Male reproduction

Male sex cells, or sperm, are produced in the testes. These are outside the body so that the sperm are kept cool. From the testes, sperm travel up a narrow tube, the vas deferens, in which they are joined by secretions from the seminal vesicles and the prostate gland to create semen. During sexual intercourse, semen is ejaculated into the vagina of the female. Erectile tissue in the penis expands as a result of increased blood flow during sexual arousal, allowing the insertion of the erect penis into the vagina during intercourse and the emission of semen. Once in the vagina, sperm "swim" by means of long, whiplike tails. Each sperm head contains genetic material.

FEMALE REPRODUCTION An egg shed by an ovary is swept up by the pronglike ends of the fallopian tube. A fertilized egg will pass down into the uterus and embed itself in the lining. The uterus expands greatly to accommodate a developing fetus.

Uterus

Follicle is cavity in which egg develops

Ovary

Fallopian tube

Fallopian tube

Uterus

LOCATION OF SYSTEM The female reproductive system lies inside the pelvic cavity, surrounded and protected by the pelvic bones. This space is wider than in the male to accommodate the enlarging uterus in pregnancy.

MALE REPRODUCTION During sexual intercourse sperm are propelled by means of muscle contractions from the testes along the vas deferens to the ejaculatory duct. At ejaculation, semen is propelled along the urethra and out of the penis.

Uterus

Follicle is cavity in which egg develops

FEMALE REPRODUCTION An egg shed by an ovary is swept up by the pronglike ends of the fallopian tube. A fertilized egg will pass down into the uterus and embed itself in the lining. The uterus expands greatly to accommodate a developing fetus.

Vagina

Cervix Ovary contains millions of follicles from birth

Vagina

Cervix Ovary contains millions of follicles from birth

Vas deferens

Bladder

Vas deferens

Bladder

Penis Scrotum

LOCATION OF SYSTEM The male reproductive organs are not within the pelvic cavity. In fact, they lie outside the body altogether—in the scrotum.

Bladder

Vas deferens

Bladder

Vas deferens

Urethra

Penis

Scrotum

Testis contains coiled tubes that produce thousands of sperm

Urethra

Penis

Scrotum

Penis Scrotum

LOCATION OF SYSTEM The male reproductive organs are not within the pelvic cavity. In fact, they lie outside the body altogether—in the scrotum.

Testis contains coiled tubes that produce thousands of sperm

Pregnancy And Childbirth

Pregnancy And Childbirth

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