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" If the air waves are small, the sound will be famt in your ears. The function of the ear. The ear collects the sound waves and makes them strike on the ends of the nerves of hearing. This causes the nerves of hearing to carry messages to the brain, and... "
Primer of Hygiene: Being a Simple Textbook on Personal Health and how to Keep it - Trang 122
bởi John Woodside Ritchie, Joseph Stuart Caldwell - 1917 - 184 trang
Xem Toàn bộ - Giới thiệu về cuốn sách này

Primer of Hygiene

John Woodside Ritchie, Joseph Stuart Caldwell - 1910 - 200 trang
...the air waves are large, the sound will be loud. If the air waves are small, the sound will be famt in your ears. The function of the ear. The ear collects...down into the head. At the bottom of this canal is a little skin-like membrane called the tympanic membrane. This separates the outer and the middle ear....

The Building and Care of the Body: An Elementary Text-book in Practical ...

Columbus Norman Millard - 1910 - 264 trang
...protection, we need first to learn some facts about the structure and working of these important organs. Structure of the Ear. — The ear has three divisions,...outer, the middle, and the inner ear. The outer ear is the little flap of cartilage and skin called the auricle, which we can see and feel, and the small...

Personal hygiene and home nursing

Louisa Christiana Lippitt - 1918 - 294 trang
...and it needs much more careful attention than it usually receives. It is divided into three parts, the outer , the middle, and the inner ear. The outer ear is composed of the auricle, or what we commonly call the ear, and a tube or canal leading into the middle...

New Primer of Hygiene: A Simple Textbook on Personal Health and how to Keep it

John Woodside Ritchie, Joseph Stuart Caldwell - 1919 - 170 trang
...possible. THE EARS AND THEIR CARE WHEN you throw a stone into water, the stone causes waves to run out into the water. When you ring a bell, the bell causes waves...membrane. This separates the outer and the middle ear. 133 The middle ear is a little cavity in the bone of the skull. It is filled with air, and from it...

A New Course of Plants and Animals

240 trang
...Surplus tears pass down a tube into the nose. The ears Hearing. Each EAR consists of three parts : the OUTER, the MIDDLE, and the INNER ear. The OUTER EAR is the part which projects from the head and helps to 'catch' the sound. Have you noticed a cat or a dog...
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Modern Science Book IV

270 trang
...already been described in the chapter on LIGHT (see P- 74). HEARING. The EAR consists of three parts: the OUTER, the MIDDLE, and the INNER ear. The OUTER EAR is the part which projects from the head and helps to 'catch' the sound. Have you noticed a Cat or a Dog...
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