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By the end of this section, you will be able to:
  • Describe human male and female reproductive anatomies
  • Discuss the human sexual response
  • Describe spermatogenesis and oogenesis and discuss their differences and similarities

As animals became more complex, specific organs and organ systems developed to support specific functions for the organism. The reproductive structures that evolved in land animals allow males and females to mate, fertilize internally, and support the growth and development of offspring.

Human reproductive anatomy

The reproductive tissues of male and female humans develop similarly in utero until a low level of the hormone testosterone is released from male gonads. Testosterone causes the undeveloped tissues to differentiate into male sexual organs. When testosterone is absent, the tissues develop into female sexual tissues. Primitive gonads become testes or ovaries. Tissues that produce a penis in males produce a clitoris in females. The tissue that will become the scrotum in a male becomes the labia in a female; that is, they are homologous structures.

Male reproductive anatomy

In the male reproductive system, the scrotum    houses the testicles or testes (singular: testis), including providing passage for blood vessels, nerves, and muscles related to testicular function. The testes    are a pair of male reproductive organs that produce sperm and some reproductive hormones. Each testis is approximately 2.5 by 3.8 cm (1.5 by 1 in) in size and divided into wedge-shaped lobules by connective tissue called septa. Coiled in each wedge are seminiferous tubules that produce sperm.

Sperm are immobile at body temperature; therefore, the scrotum and penis are external to the body, as illustrated in [link] so that a proper temperature is maintained for motility. In land mammals, the pair of testes must be suspended outside the body at about 2 ° C lower than body temperature to produce viable sperm. Infertility can occur in land mammals when the testes do not descend through the abdominal cavity during fetal development.

Art connection

Illustration shows a cross section of the penis and testes. The penis widens at the end, into the glans, which is surrounded by the foreskin. The urethra is an opening that runs through the middle of the penis to the bladder. The tissue surrounding the urethra is the Corpus spongiosum, and above the Corpus spongiosum is the Corpus cavernosum. The testes, located immediately behind the penis, are covered by the scrotum. Seminiferous tubules are located in the testes. The epididymis partly surrounds the sac containing the seminiferous tubules. The Vas deferens is a tube connecting the seminiferous tubules to the ejaculatory duct, which begins in the prostate gland. The prostate gland is located behind and below the bladder. The seminal vesicle, located above the prostate, also connects to the seminal vesicle. The bulbourethral gland connects to the ejaculatory duct where the ejaculatory duct enters the penis.
The reproductive structures of the human male are shown.

Which of the following statements about the male reproductive system is false?

  1. The vas deferens carries sperm from the testes to the penis.
  2. Sperm mature in seminiferous tubules in the testes.
  3. Both the prostate and the bulbourethral glands produce components of the semen.
  4. The prostate gland is located in the testes.

Sperm mature in seminiferous tubules that are coiled inside the testes, as illustrated in [link] . The walls of the seminiferous tubules are made up of the developing sperm cells, with the least developed sperm at the periphery of the tubule and the fully developed sperm in the lumen. The sperm cells are mixed with “nursemaid” cells called Sertoli cells which protect the germ cells and promote their development. Other cells mixed in the wall of the tubules are the interstitial cells of Leydig. These cells produce high levels of testosterone once the male reaches adolescence.

When the sperm have developed flagella and are nearly mature, they leave the testicles and enter the epididymis, shown in [link] . This structure resembles a comma and lies along the top and posterior portion of the testes; it is the site of sperm maturation. The sperm leave the epididymis and enter the vas deferens (or ductus deferens), which carries the sperm, behind the bladder, and forms the ejaculatory duct with the duct from the seminal vesicles. During a vasectomy, a section of the vas deferens is removed, preventing sperm from being passed out of the body during ejaculation and preventing fertilization.

