"The Human Body's Perception of the External Environment" Regulation of Human Life Activities PPT Courseware 4

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"The Human Body's Perception of the External Environment" Regulation of Human Life Activities PPT Courseware 4

1. The structure of the eyeball

Observe and think

Observe the schematic diagram of the structure of the human eyeball and the structure of the camera and discuss:

The principle of camera imaging is the lens imaging principle in physics. When taking pictures, the lens plays the role of adjusting the image distance, the aperture plays the role of controlling light, and the film plays the role of photosensitivity

The lens is the equivalent of a camera lens;

The pupil is equivalent to the aperture;

Retina is equivalent to film

2. The formation of vision

Light passes through the cornea and aqueous humor, enters the interior of the eyeball from the pupil, and then is refracted by the lens and vitreous body to form a clear object image on the retina. The object image stimulates the photoreceptor cells on the retina, and the generated nerve impulses are transmitted along the optic nerve to the cerebral cortex. The visual center forms vision.

Can vision be formed when an object is imaged on the retina? If not, what else needs to go through to form vision?

There are light-sensitive cells on the retina. These cells transmit image information to a certain area of ​​the brain through the optic nerve, so that people can have vision.

1. The imaging positions and correction methods of myopia are ( )

A. The image is in front of the retina and a concave lens should be worn;

B. The image is in front of the retina and a convex lens should be worn;

C. The image is formed behind the retina and a concave lens should be worn;

D. The image is formed behind the retina and a convex lens should be worn.

2. Normal people can see objects clearly regardless of whether they are near or far away. This is because ( )

A. The retina can adjust its forward and backward movement;

B. The curvature of the lens can be adjusted;

C. Pupils can expand and contract;

D. The optic nerve can conduct image information.

3. For the reflected light from external objects entering the eyeball, the most important structure that has a refractive effect is ( )

A. Cornea; B. Water chamber; C. Lens; D. Vitreous body

4. People compare eyes to automatic cameras. The following structure with film function is ( ).

A. Choroid; B. Retina; C. Iris; D. Cornea.

3. Ear and hearing protection

1. Reduce and eliminate noise;

2. Do not pick your ears with sharp objects;

3. When encountering loud noises, quickly open or close your mouth or block your ears;

4. Inflammation in the nasopharynx must be treated promptly;

5. Prevent sewage from entering the external auditory canal.

Knowledge extension:

Nose - sense of smell

Tongue - taste (sour, sweet, bitter, salty)

Skin - touch (cold, heat, pain, touch, pressure, etc.)

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Update Time: 2024-07-08

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