Download A Concept Map

A Concept Map THE SENSORY ORGANS The Eye •  The eye is the sensory organ related to vision. •  It picks up light rays given off by light sources or reflected from objects. The Anatomy of the Eye Video •  hBp://www.youtube.com/watch?
v=fn6v3SkH0LI How it Works •  The lens of the eye funcOons like a camera lens. •  It changes shape depending on the distance of the object. How Does the Message get to Your Brain? •  The nerve cells in the reOna are called photo-­‐
receptors. –  These receptors convert light into nerve impulses. •  There are 2 kinds of photo-­‐receptors: –  Cones: Perceive colors –  Rods: Perceive differences in light intensity How Does the Message get to Your Brain? •  Nerve impulses are carried through the opOc nerve. •  The opOc nerve leads to the brain, where informaOon is analyzed and processed. •  This process happens for each eye. The Ear •  The ear is the sensory organ associated with hearing. •  It picks up sound and turns it into nerve impulses. •  The ear is divided into 3 secOons: –  The Outer Ear –  The Middle Ear –  The Inner Ear The Anatomy of the Ear Video •  hBp://www.youtube.com/watch?v=dCyz8-­‐
eAs1I How Sound Travels to the Brain •  Sound waves are vibraOons in the air. •  These vibraOons travel through the ear and into the cochlea. How Sound Travels to the Brain •  The nerve cells (sensory receptors) lining the cochlea begin to vibrate. •  This creates nerve impulses that travel to the the brain. •  These impulses travel along the auditory nerve to get to the brain. The Skin •  This is the sensory organ associated with touch. •  It is a very large organ that covers the enOre surface of the body. •  There are 3 disOnct layers: –  The epidermis –  The dermis –  The hypodermis The Skin The Skin •  There are different types of sensaOon for the skin: –  TacOle sensaOons (touch, pressure) –  Thermal sensaOons (heat, cold) –  Painful sensaOons (pain) •  There are special receptors for each of these sensaOons. These receptors lead to sensory nerves that lead to the brain. The results Scents: Number Scent 1 Lemon 2 Vinegar 3 Mint 4 Almond 5 Cinnamon 6 Banana 7 Raspberry 8 Orange 9 Vanilla 10 Coffee •  Tastes: Different foods Sour Sweet Sweet Sweet BiBer Salty The Nose •  The nose is the sensory organ associated with smell. Sensory receptors are located in the upper wall of the nasal cavity. The Nose •  The part of the olfactory epithelium with most sensory receptors is called the olfactory bulb. •  The olfactory bulb connects to the olfactory nerve. •  The olfactory nerve transmits nerve impulses to the brain. The Tongue •  This is a muscle scaBered with sensory receptors for taste. •  The taste buds are the sensory receptors for taste. The Tongue •  Humans are capable of tasOng 5 different tastes: 1. 
2. 
3. 
4. 
5. 
Sweet Sour Salty BiBer Umami (A recently named taste for foods like aged meat) •  All taste buds can taste all 5 tastes. •  There are 3 nerves that lead from the tongue to the brain. A Summary •  SOmulus (light)  ReOna  Cones and Rods  OpOc Nerve  Brain •  SOmulus (Sound)  Cochlea  Auditory Nerve  Brain •  SOmulus (Touch/pain/temperature)  specific sensory receptor  sensory nerve  brain •  SOmulus (Smell)  Olfactory Epithelium  Olfactory Bulb  Olfactory Nerve  Brain •  SOmulus (taste)  taste buds  taste related nerves  brain.