The Major Function Of The Reproductive System

4271 words - 18 pages

The major function of the reproductive system is to ensure survival of the species. Other systems in the body, such as the endocrine and urinary systems, work continuously to maintain homeostasis for survival of the individual. An individual may live a long, healthy, and happy life without producing offspring, but if the species is to continue, at least some individuals must produce offspring.
Within the context of producing offspring, the reproductive system has four functions: | |To produce egg and sperm cells
o To transport and sustain these cells
o To nurture the developing offspring
o To produce hormones
These functions are divided between the primary ...view middle of the document...

The male gonads, testes, or testicles, begin their development high in the abdominal cavity, near the kidneys. During the last two months before birth, or shortly after birth, they descend through the inguinal canal into the scrotum, a pouch that extends below the abdomen, posterior to the penis. Although this location of the testes, outside the abdominal cavity, may seem to make them vulnerable to injury, it provides a temperature about 3° C below normal body temperature. This lower temperature is necessary for the production of viable sperm.The scrotum consists of skin and subcutaneous tissue. A vertical septum, or partition, of subcutaneous tissue in the center
divides it into two parts, each containing one testis. Smooth muscle fibers, called the dartos muscle, in the subcutaneous tissue contract to give the scrotum its wrinkled appearance. When these fibers are relaxed, the scrotum is smooth. Another muscle, the cremaster muscle, consists of skeletal muscle fibers and controls the position of the scrotum and testes. When it is cold or a man is sexually aroused, this muscle contracts to pull the testes closer to the body for warmth.

Structure

Each testis is an oval structure about 5 cm long and 3 cm in diameter. A tough, white fibrous connective tissue capsule, the tunica albuginea, surrounds each testis and extends inward to form septa that partition the organ into lobules. There are about 250 lobules in each testis. Each lobule contains 1 to 4 highly coiled seminiferous tubules that converge to form a single straight tubule, which leads into the rete testis. Short efferent ducts exit the testes. Interstitial cells (cells of Leydig), which produce male sex hormones, are located between the seminiferous tubules within a lobule.

Spermatogenesis

Sperm are produced by spermatogenesis within the seminiferous tubules. A transverse section of a seminiferous tubule shows that it is packed with cells in various stages of development. Interspersed with these cells, there are large cells that extend from the periphery of the tubule to the lumen. These large cells are the supporting, or sustentacular cells (Sertoli's cells), which support and nourish the other cells.
Early in embryonic development, primordial germ cells enter the testes and differentiate into spermatogonia, immature cells that remain dormant until puberty. Spermatogonia are diploid cells, each with 46 chromosomes (23 pairs) located around the periphery of the seminiferous tubules. At puberty, hormones stimulate these cells to begin dividing by mitosis. Some of the daughter cells produced by mitosis remain at the periphery as spermatogonia. Others are pushed toward the lumen, undergo some changes, and become primary spermatocytes. Because they are produced by mitosis, primary spermatocytes, like spermatogonia, are diploid and have 46 chromosomes.
Each primary spermatocytes goes through the first meiotic division, meiosis I, to produce two secondary spermatocytes, each...

Other Essays Like The major function of the reproductive system

The Function Of Profanity In Modern English

4019 words - 17 pages Table Of Contents .Chapter 1- Introduction and ClarificationChapter 2- Everyday Usage of ProfanityChapter 3- How Profanity OffendsChapter 4- A Look at the Literal Meanings and TabooChapter 5- Phatic and Emotive LanguageChapter 6- The Employment of SubstitutesChapter 7- A Brief Historical PerspectiveChapter 8- The Use of Profanity in the MediaChapter 9- ConclusionsBibliographyThe Function of Profanity in Modern EnglishChapter 1- Introduction and

The Purpose and Function of Lumbar Brace

875 words - 4 pages Evolution and the Function of a Lumbosacral brace. Lumbosacral belts are back braces that help treat pain in the lumbar spine and sacrum. There are many spinal braces for different parts of a person’s spine which doctors may call orthotics or orthoses. Lumbosacral belts are designed to provide pressure on the patient’s abdominals, thereby giving the patient lower back support. The Lumbosacral belt is also used to reduce weight and stress on the

Using Material from Item a and Elsewhere, Assess the View That the Main Function of the Education System Is to Reproduce and Legitimise Social Inequalities

2354 words - 10 pages 4) Education is an aspect of socialisation which involves the acquisition of knowledge and learning of skills. It shapes our beliefs and moral values through a systematic formal transmission. Education is said to be an integral function of society, as it provides a contributory characteristic which helps to maintain and adapt society and it’s values Before the 1960’s, education was taught through a system known as the ‘Tripartite’ system

The Major Causes Of The Great Depression

855 words - 4 pages of Europe have been apprehensive of the cocoon spun by America's commerce isolation. One of the major causes of the Depression was the isolation of America's economy from international trade. This key factor can be sorted into two separate causes, the lack of an open market and the inability to maintain a stable currency rate. Another major cause was the continuation of debts, loans, and reparations. These three factors are all connected with

