"The Human Body's Perception of the External Environment" Regulation of Human Life Activities PPT Courseware 5

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"The Human Body's Perception of the External Environment" Regulation of Human Life Activities PPT Courseware 5

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1. We can see: ___ sense; smell: ___ sense; taste: ___ sense; feel with fingers: ___ sense; hear: ___ sense. Therefore, the eyes, nose, tongue, skin, ears and other sensory organs of the human body have different receptors.

2. According to scientists’ statistics, most of the information we obtain from the outside world comes from ___ sleep.

3. The formation process of vision is roughly as follows: the light reflected from external objects passes through the cornea, pupil, lens and vitreous body in sequence, and is refracted by ______, and finally falls on ______, forming an object image.

4. When a person moves from a light place to a dark place, his pupils will change___.

5. Due to the curvature of ______ and even the front-to-back diameter of the eyeball ___, the object image formed is in front of ______, making it difficult to see distant objects. This is called myopia. Wear ______ to correct it.

6. In order to prevent myopia, we must achieve ______ and ______.

2. The formation of vision

1. Please describe the imaging process based on observing the picture above.

2. The part where the object image is formed: ____________________.

Can vision be formed when an object is imaged on the retina?

cannot. The photoreceptor cells on the retina transmit the object image to the visual center of the brain through the optic nerve, so that people can produce vision.

The parts that form the object image are: ____________________;

The part where vision is formed is: ____________________.

Three conditions for visual formation:

1. The structure of the eyeball is intact

2. No damage to the optic nerve

3. The visual center of the cerebral cortex is normal.

normal eye

The light reflected from distant objects is refracted by the lens and forms an image that falls on the retina.

Myopia

The lens becomes excessively convex or the front-to-back diameter of the eyeball is too long, causing the object image to fall in front of the retina.

Summary:

1. What do we know from studying this lesson?

2. What other questions do you want to ask?

Meeting standards and improving

1. People’s “white eyeballs” and “black eyeballs” actually refer to ( )

A. Iris and cornea B. Cornea and sclera

C. Cornea and iris D. Sclera and iris

2. In the process of vision formation, the parts that form object images and produce vision are ( )

A. Retina, retina B. Cerebral cortex, cerebral cortex

C. Retina, cerebral cortex D. Cerebral cortex, retina

3. The structure with photoreceptor cells in the eyeball is ( )

A. Cornea B. Sclera

C. Choroid D. Retina

4. The lenses worn to correct myopia are: ( )

A. Plane mirror B. Concave lens

C. Convex lens D. Concave mirror

5. The light emitted by external objects passes through ( ) in sequence and reaches the retina.

A. Pupil, cornea, lens, vitreous body

B. Pupil, cornea, vitreous body, lens

C. Cornea, pupil, lens, vitreous body

D. Cornea, pupil, vitreous body, lens

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Update Time: 2024-07-08

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