Sperm Maturation Spermatozoa leave each testis through small tubes called efferent ductules. Fluid pressure from secretions in the testis and ciliated cells in the efferent ductules help move spermatozoa into the epididymis.

Why Some Babies with Male Genes Have Female Parts To their own horror and that of their parents, some babies born with male genes end up with female parts.

Organisms of many species are specialized into male and female varieties, each known as a sex. Sexual reproduction involves the combining and mixing of genetic traits: specialized cells known as gametes combine to form …

The testes (singular: testis), commonly known as the testicles, are a pair of ovoid glandular organs that are central to the function of the male reproductive system.

Scientists have created a new male contraceptive that makes sperm unable to swim.

Bullet 18 of 31 Straw Purchases. When a gun buyer gets somebody else to fill out his or her paperwork, that’s called a “straw purchase.” This can put guns in the hands of people who are legally prohibited from owning them.

Apr 07, 2009 · Story Highlights; Phillip Alpert, now a registered sex offender, sent pictures of his 16-year-old teenfriend; Marissa Miller was 12 when she took cell phone photos of herself in a bra

A male organism is the physiological sex that produces sperm.Each spermaton can fuse with a larger female gamete, or ovum, in the process of fertilization.A male cannot reproduce sexually without access to at least one ovum from a female, but some organisms can reproduce both sexually and asexually.

Biology4s.com! This tutorial introduces cell structure. Other sections include plants, systems, invertebrates, vertebrates, and microorganisms.

A person’s sex is either male or female.For example: John’s sex is male.Jane’s sex is female.This difference is sometimes called gender.. In humans, the sex of a person depends on what sex chromosomes that person got from his or her parents.