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The Senses.

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Presentation on theme: "The Senses."— Presentation transcript:

1 The Senses

2 Senses in Animals Survival
Used for survival to tell animals what is going on around them Sense organs Ears, nose, tongue, skin, eyes

3 Senses in Animals Planarian Lives in ponds, rivers, and lakes
2 sense organs Knobs– used for detecting water currents Eyespots– only able to tell light from dark

4 Detects sound from the front of the leg
Senses in Animals Earthworms -light detectors -located just below the skin - Cricket Detects sound from the front of the leg Antennas detect feeling Uses a compound eye for seeing

5 Senses in Animals Snake Snakes eyes are similar to human eyes
Snakes use their tongue to smell They shoot their tongue out and it catches air molecules They bring the air back into its mouth , where the sense of smell organ is located

6 Human Sense Organs The Eye Path of light through the eye Sclera Iris
Pupil Cornea Lens Retina Vitreous humor

7 The eye Light passes and bends first through the cornea
Then light passes through the pupil and the lens The light bends again in the lens towards each other Light then passes through the vitreous humor The vitreous humor is clear. The light finally reaches the retina

8 The retina is made up of rods and cones
Rods detect motion and light or dark Cones detect color Cones are nerve cells that detect color There are three types of cones, each type detects only one color-----red, green, or blue All the other colors are cones acting together

9 The optic nerve Carries the message from the eye to the vision
Center of the brain 2 things happen at the vision center The brain interprets the message The image is rotated right-side up

10 The Ear 3 parts Outer, Middle, Inner Outer Ear
The only part that is visible of the entire ear The ear flap helps direct the sound waves into the ear Sound waves travel through the ear canal and bump against the ear drum

11 Middle Ear The vibration of the sound waves cause the anvil, hammer, and the stirrup to move The stirrup is also connected to a membrane that vibrates with the motion of the ear bones

12 Inner ear The cochlea contains nerve cells that are connected to the auditory nerve The auditory nerve takes the message to the brain to be interpreted Semicircular Cells Nothing to do with hearing Helps maintain balance

13 The Tongue The tongue contains taste buds that detect taste
They detect the chemical molecules in food 4 different types Sour Salty Sweet bitter

14 The Nose Detects gas molecules in the air
Neurons line the top of the nasal chamber There are 7 different types of nerve cells in the nose that detect a different odor The olfactory nerve takes messages to your brain and the cerebrum interprets the message

15 The Skin 2 different layers for the skin The epidermis –outside
The Dermis—inner part 5 nerve cell types Pain Pleasure Touch Heat Cold

16 Most nerve cells are found in the dermis
But both the epidermis and the dermis share the pain cell From the skin, the nerve cells travel to the cerebrum to be interpreted They are perceived as cold, hot pain, pleasure, or touch

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