Questions & Answers

high Dublin divino through Higginbotham
Shubham Reply
1.it allows producers to learn and invent 2.it allows agent to take advantage of economic scale 3.it allow agents to focus in areas of
oyebola Reply
can someone explain the motive of money to me?
Alemogho Reply
ask the question you don't know
opportunity cost
the motive of money is to pay for goods or services. it's also for transaction purposes bet it ordinary or unforseen
Money helps to reduce our scarcity problems. It can satisfy your wants to an extent
How dose economics use science methods to explains it problems
Edmond Reply
according to Jhon Robinson the main problem of economics is what to produce? how to produce? whom to produce? economics tries to solve these problem scientifically by using its theories which are scientific in nature,basically micro and macro theories which just explain what the problem is...
and now the solving techinique is also changed. only theories or its matematical +statistical version is not sufficient so the economist had developed Econometrics which includes economic theory+mathematical economics+statistics, for solving economic problem. This method treats economics as a pure
..pure science so this technique is based on pure scientific methods.
Economics is the scientific study of human behavior so there for science is used to solve economics problems using economics theories
economic is not higly subject of taminadu ...
measurement of elasticity of demand
John Reply
Price elasticity of demand= Percentage change in quantity demanded/ Percentage change in price
For example, suppose that a 10 percent increase in the price of an ice-cream cone causes the amount of ice cream you buy to fall by 20 percent. We calculate your elasticity of demand as
Price elasticity of demand =20 percent /10 percent = 2
In this example, the elasticity is 2, reflecting that the change in the quantity demanded is proportionately twice as large as the change in the price.
what is economic
Samuel Reply
economics is a social science that studies the relationship of human behavior between ends and scare...
Why is economics as a subject is so important to human being?
it's significant in study of managing available resources to satisfy human needs and wants
economics is the science of wealth
it is also said that it is the science of scarcity
why study economic
Economic helps to meet our needs and wants nd to make choices.
careers or jobs associated with economics
Economics is more than choices, scarcity, resources etc. It has a lot to do with psychology, social psychology. Understand motivation for consumer decisons.
How does commercial banks create credit
Penda Reply
what is equilibrium price?
Stella Reply
happen when demand curve and supply curve meet
intersection point of demand and supply curve
the equilibrium price is that price at which the quantity demanded is equal to the quantity supplied... i.e the price at which what people want to buy is equal to what the sellers want to sell.
what is difference between demand and quantity demand
the price which is prevailing in the market ,it is the price at which the consumer is getting maximum satisfaction and the producer is getting maximum profit.
at equilibrium price demand for commodity is equal to supply of commodity..
dear sareel, quantity demand means the quantity of commodity which is demanded at a particular price e,g , your demand is for 4 oranges when price of orange is 5,, on the other hand demand means the whole quantity price relationship, quantity demand is shown on a particular point on demand curve,
sarjeel sbb, reply please...
what is elasticity of demand
what is Economics?
Economics can be defined as a social sciences that study human behavior as a relationship between end and scarce mean which have alternative use
What is taxation
economics is the study of scarcity
dear Suleiman how?
economics is a subject matter that studies different economic activities as directed towards maximization of income at level of individual and maximization of social welfare at the level of society as a whole
economics studies us how to allocate scarce resources to full fill the maximum human wants as the resources have alternative uses..and r very scare to fullfill the human wants as the wants of humans are unlimited
demand is what a buyer is able and willing to buy at a specific price where by quantity demanded is amount of demand the buyer is able and willing to buy at a specific price.
thanks che..
how does commercial banks create credit
write models of Aggregate Supply?
abdi Reply
models of aggregate supply?
Then what's the law of elasticity?
wat happen if money circulation failed to be controlled in any county?
Enockz Reply
the amount of money in circulation increases and cause aggregate demand to rise. Thus, hyperinflation.
what's heteroscandacity
price mechanism refers to the manner which price of goods and services affect the demand and supply of goods and services
heteroscandacity: Is the circumstance where there is unequal variances across the observations.
what is price mechanisms?
Che Reply
price mechanism refers to the manner which price of goods and services affect the demand and supply of goods and services
what is demand
kabeer Reply
desire and ability to pay for a commodity is called demand.
i desire to become Prime Minister of India , is it demand ?please answer---
demand refers to the quantity demanded of a commodity that consumers are willing and able to buy at a particular price over a given period of time
or the willingness power of a commoditythat is backed up by the ability to pay
u r 100% right..
is ability to purchase a perticular goods at any price at a given time.
tanz Rather
ur desire to become a prime minister of lndia is nt demand because u have nt made any efforts or willingness, it is called mere wish or lets say mere desire
Thank you so much dear Abigail Mante for giving answer to my question..
U are welcome
it's ok,dear..
The term ceteris paribus implies that
Demand is the quantity demanded of a commodity at which a consumer is willing and able to purchase at various prices over a given period of time.
ceteris parbus explains the law of demand,which states that at a higher price quantity demanded of a commodity is low and at a lower price quantity demanded of a commodity is high all other things being equal.
U know right girl
ceteris paribus is an economics terms used in situations where we considered other factors to remain unchanged
Thanks for the answer
please how does disposable income affect demand?
hell. somebody must tell me what is the meaning if cetrasparibus
plz. guys
the quantity of a commodity that a consumer ready willing and able to purchase at a particular price and in a particular period of time is known as demand
ceterusparibus means constant i,e,(other things do not change or other things remains constant)
right answer yawer saab
things like what@Rather
bilal sheikh why u has been written what
e,g demand is determined by various factors like price of commodity, uses of good, expected changes in near future, nature of commodity , but when we learn price elasticity of demand , we keep other determinants of demand constant(i,e , we do not expect any change in price of good in near future,etc
i think u understand the term ceterus paribus..
bcz I can not understand
ok bro
wht is other factors
income of consumer, taste,
Gold. Medlist in economics and. Lecturer of economics
hello..what's are the factors affecting cross elasticity of demand.? at least five factors
The time it takes to get a product to market. That time limit has a name call "Just in Time."
thanks guys
hey guys what is inelastic demand
when there is no change in quantity demanded due to change in price then elasticity of demand is inelastic
Hi sucker how are you...
thanks for the answer
Any question about economics
yes. what is the main cause of Heteroscedasticity
waht is elasticity of demand
elasticity of demand means change in quantity demanded divided by change in any of its determinent ,e,g , price ed= % change in quantity demanded/ % change in price.
elasticity of demand is the degree of responsiveness of quantity demanded of a commodity to a change in price of the commodity in question ,price of other related commodity n the consumers income
guys what is monopoly
A single seller in the market.
what are the importance of economics
Eric Reply
what causes the demand curve to shift.
other factors except price.it include test of a consumer fashen presence of substitute advatisment
factors other than price
Its helps to determine the price
state three factors that affect demand and supply
1,price of the product 2,expectations in near future 3,uses of product
1.advertisement 2. expectation of future change in price 3.consumers income
1.alternative products on market. 2.changes on price 3.consumer's expectations
what is cheque
adedayo Reply
resources of exchanging of money to any where
it is a writen order to a bank to pay a specific sum of money to a person
While the American heart association suggests that meditation might be used in conjunction with more traditional treatments as a way to manage hypertension
Beverly Reply
Which event leads to a diploid cell in a life cycle
Nicole Reply

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Source:  OpenStax, University of georgia biology. OpenStax CNX. Dec 09, 2013 Download for free at https://legacy.cnx.org/content/col11585/1.6
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