The human eye can form clear images of objects at various distances.
Label structures D, E, and F on the diagram of the eye.
Choose from the words in the box below:
[iris, pupil, retina, sclera, suspensory ligament]
- D: ______
- E: ______
- F: ______
When a person looks at a distant object, the light rays must be refracted less by the lens. How does the lens change to refract light less?
- By becoming thicker
- By becoming thinner
- By becoming opaque
Which two structures actively control the shape of the lens during accommodation?
- Ciliary muscles
- Iris
- Pupil
- Retina
- Suspensory ligaments
Name the specific structure at the back of the eye where light rays must focus to form a sharp image.
A person reflexively blinks when an object flies toward their face. The sequence below shows the pathway of this reflex action:
- Stimulus: Object moving towards face
- Receptor: ________
- Coordinator: ________
- Effector: ________
- Response: Blinking
Complete the sequence by selecting the correct word from the box below for each of the boxes 2, 3, and 4:
[brain, cornea, iris, muscles, retina]
- Receptor (2): ________
- Coordinator (3): ________
- Effector (4): ________