Sensory adaptation - Getting used to a stimulus. Like hot bath or Nasal fatigue or clothes against your skin.
Pheromones - Trigger a social response (alarm or sexual). Odorless chemicals secreted by 1 sex and act on the opposite sex.
*Smell - Chemoreceptors - Stimulated by dissolved molecules (taste) or airborne molecules that become dissolved (smell).
Olfactory cell - Can recognize 7 distinct odors and with combinations of these 7 we can identify hundreds of smells.
*Taste - Chemoreceptors - The molecules have to be dissolved in something like saliva before the taste buds can detect it.
Taste buds - Once it is dissolved they can recognize sweet, salty, bitter, and sour and umami. Flavor is really a combination of taste, temperature, texture, and smell.
Umami - detects MSG - Is a meat-like flavor. Put in snack foods to make you want more.
*Temperature - Thermoreceptors - Are stimulated by temperature.
Warm receptors - Increase firing when warmed.
Cold receptors - Increase firing when cooled.
*Vision - Photoreceptors - Are stimulated by light.
Cornea - Outer part of the eye.
Iris and Pupil - A hole which is surrounded by the iris - colored part.
Lens - Focuses the image onto the retina.
Retina - The layer of the eye with the photoreceptor cells and lies on top of the optic nerve.
Vitreous humor - The clear jelly that fills the inside of the eye.
Optic nerve - Photoreceptors send the message to the optic nerve (axons) that leaves the eye and goes to the occipital lobe of the brain.
Rods - Used for Coarse vision - Used for dim light vision and only see in black and white.
Cones - Used for Sharp color vision - Used in bright light for color vision. There are 3 kinds of cones red, green, and blue.
Fovea - A depression in the center of the retina that is packed with cones where the lens focuses the image onto.
*Ears - Mechanoreceptors - They are mechanically stimulated.
Hair cell - A common type of Mechanoreceptor. They are used for touch, hearing, balance, and pressure.
*Balance - Mechanoreceptors - Located in the inner ear.
Vestibular apparatus - Contains the mechanoreceptors for balance.
3 Semicircular canals - These are the main part of the vestibular apparatus and they contain fluid and tiny rocks.
*Hearing - Mechanoreceptors - They are found in the inner ear (cochlea).
Pinna - Funnels sound down into the ear canal.
Ear Canal - In the outer ear to cary sound to the tympanum.
Tympanum (Ear drum) - Vibrates when sound strikes it.
Middle ear - Between the tympanum and the cochlea.
Ossicles - 3 tiny bones that send the sound vibrations to the cochlea.
Inner ear - Contains the vestibular apparatus (balance) and the hearing mechanism (cochlea).
Cochlea - the coiled tubular structure containing the hair cells for hearing.
Cornea --> Pupil --> Lens --> Retina --> Optic nerve --> Brain (occipital lobe)
Pinna --> Ear Canal --> Tympanum --> Ossicles --> Cochlea