonomic & somatic responses are controlled by which division of the NS? Central Nervous System Peripheral Nervous System Peripheral NS! It’s the motor neurons that send the signals to your muscles to move, voluntarily or involuntarily.
Your heart beating: Somatic Autonomic Both Neither
Turning a page: Somatic Autonomic Both Neither
Chewing food: Somatic Autonomic Both Neither
Digesting food: Somatic Autonomic Both Neither
Breathing: Somatic Autonomic Both Neither
Shingles Disease that occurs in the nerve cells & causes a painful rash Can be treated with lotions or antiviral medications Shingles is caused by the same virus that causes Chicken Pox. If you’ve had Chicken Pox, the Shingles virus is already inside you!
Epilepsy Video to 1:50 Disease caused by overactive brain cells, which leads to seizures Treated with medications & sometimes surgery The most common type of epilepsy originates in the temporal lobe of the cerebrum.
What are some ways to sharpen & strengthen your nervous system? Before you leave, answer the following question on a sheet of paper (share!): What are some ways to sharpen & strengthen your nervous system?