Vision 1
This clear front part of the eye acts like a window that lets light enter.
Answer: What is the cornea?
This black opening in the center of the eye allows light to enter.
Answer: What is the pupil?
The outermost layer of the skin.
→ What is the epidermis?
The skin layer found beneath the outer layer.
→ What is the dermis?
This is why the epidermis can protect against germs.
→ What is that its outer cells are dead and hardened?
This white outer covering of the eyeball helps protect and support the eye.
Answer: What is the sclera?
This colored part of the eye controls how much light enters the pupil.
Answer: What is the iris?
This skin layer contains blood vessels and nerves.
This skin layer contains blood vessels and nerves.
→ What is the dermis?
This layer of skin is made mostly of dead cells.
→ What is the epidermis?
Keratin is also found in these two structures besides skin.
→ What are hair and nails?
This watery fluid flows through the pupil and keeps the cornea and lens moist.
Answer: What is aqueous humor?
This structure changes shape to help you focus on near and far objects.
Answer: What is the lens?
What are three functions of the outer layer of skin?
protection
locks in moisture
keeps germs and bacteria out
is waterproof
Hair follicles, oil glands, and sweat glands are found here.
→ What is the dermis?
This protein makes skin cells tough and waterproof.
This is why scraping off skin doesn’t usually cause bleeding.
→ What is keratin?
→ What is that the outer skin cells are dead?
This nerve carries visual signals from the eye to the brain.
Answer: What is the optic nerve?
1. These cells in the retina help you see color and fine details.
2. These retinal cells allow you to see in dim light but not in color.
1. Answer: What are cones?
2. Answer: What are rods?
This layer allows you to feel pressure, temperature, and touch.
→ What is the dermis?
This layer helps keep you warm like a wet suit.
Hair grows from this small pocket in the skin.
→ What is the hypodermis?
hair follicle
The thickest skin on the body is found here.
The thinnest skin on the body is found here.
Dust in your home is often made of these.
Adults shed about this much skin per year.
→ What are the soles of the feet (and palms)?
→ What are the eyelids?
→ What are shed skin cells?
→ What is 1–2 pounds?
1. When the image is focused in front of the retina, a person has this condition.
2. When the image is focused behind the retina, a person has this condition.
1.Answer: What is nearsightedness (myopia)?
2.Answer: What is farsightedness (hyperopia)?
This vision problem occurs when the cornea bends light unevenly, causing blurry vision.
Answer: What is astigmatism?
This pigment gives skin, hair, and eyes their color.
It helps protect the body from this type of radiation.
This skin change happens when melanin production increases.
→ What is melanin?
→ What is ultraviolet (UV) radiation?
→ What is tanning?
The process by which skin cells harden and die.
Skin cells die because they lose access to this.
New skin cells push older cells in this direction.
→ What is keratinization?
→ What is blood (or nutrients)?
→ What is upward?
This is why bright light causes the pupil to get smaller.
Glasses help vision by changing this about light.
What does being near sighted mean? What does being farsighted mean?
→ What is to protect the retina from damage?
→ What is how light bends?
→ NEAR-sighted = NEAR is clear
Light focuses in front of the retina
Instead of landing on the retina
far sighted -Far things → clearer Light focuses behind the retina.