The anglerfish are fish of the teleost order Lophiiformes (/ ˌ l ɒ f i ɪ ˈ f ɔːr m iː z /). They are bony fish named for their characteristic mode of predation, in which a modified luminescent fin ray (the esca or illicium) acts as a lure for other fish. The luminescence comes from symbiotic bacteria, which are thought to be acquired from seawater, that dwell in and around the sea.

A testicle or testis (plural testes) is the male reproductive gland or gonad in all bilaterians, including humans.It is homologous to the female ovary.The functions of the testes are to produce both sperm and androgens, primarily testosterone.Testosterone release is controlled by the anterior pituitary luteinizing hormone, whereas sperm production is controlled both by the …

Cell cycle. There is significant overlap in function with regards to some of these proteins. In particular, the Rho-related genes are important in nuclear trafficking (i.e.: mitosis) as well as with mobility along the cytoskeleton in general. ... Sperm/Testis. Although this page is devoted to genes that should be ubiquitously expressed, this ...

The XY sex-determination system is a sex-determination system used to classify many mammals, including humans, some insects (), some snakes, some fish (), and some plants (Ginkgo tree). In this system, the sex of an individual is determined by a pair of sex chromosomes.Females have two of the same kind of sex chromosome (XX), and are called the …

The epididymis (/ ɛ p ɪ ˈ d ɪ d ɪ m ɪ s /; plural: epididymides / ɛ p ɪ d ɪ ˈ d ɪ m ə d iː z / or / ɛ p ɪ ˈ d ɪ d ə m ɪ d iː z /) is a tube that connects a testicle to a vas deferens in the male reproductive system.It is a single, narrow, tightly-coiled tube in adult humans, 6 to 7 meters (20 to 23 ft) in length. It serves as an interconnection between the multiple efferent ...

A queen bee is typically an adult, mated female that lives in a colony or hive of honey bees.With fully developed reproductive organs, the queen is usually the mother of most, if not all, of the bees in the beehive. Queens are developed from larvae selected by worker bees and specially fed in order to become sexually mature. There is normally only one adult, mated queen in a hive, in …

Semen cryopreservation (commonly called sperm banking or sperm freezing) is a procedure to preserve sperm cells.Semen can be used successfully indefinitely [citation needed] after cryopreservation.It can be used for sperm donation where the recipient wants the treatment in a different time or place, or as a means of preserving fertility for men undergoing vasectomy or …

Deoxyribonucleic acid (/ d iː ˈ ɒ k s ɪ ˌ r aɪ b oʊ nj uː ˌ k l iː ɪ k,-ˌ k l eɪ-/ (); DNA) is a polymer composed of two polynucleotide chains that coil around each other to form a double helix.The polymer carries genetic instructions for the development, functioning, growth and reproduction of all known organisms and many viruses.DNA and ribonucleic acid (RNA) are nucleic acids.

Aug 01, 2004 · Abstract. BACKGROUND: Declining fertility of couples from the fourth decade of life is largely attributable to the drop in female fertility. However, increasing numbers of men, whose fertility theoretically lasts until death, are seeking fertility treatment at older ages, yet there is little information on sperm production and function past the age of 50 years.

pH. The lungs and kidneys are the main regulators of an organism's acid / alkali balance. The balance is maintained through the controlled excretion of acidic hydrogens in the form of ammonia ions, monohydrogenated phosphate, weak organic acids and through the reabsorption of bicarbonate through glomerular filtration in the convoluted tubules of the nephron.

The uterus has three layers, which together form the uterine wall.From innermost to outermost, these layers are the endometrium, myometrium, and perimetrium.. The endometrium is the inner epithelial layer, along with its mucous membrane, of the mammalian uterus. It has a basal layer and a functional layer; the functional layer thickens and then is shed during the menstrual cycle …

A mitochondrion (/ ˌ m aɪ t ə ˈ k ɒ n d r i ə n /; pl. mitochondria) is an organelle found in the cells of most Eukaryotes, such as animals, plants and fungi.Mitochondria have a double membrane structure and use aerobic respiration to generate adenosine triphosphate (ATP), which is used throughout the cell as a source of chemical energy. They were discovered by Albert von …

Kleptoparasitism (etymologically, parasitism by theft) is a form of feeding in which one animal deliberately takes food from another. The strategy is evolutionarily stable when stealing is less costly than direct feeding, which can mean when food is scarce or when victims are abundant. Many kleptoparasites are arthropods, especially bees and wasps, but including some true flies, …

In biology, cell theory is a scientific theory first formulated in the mid-nineteenth century, that living organisms are made up of cells, that they are the basic structural/organizational unit of all organisms, and that all cells come from pre-existing cells.Cells are the basic unit of structure in all organisms and also the basic unit of reproduction.