ANATOMY AND PHYSIOLOGY
EYE.
What is a skin eye? 643.
What are the three coats of the eyehall? 643.
What is the vitreous humor? 643-4.
The aqueous humor? 644.
What is the pupil? 644.
What makes it vary in size? 644.
What is the structure of the retina? 644.
What is the yellow spot of the eye? 644.
What is the optic nerve? 644.
What is the blind spot? 644.
Does the eye itself do the seeing? 644.
When is a person short-sighted? 644.
When is a person long-sighted? 644.
How is the eye accommodated for a different focus? 644.
EAR.
What is the ear? 572.
In the simpler forms of life, how is the ear constructed? 572. How does the ear start in all vertebral animals? 572. What is the outer ear? 572. What separates it from the middle ear? 572. What are the three bones of the middle ear? 572. What is the eustachian tube? 572. How does the middle ear in birds and reptiles differ from that in the
higher animals? 572.
What are the parts of the inner ear? 572. What are the organs of Corti? 573.
NOSE.
Can some animals smell, though they have no nose? 1362. What sort of an organ is the nose? 1362.
TONGUE.
What is the tongue? 1922.
What is the bridle of the tongue? 1922.
What parts of the tongue are most sensitive to taste? 1873.
What must be done to a substance before it can be tasted? 1873.
What substances are easily tasted even when greatly diluted? 1874.
What are the two sets of muscles governing the tongue? 1922.
BRAIN.
Why is the brain the most interesting organ of the body? 257.
What is the central nervous system? 257.
What is the general nature of the changes from the brains of the simpler to those of the higher animals? 257-8.
Of what does the gray matter of the cortex consist? 258.
How is the cortex connected with other parts of the brain? 258.
What are the various kinds of fibers? 258.
What is the relation between certain groups of nerve cells and particular activities of the body? 258.
Why is any injury to the medulla oblongata very serious? 258.
LUNGS.
What are the two kinds of respiratory organs? 1603.
What is the essence of respiration? 1603.
Is it of the same nature in all animals and in plants? 1603.
In what plane of animal life do lungs first appear instead of gills? 1603.
What is the structure of the lungs in man? 1603.
What are the bronchial tubes? 1603.
What exchanges take place in the capillaries? 1603, 229.
What two kinds of respiration take place in the lungs? 1603.
HEART.
What is the function of the heart? 853.
Is it present in both vertebrate and invertebrate animals? 853.
2305
