Transcript The Male Reproductive System

Ch. 20.2.1
THE MALE REPRODUCTIVE
SYSTEM
 The Endocrine system has 2 major organs
responsible for the changes humans go
through from child to adult:
 Ovaries
 Testes
Sexual Reproduction
 Life begins as a single cell.
 That single cell is produced by the joining of
two other cells:
 Egg – Female sex cell
 Sperm – Male sex cell
Fertilization
 Fertilization is the joining of the sperm and
egg.
 It is an important part of sexual reproduction.
 Sexual reproduction involves the production
of eggs by the female and sperm by the male.
 The egg and sperm join together during
fertilization.
Fertilization
 A fertilized egg (egg + sperm) is known as a
Zygote.
 They zygote is a SINGLE cell (egg + sperm).
 Inside the zygote are chromosomes. These
chromosomes hold ALL your DNA.
 It has all the information you need to grow
into a human.
Male Reproductive System
 The male reproductive system is specialized
to produce sperm and the hormone
testosterone.
 These structures of the male reproductive
system include the:
 Testes
 Scrotum
 Penis
The Testes
 Oval shaped. Males have 2 (singular testis)
 The testes or made of hundreds of tiny coiled
tubes.
 Sperm is produced in these tiny coiled tubes.
Testes
 Produce Testosterone – a hormone that
controls the development of physical
characteristics in mature men.
 Facial Hair
 Deepening Voice
 Broadening of Shoulders
 Ability to produce sperm
Testes
 Are located in the Scrotum.
 The scrotum is located in an external pouch
of skin allowing for a slightly lower body
temperature.
 Sperm need a slightly lower temperature to
remain healthy.
Sperm Production
 Sperm production begins in the early teenage
years for males.
 The head of the sperm contains half the
chromosomes needed for a human’s DNA.
 It also has a tail to allow for mobility
(movement like swimming)
The Path of Sperm Cells
 Sperm cells form in the testes.
 Then they pass through other
structures/tubes and mix with fluids from
nearby glands.
 This mixture is called semen.
 In each drop of semen, there are 5 – 10 million
sperm cells!
 This fluid allows the environment for sperm
to swim.
 Semen leaves the body through and organ
called the penis.
 The tube the semen exits through is called
the urethra.
 Urine also exits the body through these
tubes.