CONTENTS XV 



Chapter 27 

 BLOOD AND CIRCULATION 537 



228. Blood Plasma 538 



229. Red Blood Cells 539 



230. Platelets and Blood Clotting 541 



231. White Blood Cells 542 



232. Immunity 542 



233. Blood Groups 544 



234. The Rh Factor 545 



235. Patterns of Circulation 545 



236. The Fetal Circulation 549 



237. Flow of Blood and Lymph 551 



Chapter 28 



THE UROGENITAL SYSTEM-EXCRETION AND 



REPRODUCTION 559 



238. Evolution of the Kidneys and Their Ducts 559 



239. The Nephron and Its Function 562 



240. The Gonads 566 



241. Reproductive Passages 568 



242. Mammalian Reproduction 571 



Chapter 29 

 SENSE ORGANS AND NERVOUS COORDINATION 574 



243. The Eye 576 



244. The Lateral Line and Ear 581 



245. Organization of the Nervous System 585 



246. Peripheral Nervous System 591 



247. Central Nervous System 596 



Chapter 30 

 THE ENDOCRINE SYSTEM 605 



248. Methods of Investigating Endocrines 606 



249. The Thyroid 608 



250. The Parathyroid Glands 614 



251. The Islet Cells of the Pancreas 615 



252. The Adrenal Glands 616 



253. The Pituitary Gland 620 



254. The Testis 627 



255. The Ovaries 628 



256. Estrous and Menstrual Cycles 631 



257. The Hormones of Pregnancy 633 



