Testes hormones

1 An Introduction to the Human Body • Introduction • 1.1 Overview of Anatomy and Physiology • 1.2 Structural Organization of the Human Body • 1.3 Functions of Human Life • 1.4 Requirements for Human Life • 1.5 Homeostasis • 1.6 Anatomical Terminology • 1.7 Medical Imaging • Key Terms • Chapter Review • Interactive Link Questions • Review Questions • Critical Thinking Questions • 2 The Chemical Level of Organization • Introduction • 2.1 Elements and Atoms: The Building Blocks of Matter • 2.2 Chemical Bonds • 2.3 Chemical Reactions • 2.4 Inorganic Compounds Essential to Human Functioning • 2.5 Organic Compounds Essential to Human Functioning • Key Terms • Chapter Review • Interactive Link Questions • Review Questions • Critical Thinking Questions • 3 The Cellular Level of Organization • Introduction • 3.1 The Cell Membrane • 3.2 The Cytoplasm and Cellular Organelles • 3.3 The Nucleus and DNA Replication • 3.4 Protein Synthesis • 3.5 Cell Growth and Division • 3.6 Cellular Differentiation • Key Terms • Chapter Review • Interactive Link Questions • Review Questions • Critical Thinking Questions • 4 The Tissue Level of Organization • Introduction • 4.1 Types of Tissues • 4.2 Epithelial Tissue • 4.3 Connective Tissue Supports and Protects • 4.4 Muscle Tissue and Motion • 4.5 Nervous Tissue Mediates Perception and Response • 4.6 Tissue Injury and Aging • Key Terms • Chapter Review • Interactive Link Questions • Review Questions • Critical Thinking Questions • 5 The Integumentary ...

Coloured scanning electron micrograph of sperm cells that are developing inside a seminiferous tubule. The developing heads of the sperm cells are embedded in a layer of Sertoli cells (red) that nourish the developing sperm. Magnification: x3750 Where are the testes? The testes, also known as testicles or male The testes lie outside of the body and are maintained at a temperature about 2 oC lower than the body's core temperature. This is because sperm production and quality is optimal at this lower temperature. What do the testes do? The testes have two functions – to produce sperm and to produce hormones, particularly testosterone. Sperm are produced in the seminiferous tubules of the testes. There are about 700 of these tubes in each testis, each is the length of an arm and the width of a few hairs; the whole collection of tubules if laid end to end is longer than a football pitch! Once the sperm are produced in the seminiferous tubules, they pass into the epididymis (a long coiled tube in which sperm mature as they are conveyed along it). They are then ready to be released at ejaculation via the vas deferens. What hormones do the testes produce? The main hormone secreted by the testes is testosterone, an androgenic hormone. Testosterone is secreted by cells that lie between the seminiferous tubules, known as the Leydig cells. The testes also produce inhibin B and anti-Müllerian hormone from Sertoli cells, and insulin-like peptide 3 (INSL3) and oestradiol from the Leydig...

What is testosterone? Testosterone is a Your Testosterone is the main Is testosterone a steroid? Natural testosterone is a steroid — an anabolic-androgenic steroid. "Anabolic" refers to muscle building, and "androgenic" refers to increased male sex characteristics. However, when you hear people use the term “ Healthcare providers use synthetic testosterone to treat and manage various medical conditions. Synthetic testosterone is the main drug of Some athletes and bodybuilders misuse synthetic testosterone (anabolic steroids) by taking very high doses of them in an attempt to boost performance or change their physical appearance. Misuse of these drugs can cause several unpleasant symptoms and lead to long-term dangerous health problems, including blood clots, stroke, and potentially increase the risk of prostate cancer. What does testosterone do? Testosterone has different roles in different life stages, including: • • • Adulthood. Testosterone and fetal development At around week seven in utero, the sex-related gene on the Y chromosome initiates the development of the testicles in male infants. The testicles produce testosterone. Testosterone triggers the development of the male internal and external reproductive organs during fetal development. Testosterone and puberty Testosterone is responsible for many of the changes seen in children assigned male at birth during puberty, including: • An increase in height. • Body and pubic hair growth. • Enlargement of their • Increas...

Testosterone is a hormone, which is a substance in the body that acts as a chemical messenger. Hormones are made in one part of your body and then travel to other areas to help control how cells and organs work. Testosterone is important for your body to function properly. High or low testosterone levels can lead to unwelcome symptoms. Testosterone and estrogen are two of the most well-known hormones. Though testosterone is typically recognized as the “male hormone” and estrogen is often referred to as the “female hormone,” they’re both found in both men and women. Both men and women can experience health problems if their testosterone levels are out of the normal range. Researchers have identified about 50 different hormones in the human body, which control various processes, such as hunger, mood, sexual function, metabolism, growth, and menstrual cycles. Normal Testosterone Levels Under normal circumstances, testosterone performs many important functions in your body. Some risks and side effects of TRT include: • Possible risk for heart problems, cancer, and blood clots (though recent studies show that the risk for all of these is low or possibly not risky at all) • Infertility • Side effects such as breast enlargement (in males), skin reactions, changes in hair patterns, acne, and back pain Summary Testosterone is an important hormone for both men and women. If your testosterone levels are too low or high, you might develop symptoms that interfere with your daily life. ...

The following is an overview of the male reproductive anatomy: Scrotum. The bag of skin that holds and helps to protect the testicles. The testicles make sperm and, to do this, the temperature of the testicles needs to be cooler than the inside of the body. This is why the scrotum is located outside of the body. Click image to enlarge. Testes (testicles). The testes are 2 small organs that are found inside the scrotum. The testes are responsible for making sperm and are also involved in producing a hormone called testosterone. Testosterone is an important hormone during male development and maturation for developing muscles, deepening the voice, and growing body hair. Epididymis. A long tube that is located near each testicle. The epididymis is the tube which moves the sperm from the testicles. Vas deferens. This is a tube in which the sperm is stored and it carries the sperm out of the scrotal sac. The vas deferens is between the epididymis and the urethra and connects these together. Seminal vesicles. The sac-like glands that lie behind the bladder and release a fluid that forms part of semen. Prostate gland. It is about the size of a walnut, and surrounds the neck of the bladder and urethra—the tube that carries urine from the bladder. It is partly muscular and partly glandular with ducts opening into the prostatic portion of the urethra. It is made up of 3 lobes: a center lobe with 1 lobe on each side. The prostate gland secretes a slightly alkaline fluid that forms pa...

The endocrine system is a network of glands and organs located throughout the body. It’s similar to the However, while the nervous system uses nerve impulses and neurotransmitters for communication, the endocrine system uses chemical messengers called hormones. Keep reading to discover more about the endocrine system, what it does, and the hormones it produces. The endocrine system is responsible for regulating a range of bodily functions through the release of hormones. Hormones are secreted by the glands of the endocrine system, traveling through the bloodstream to various organs and tissues in the body. The hormones then tell these organs and tissues what to do or how to function. Some examples of bodily functions that are controlled by the endocrine system include: • metabolism • growth and development • sexual function and reproduction • heart rate • blood pressure • appetite • sleeping and waking cycles • body temperature What is a gland? A • endocrine glands, which release hormones directly into the bloodstream • exocrine glands, like lymph nodes and sweat glands, which are not part of the endocrine system The glands of the endocrine system are where hormones are produced, stored, and released. Each gland produces one or more hormones, which go on to target specific organs and tissues in the body. The glands of the endocrine system include the: • Hypothalamus. While some people don’t consider it a gland, the • Pituitary. The • Pineal. This • Thyroid. The • Parathyro...