Sense Organs
Overview
Close one eye and try to thread a needle, and the task suddenly gets harder, not because you can see less, but because you have lost the ability to judge distance accurately. The two sense organs in this topic, the eye and the ear, do far more than simply detect light and sound: they focus, protect themselves from damage, and, in the ear's case, also keep you upright.
This topic covers how the eye focuses on near and distant objects and adjusts to changing light, why two eyes give better depth judgment than one, the common eye defects and how they are corrected, the structure of the ear in hearing and balance, the damage prolonged loud noise can cause, and how the range of frequencies audible to the human ear can be measured.
Objectives
- Explain the structure and function of the eye in focusing on near and distant objects, responding to changes in light intensity, and stereoscopic vision allowing better judgment of distance
- Understand eye defects and their treatment: long sight, short sight, astigmatism, cataracts, and the use of corneal transplants
- Explain the structure and function of the ear in balance and hearing
- Understand how prolonged exposure to high noise levels affects the functioning of the ear and hearing
- Investigate the range of frequency audible to the human ear
Lesson Note
Available on the Green Bridge App
Download the Green Bridge CBT app on your phone or computer to access full lesson notes, practice questions, and more.
Lesson Evaluation
Congratulations on completing the lesson on Sense Organs. Now that youve explored the key concepts and ideas, its time to put your knowledge to the test. This section offers a variety of practice questions designed to reinforce your understanding and help you gauge your grasp of the material.
You will encounter a mix of question types, including multiple-choice questions, short answer questions, and essay questions. Each question is thoughtfully crafted to assess different aspects of your knowledge and critical thinking skills.
Use this evaluation section as an opportunity to reinforce your understanding of the topic and to identify any areas where you may need additional study. Don't be discouraged by any challenges you encounter; instead, view them as opportunities for growth and improvement.
- When focusing on a distant object, what happens to the ciliary muscles and the lens? A) Ciliary muscles contract, lens becomes thicker B) Ciliary muscles relax, lens becomes thinner C) Ciliary muscles contract, lens becomes thinner D) Ciliary muscles relax, lens becomes thicker Answer: B
- Which eye defect is caused by an eyeball that is too long, so light from distant objects focuses in front of the retina? A) Long sight (hyperopia) B) Astigmatism C) Short sight (myopia) D) Cataracts Answer: C
- Which structure in the ear detects rotation of the head for balance? A) Cochlea B) Ossicles C) Eardrum D) Semicircular canals Answer: D
- The approximate range of frequency audible to a healthy young human ear is: A) 2 Hz to 2,000 Hz B) 20 Hz to 20,000 Hz C) 200 Hz to 200,000 Hz D) 2,000 Hz to 2,000,000 Hz Answer: B
- Cataracts are caused by: A) An eyeball that is too short B) An unevenly curved cornea C) A cloudy lens D) Damage to the cochlea Answer: C
Available on the Green Bridge App
Download the Green Bridge CBT app on your phone or computer to access full lesson notes, practice questions, and more.
Available on the Green Bridge App
Download the Green Bridge CBT app on your phone or computer to access full lesson notes, practice questions, and more.
Recommended Books
Practice Mock Questions
Want to practice mock questions on Sense Organs? Download the Green Bridge CBT app to access mock questions and full practice assessments for this topic.
Download The App On Google Playstore
Everything you need to excel in your exams
