Cow's eye dissection: examining the retina and vitreous humor.
Close-up of a dissected cow's eye, showing the vitreous humor and retina being examined.
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Show Answer Key & Explanations
Step-by-step solution for: Solved Name Date Period Cows Eye Dissection Lab Page 2 7. | Chegg.com
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Show Answer Key & Explanations
Step-by-step solution for: Solved Name Date Period Cows Eye Dissection Lab Page 2 7. | Chegg.com
Let’s go through each question one by one, using what you’ve learned from the lab page and basic eye anatomy.
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7. List the two functions of the lens.
The lens in the eye has two main jobs:
- It focuses light onto the retina so you can see clearly.
- It changes shape (gets thicker or thinner) to help you focus on things that are close up or far away — this is called accommodation.
✔ Final Answer for #7:
• Focuses light onto the retina
• Changes shape to adjust focus for near and far objects
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8. Describe the iris and explain its function.
The iris is the colored part of your eye (like blue, brown, green). It’s a muscle that controls how big or small the pupil gets.
Its job is to control how much light enters the eye. In bright light, it makes the pupil smaller. In dim light, it makes the pupil bigger.
✔ Final Answer for #8:
The iris is the colored ring around the pupil. Its function is to control the size of the pupil to regulate how much light enters the eye.
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9. Describe the pupil.
The pupil is the black circle in the center of your eye. It’s not actually a thing — it’s just an opening (a hole) that lets light into the eye. The iris surrounds it and changes its size.
✔ Final Answer for #9:
The pupil is the black circular opening in the center of the eye that allows light to enter. Its size is controlled by the iris.
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10. If you enter a very bright room after being in the dark, what would happen to your pupils – get larger or get smaller?
When you’re in the dark, your pupils get bigger to let in more light. When you suddenly walk into a bright room, your eyes need to protect themselves from too much light — so the pupils shrink (get smaller).
✔ Final Answer for #10:
Get smaller
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11. Why does the optic nerve cause a blind spot? (2 points) Be specific.
Look at section G.d and G.e in the lab page.
The optic nerve is where all the nerves from the retina bundle together to send messages to the brain. But at that exact spot — where the nerve leaves the eye — there are no photoreceptor cells (rods or cones). That means no light detection happens there. So if light hits that spot, your brain doesn’t get any signal → you can’t see anything there → that’s the blind spot.
✔ Final Answer for #11:
The optic nerve causes a blind spot because it exits the eye at a place where there are no light-sensitive cells (photoreceptors). Since no image can be detected at that spot, anything that lands there cannot be seen.
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Final Answer:
7. • Focuses light onto the retina
• Changes shape to adjust focus for near and far objects
8. The iris is the colored ring around the pupil. Its function is to control the size of the pupil to regulate how much light enters the eye.
9. The pupil is the black circular opening in the center of the eye that allows light to enter. Its size is controlled by the iris.
10. Get smaller
11. The optic nerve causes a blind spot because it exits the eye at a place where there are no light-sensitive cells (photoreceptors). Since no image can be detected at that spot, anything that lands there cannot be seen.
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7. List the two functions of the lens.
The lens in the eye has two main jobs:
- It focuses light onto the retina so you can see clearly.
- It changes shape (gets thicker or thinner) to help you focus on things that are close up or far away — this is called accommodation.
✔ Final Answer for #7:
• Focuses light onto the retina
• Changes shape to adjust focus for near and far objects
---
8. Describe the iris and explain its function.
The iris is the colored part of your eye (like blue, brown, green). It’s a muscle that controls how big or small the pupil gets.
Its job is to control how much light enters the eye. In bright light, it makes the pupil smaller. In dim light, it makes the pupil bigger.
✔ Final Answer for #8:
The iris is the colored ring around the pupil. Its function is to control the size of the pupil to regulate how much light enters the eye.
---
9. Describe the pupil.
The pupil is the black circle in the center of your eye. It’s not actually a thing — it’s just an opening (a hole) that lets light into the eye. The iris surrounds it and changes its size.
✔ Final Answer for #9:
The pupil is the black circular opening in the center of the eye that allows light to enter. Its size is controlled by the iris.
---
10. If you enter a very bright room after being in the dark, what would happen to your pupils – get larger or get smaller?
When you’re in the dark, your pupils get bigger to let in more light. When you suddenly walk into a bright room, your eyes need to protect themselves from too much light — so the pupils shrink (get smaller).
✔ Final Answer for #10:
Get smaller
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11. Why does the optic nerve cause a blind spot? (2 points) Be specific.
Look at section G.d and G.e in the lab page.
The optic nerve is where all the nerves from the retina bundle together to send messages to the brain. But at that exact spot — where the nerve leaves the eye — there are no photoreceptor cells (rods or cones). That means no light detection happens there. So if light hits that spot, your brain doesn’t get any signal → you can’t see anything there → that’s the blind spot.
✔ Final Answer for #11:
The optic nerve causes a blind spot because it exits the eye at a place where there are no light-sensitive cells (photoreceptors). Since no image can be detected at that spot, anything that lands there cannot be seen.
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Final Answer:
7. • Focuses light onto the retina
• Changes shape to adjust focus for near and far objects
8. The iris is the colored ring around the pupil. Its function is to control the size of the pupil to regulate how much light enters the eye.
9. The pupil is the black circular opening in the center of the eye that allows light to enter. Its size is controlled by the iris.
10. Get smaller
11. The optic nerve causes a blind spot because it exits the eye at a place where there are no light-sensitive cells (photoreceptors). Since no image can be detected at that spot, anything that lands there cannot be seen.
Parent Tip: Review the logic above to help your child master the concept of cow eye dissection worksheet answers.
