Object Lessons on the Human Body - BestLightNovel.com
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Where are the eyelids?--"Over the eyes."
Of what use are they?--"They cover the eyes and keep them from getting hurt."
Where are the eyelashes?--"On the edges of the eyelids."
Of what use are the tears?--"They keep the eyes clean; they make the eyes move easily in their sockets."
Where are the tears made?--"Back of the eyebrows."
When do the tears wash the eyes?--"Every time we wink our eyelids."
QUESTIONS ON THE EARS.
Name the parts of the ear.
Where are your ears?--"On the sides of my head."
Which is the rim of the ear?--"The edge of the ear."
Which is the flap of the ear?--"The lower part of the ear."
Where is the drum of the ear?--"Inside of the ear."
How is the drum protected?--"By stiff hairs and a bitter wax at its entrance."
QUESTIONS ON THE NOSE.
Where is the nose?--"In the middle of the face."
Name the parts of the nose.
Where is the tip of the nose?--"At the end of the nose."
Where is the bridge of the nose?--"At the top of the nose, between the eyes."
Where is the cartilage?--"In the middle of the inside of the nose."
Of what use is the nose?--"To smell and breathe through."
What are the nostrils?--"The openings inside of the nose."
Of what use are the nostrils?--"To let the air into and out of the opening back of the mouth."
QUESTIONS ON THE MOUTH, ETC.
Where is the mouth?--"In the lower part of the face, between the nose and the chin."
Of what use is the mouth?--"To breathe, speak, and eat through."
What is in the mouth?--"My tongue, my upper teeth, my lower teeth, and my upper and lower jaws."
What covers the jaws?--"Red flesh, called _gum_."
Of what are the jaws composed?--"Of bones."
Of what are the teeth made?--"Of dentine, covered with enamel." See note, p. 19.
What is enamel?--"A smooth, white substance, harder than bone."
Of what use are the teeth?--"To eat and talk with."
What kinds of teeth have you?--"Cutting teeth, tearing teeth, grinding teeth."
Describe the cutting teeth.--"The cutting teeth have broad and flat edges."
Describe the tearing teeth.--"The tearing teeth are sharp and pointed."
Describe the grinding teeth.--"The grinding teeth are the thick, back teeth."
Which jaw is moved in eating?--"The lower jaw."
What work do the teeth perform?--"They cut, tear, and grind the food."
How many teeth has a child in a full set?--"Twenty teeth: ten in each jaw."
How many teeth has a grown person in a full set?--"Thirty-two: sixteen in each jaw."
What does the tongue do in eating?--"It rolls the food between the teeth, and helps in swallowing."
What is the saliva?--"A kind of liquid, sometimes called _spit_."
Of what use is it in eating?--"It wets and softens the food."
What do you mean by preserve?--"To keep from injury."
What do you mean by injury?--"Hurt."
How do you preserve your teeth? See Formula.
How do very hot or very cold drinks hurt the teeth?--"They crack the enamel."
What happens if the enamel is cracked?--"The teeth decay."
