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Search Results for “Sperm production (human)”
 
 
1) infertility. The Columbia Encyclopedia, Sixth Edition. 2001
...The term is usually limited to situations where the couple has had intercourse regularly for one year without using birth control. The term sterility is restricted...

2) fertility drug. The Columbia Encyclopedia, Sixth Edition. 2001
...Different methods are used to correct or circumvent the many different functional disorders of both males and females that can interfere with conception and childbearing...

3) reproductive system. The Columbia Encyclopedia, Sixth Edition. 2001
...Human FemaleIn the human female reproductive system, ova are produced in the ovaries, two small organs set in the pelvic cavity below and to either side of the navel....

4) endocrine system. The Columbia Encyclopedia, Sixth Edition. 2001
...The endocrine system includes the pituitary gland, thyroid gland, parathyroid glands, adrenal gland, pancreas, ovaries, and testes (see testis). The thymus gland,...

5) birth control. The Columbia Encyclopedia, Sixth Edition. 2001
...Methods of Birth ControlMale birth control methods include withdrawal of the male before ejaculation (the oldest contraceptive technique) and use of the condom, a...

6) ovum. The Columbia Encyclopedia, Sixth Edition. 2001
...The study of the ovum is included in the science of embryology. The development of a new individual from an unfertilized ovum is called parthenogenesis. 1In higher...

7) multiple birth. The Columbia Encyclopedia, Sixth Edition. 2001
...Although many smaller mammals bear several young at a time, multiple births are relatively uncommon in humans and other primates. Twinning, the process that leads...

8) ant. The Columbia Encyclopedia, Sixth Edition. 2001
...Formicidae of the order Hymenoptera, to which the bee and the wasp also belong. Like most members of the order, ants have a "wasp waist," that is, the front part...

9) menstruation. The Columbia Encyclopedia, Sixth Edition. 2001
...Menstruation commences at puberty (usually between age 10 and 17). The onset of menstruation, called menarche, signals the body's coming readiness for childbearing....

10) ivory. The Columbia Encyclopedia, Sixth Edition. 2001
...Ivory was obtained mainly from Africa, where elephant tusks are larger than they are in Asia, the second major source, and much dead ivory was taken from remains...

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