CONTENTS XV 



CHAPTER X 

 A STUDY OP THE MUSCLES 



PAGE 



Importance of Muscle Tissue Kinds of Muscle . . . 193 



1. THE VOLUNTARY MUSCLES : The Biceps Muscle The Tri- 



ceps Muscle Arrangement of Muscles in the Body 

 Structure of Voluntary Muscle Blood Supply of Muscles 

 Nerve Supply to Muscles Standing Walking 

 Running 194 



2. INVOLUNTARY MUSCLE: Nerve Control Functions Struc- 



ture of Involuntary Muscle Heart Muscle . . . 201 



3. THE HYGIENE OF MUSCLE : Necessary Conditions for Healthy 



Muscles Food Fresh Air Exercise Rest. . . 202 



4. A CoaiPARATivE STUDY OF LOCOMOTION : Amoeba Para- 



mecium Earthworm Locomotion in Water Locomo- 

 tion in the Air Locomotion on Land . . . 205 



CHAPTER XI 

 A STUDY OF RESPIRATION 



1. NECESSITY FOR RESPIRATION: Definitions Necessity for In- 



spiration Necessity for Expiration Wastes given off by 



the Lungs , 209 



2. THE ORGANS OF RESPIRATION : Course taken by the Air 



The Nose Cavity The Throat and Larynx The Wind- 

 pipe* and its Branches The Lungs Blood Supply The 

 Pleura The Structure of the Chest Cavity Enlargement 

 of the Chest Cavity Movements of the Ribs Structure 

 and Movements of the Diaphragm How the Lungs are 

 filled with Air Inspiration and Expiration . . . 210 



3. CHANGES IN AIR AND BLOOD DUE TO RESPIRATION: Tem- 



perature of Inspired and of Expired Air Composition of 

 Inspired and of Expired Air Changes in the Blood while 

 passing through the Lungs 221 



4. HYGIENE OF THE RESPIRATORY ORGANS : Hygienic Habits 



of Breathing Effect of Exercise on Respiration Effect 

 of Tight Clothing upon Respiration Diseases of the 

 Respiratory Organs Coughing, Sneezing, Choking Suf- 

 focation Necessity of Ventilation Methods of Ventila- 

 tion Proper Methods of Sweeping and Dusting . . 222 