Major Themes In The Theory Of Evolution

2629 words - 11 pages Major Themes in the Theory of Evolution The world around us changes. This simple fact is obvious everywhere we look. Streams wash dirt and stones from higher places to lower places. Untended gardens fill with weeds. Other changes are more gradual but much more dramatic when viewed over long time scales. Powerful telescopes reveal new stars coalescing from galactic dust, just as our sun did more than 4.5 billion years ago. The earth

The Function and Roles of Health Care Management

1054 words - 5 pages roles a health care manager has we can move on to the four major functions and how they apply to management positions. FOUR MAJOR FUNCTIONS OF MANAGEMENT In the medical field a health care manager must recognize performance problems and opportunities, make good decisions, and also take appropriate action every day. They can accomplish this through a process called management (Lombardi, Schermerhorn, & Kramer, 2007,). This process has four

The Business Report of the Australian Major Footwear Retailer-Ugg

2705 words - 11 pages The Australian UGG Company Major Assignment The business report of the Australian major footwear retailer-UGG Name: Youyou Lu(21968780) Tutor: Manessoonthorn Chadinee Tutorial time: Friday, 11:30 am-2:30 pm Course name: MCD2050 Marketing 1 Due Date: 14/12/2009 Table of content 1.0. Executive summary 4 2.0. Introduction 5 2.1. Background of UGG Company 5 2.2. Assumptions and limitations 5 3.0. Overview of

Departure of the Court System

1779 words - 8 pages Criminal Justice Administration MET CJ 831 Assignment 3 02-09-2015 Our judicial system has been around to dissolve disputes since our founding fathers. The adversarial system is the foundation of our court system as we know it today. But because our nation has changed immensely since our founding fathers, the judicial system has been forced to change in order to be accommodating. It hasn’t been replaced over

Characteristics of the Market System

808 words - 4 pages Essay 4 List 9 Characteristics of the market system In a market system economy, decision making is widely dispersed. Capitalism by design, fuels itself. There are 9 key features which act simultaneously to enable the continued renewal of the market system. Through private property individuals and businesses are able to obtain, use and dispose of property resources as they see fit. It is the right to private property which allows one to

Conduction System of the Heart

741 words - 3 pages The Normal Conduction system of the heart A Labelled P QRS and T wave seen on a single Lead ECG complex. | What is the heart rate in sinus rhythm? Normal sinus rhythm is the rate of around 60 – 100 beats per minute (bpm) What is the definition of sinus tachycardia? Sinus tachycardia is the rhythm with an elevated amount of impulse which is greater than 100bpm. What is the definition of sinus bradycardia? This is a rate

The Function Of General Management Differs From The Other Organisational Functions In That It Is The Function That Integrates All The Others

1641 words - 7 pages basis, to provide a specific interpretation of the company's relative position to present to any outsiders, be they shareholders, future investors, the market as a whole, etc.There are of course many other function areas within a business. Examples may include distribution departments, customer relations departments, as well as several others.The links between all of these areas is in some cases fairly obvious. The marketing department for instance

Related Papers

Anatomy Of The Female Reproductive System

614 words - 3 pages ANATOMY OF THE FEMALE REPRODUCTIVE SYSTEM The female reproductive system consists of external and internal structures. Other anatomic structures that affect the female re- productive system include the hypothalamus and pituitary gland of the endocrine system. 
External Genitalia 
The external genitalia (the vulva) include two thick folds of tissue called the labia majora and two smaller lips of delicate tissue called the labia minora

Major Ccomponents Of The U.S. Healthcare System

1110 words - 5 pages Angelic R. Huckaby Module 1 Case MHA 507 Dr. Thomas Esch January 22, 2013 The discussion that will take place within this paper will cover the interaction of the major components of the U.S. healthcare system on (1) Access to Healthcare (physically and financially), (2) Healthcare Expenditure, and (3) Quality of Care. From my standpoint healthcare is killing American business. Healthcare costs have hit many businesses really hard. “The

The Function Of Our Memory Essay

919 words - 4 pages rarely, if ever, had to call home from an area outside of the calling area. Thus, I did not apply to my long-term memory the application of rehearsal. This leads us to another topic under the discussion of memory, memory modules. With this research it is believed that each component represents a separate memory system in the brain. To better understand this philosophy, I once again would like to use a personal experience. First, however, let’s

Asses The View That The Main Function Of The Education System Is To Reproduce And Legitimise Social Inequalities

752 words - 4 pages Asses the view that the main function of the education system is to reproduce and legitimise social inequalities. Functionalist writers such as Parsons have suggested that social inequality in contemporary societies is based on the principal of meritocracy and equality of opportunity. In meritocracy, social inequality is based on the different abilities, talents and skills individuals have. For most people today, their abilities and talents