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Content: 5–8 weeks The fetus is about 1 inch long at 8 weeks. The mouth, nostrils, eyelids, hands, fingers, feet, and toes begin to form. The nervous system can respond to stimuli. The cardiovascular system is fully functional. 9–14 weeks The fetus develops a human profile. Sex organs, eyelids, fingernails, and toenails develop. By week 12 the fetus makes crying motions but no sound and may suck its thumb. HS_HEALTH_U06_C19_L1 12/17/02 2:57 PM Page 488
Lesson 1 The Beginning of the Life Cycle489
During the period of growth in the uterus, the fetus develops in preparation for living outside the mother’s body. Organs develop and become ready to function on their own. The fetus grows and gains weight.