33 results found

Search Results for: testosterone

Testosterone

Definition noun, plural: testosterones A steroid hormone with a chemical formula of C19H28O2, and is regarded as the primary... Read More

Human Reproduction

Terminology and Concepts Primary reproductive organs are called gonads - testes in the male and ovaries in the female.... Read More

Spermatogenesis

Spermatogenesis Definition Spermatogenesis is the biological process of producing sperm cells. It occurs in the male gonad... Read More

Steroidogenesis

Definition noun, plural: steroidogeneses The biosynthesis of steroid hormones from cholesterol by various cells, such as... Read More

Principles of Hormonal Control Systems

Hormones are chemical messengers that enter the blood directly upon their secretion from endocrine glands. A single gland or... Read More

Androsterone

Definition noun, plural: androsterones A steroid hormone, with a chemical formula of C19H30O2, has masculinizing effects,... Read More

Leydig cell

Leydig cell interstitial cells of the mammalian testis, involved in synthesis of testosterone. leydig cell Leydig cells,... Read More

Hypertrophy

Hypertrophy Definition Hypertrophy refers to the enlargement or increase in the size of an organ or tissue due to the... Read More

Physical Development in Humans

The Newly Born Child Depending on the nutrients available to the child within pregnancy and the genetic makeup of the... Read More

Estrogen

Definition noun, plural: estrogens A sex steroid hormone produced in large quantities chiefly in the ovaries in females;... Read More

Spermiogenesis

Spermiogenesis Definition Spermiogenesis is the stage of spermatogenesis wherein the spermatids differentiate into mature... Read More

Animal Growth Hormones

Reviewed by: Mary Anne Clark, Ph.D. As mentioned in the previous tutorial, hormones are produced in... Read More

Reproductive system

What is the Reproductive System? The reproductive system of an organism is the biological system made up of all the... Read More

Anabolism

Anabolism Definition Metabolic processes involve the conversion of one molecule into another through a sequence of chemical... Read More

Progesterone

Definition noun, plural: progesterones A progestogen hormone, with a chemical formula of C21H30O2, naturally produced in... Read More

Y chromosome

Y chromosome Definition The Y chromosome constitutes one member of the pair of sex chromosomes within an organism, a common... Read More

Luteinizing hormone

Definition noun, plural: luteinizing hormones A gonadotropin released by the gonadotropes of the anterior pituitary, and,... Read More

Follicle-stimulating hormone

Follicle Stimulating Hormone Definition In the pituitary gland of the brain, gonadotropic hormones are released.... Read More

Hormone Production

Reviewed by: Mary Anne Clark, Ph.D. Hormones are chemical messengers produced by glands in the endocrine system.... Read More

Adipose tissue

Adipose Tissue Definition Adipose tissue, a specialized variety of connective tissue, is composed of lipid-rich cells known... Read More

Regulation of Organic Metabolism, Growth and Energy Balance

Organic Metabolism Events of Absorptive and Post-absorptive States. The absorptive state is the period during which... Read More

Chemical Composition of the Body

In order to fully understand the mechanisms of human physiology, it is important to have an understanding of the chemical... Read More

Anabolic steroid

Definition noun, plural: anabolic steroids Any of the synthetic steroid hormones (androgens) that promote muscle and bone... Read More

Endocytosis

Endocytosis Definition What is endocytosis in biology? Endocytosis is a cellular process by which a cell internalizes any... Read More

Catabolism

Catabolism Definition Catabolism is the branch of the metabolic process that breaks down complex, big molecules into... Read More

Klinefelter syndrome

Definition noun A genetic condition in a male characterized by the presence of at least one extra X chromosome Supplement In... Read More

Sex hormone

Definition noun A hormone that is secreted by gonads and is involved in the regulation of sexual functions, such as the... Read More

Lipolysis

Definition noun The process of breaking down of lipids (fats) into fatty acids and glycerol Supplement Lipolysis is the... Read More

Sex steroid

Definition noun, plural: sex steroids A steroid hormone that when bound to specific sex hormone receptor becomes active and... Read More

Sertoli cell

Definition noun, plural: Sertoli cells Any of the elongated cells located in the seminiferous tubules of the testis, and... Read More

Parasitism

Organisms depend on different sources of food to survive. Larger organisms like plants make their own food (autotrophs) and... Read More

Gonadotropin

Definition noun, plural: gonadotropins A polypeptide hormone secreted by the anterior pituitary and the placenta, and acts... Read More

Seminiferous tubule

Definition noun, plural: seminiferous tubules Any of the tubules in the testes through which spermatozoa are produced and... Read More