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LD BIO CH 23
LD BIO CH 23 HUMAN REPRODUCTION
| Term | Definition |
|---|---|
| TESTES | the male gonads, which produce sperm and secrete male sex hormones |
| SECONDARY SEX CHARACTERISTICS | characteristics - such as body, hair, muscle development, broadened pelvis, or voice depth - controlled by the male and female sex hormones, but not essential to the reproductive process |
| SCROTUM | a sac of skin outside the body wall in which the testes are located |
| EPIDIDYMIS | a storage area for sperm on the upper, rear part of the testes |
| VAS DEFERENS | the tubes that carry sperm from each testis to the urethra |
| URETHRA | the tube that carries urine from the bladder to the outside of the body. |
| SEMEN | the mixture of sperm and fluids released during ejaculation |
| EJACULATION | a process by which involuntary muscular contractions force the semen through the uretha and out of the body. |
| OVARIES | the female gonad, which produces egg cells |
| FOLLICLES | the structures in the ovaries in which the mature eggs develop |
| OVULATION | the release of an egg from an ovary |
| OVIDUCT | a tube that carries the egg away from the ovary |
| UTERUS | the thick, muscular, pear-shaped organ in the female mammal in which the embryo develops |
| CERVIX | the narrow neck of the uterus |
| VAGINA | the structure leading from the uterus to the outside of the body in mammalian females; the birth canal |
| MENSTRUAL CYCLE | the hormone-controlled cycle in the human female, lasting about a month, in which an egg matures and is released from the ovary and the uterus prepares to receive it. |
| CORPUS LUTEUM | a progesterone-secreting yellow body in the ovary, formed when luteinizing hormone causes a ruptured follicle to fill with cells. |
| MENSTRUATION | the last stage of the menstrual cycle, marked by the shedding of some of the uterine lining, the unfertilized egg, and as small amount of blood through the vagina, which occurs about once a month in the human female. |
| IN VIRTO FERTILIZATION | the process of fertilization in a class laboratory dish |
| IMPLANTATION | the fastening of the embryo to the wall of the uterus |
| PREGNANCY | the period during which the developing embryo is carried in the uterus |
| FETUS | the developing baby after about the second month of the pregnancy |
| CHORION | the membrane that surrounds the embryo and the other extra embryonic membranes in mammals, birds and reptiles |
| PLACENTA | a temporary organ through which the fetus receives food and oxygen from the mother's body and gets rid of wastes. |
| UMBILICAL CORD | the structure that connects the fetus and the placenta |
| AMNIOTIC FLUID | the fluid that fills the amnion |
| GESTATION | the length of the pregnancy |
| LABOR | the slow, rhythmic contractions of the uterine muscles during childbirth. |
| FRATERNAL TWINS | two individuals formed when two eggs are fertilized at the same time; twins that are genetically different |
| IDENTICAL TWINS | two individuals formed when one fertilized eggs divides at an early stage of development, producing two organisms with the same genetic makeup |
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desilva13
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