05. The 5 Senses

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Cards (8)

Skin: The Sense of Touch
The terminal branches of dendrites of sensory neurons in your skin, end with special sensory structures called receptors.
Each receptor is suited to receive only one type of stimulus and to start impulses to the central nervous system.
There are receptors for touch, pain, pressure, heat and cold
Tongue: The Sense of Taste
Taste results from chemical stimulation of certain nerve endings.
Your sense of taste is centered in taste buds which are unevenly distributed over the surface of your tongue, which contain taste receptors.
You can taste food when food mixes with your saliva and enters the pores of the taste buds.
Taste buds cannot activate without saliva
Saliva
the mixture of enzyme and water
Salivary Analyse
produced by salivary glands
2 Salivary Glands: bottom and back of tongue
Nose: The Sense of Smell
Smell also results from chemical stimulation of the nerves, except odors in the form of gases.
The nasal passages are found in 3 layers of cavities separated by bony layers called turbinates.
The stimulation of ending of olfactory nerves by odors results in the sensation of smell
Ear: The Sense of Hearing and Balance
Ear is a complex sensory organ. It provides you with hearing and equilibrium.
Ear has 3 main parts: external, middle and inner ear.
The snail-shaped cochlea changes the vibrations from the middle ear into nerve signals.
These signals travel to the brain along the cochlear nerve, also known as the auditory nerve. The semicircular canals look like three tiny connected tubes that helps you to balance
Eyes: The Sense of Sight
Light is responsible for vision.
Light rays enter your eyes and are bent by the cornea and lens.
These rays cross and focus on the retina. The images of objects you see are inverted.
When light strikes the receptors, nerve impulses are created and are transmitted to the brain via optic nerve.
The brain makes an interpretation of inverted images on the retina.