Essentials of Healthier Living

accidents addiction adult alcohol American artery atherosclerosis behavior birth blood vessels bones brain called calories cancer cause cells chapter chemical chronic cold college students common common cold communicable diseases danger death diet drink drive drugs effects emotional endocrine endocrine system essential example exercise factors fatigue feelings female functions glands gonorrhea heart disease hormones hospital human body individual infant infection living male marriage mate ment mental health mental illness mentally retarded milk million muscles narcotic nerve nervous system Niacin normal nutrition occur organs ovum pain patient pattern person physical fitness physician pollution practice pregnancy present problems protein reactions romantic love sex organs sexual skin sleep smoking social sometimes sperm superego symptoms syphilis tablespoon tion tissue treatment uncon unconscious mind United usually uterus venereal disease vitamin weight woman women York young