Living Things

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Controlling Body Processes Ms. De Los Rios 6th
grade science
The Male and Female Reproductive
Systems Ch.13.3
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What are the Functions of the Reproductive
Systems? Pg. 517

• An egg cell and a sperm cell join in a process
  called fertilization.
• An egg is the female sex cell.
• The male sex cell is a sperm.
• Fertilization is part of sexual reproduction, the
  process by which males and females produce new
  individuals.
• When fertilization occurs, a fertilized egg, or
  zygote containing all the information needed to
  produce a human being is produced.

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The Male and Female Reproductive Systems Fig. 1
pg. 517
Egg and Sperm An egg is one of the largest cells
in the body. A sperm cell is much smaller than an
egg and can move. Describe each of the cells
involved in fertilization.
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Male Reproductive System pg. 518

• The male reproductive system is specialized to
  produce
• sperm cells and the hormone testosterone.
• The structures of this system include
• the testes, scrotum, and penis.
• The testes are clusters of tiny, coiled tubes
  where sperm are formed and testosterone is
  produced.
• The hormone testosterone controls the development
  of adult male characteristics.
• The testes are located in a pouch of skin called
  the scrotum.
• Sperm travel through tubes in the male
  reproductive system, mixing with fluids produced
  by nearby glands. This mixture of sperm cells and
  fluids is called semen. Semen leaves the body
  through an organ called the penis.

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The Male Reproductive Systems Fig. 2 pg. 518
Structures of the Male Reproductive System What
is the structure and function of each organ?
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The Male Reproductive Systems Fig. 3 pg. 519
Sperm Production and Passage From the Body Sperm
are produced in the testes and leave the body
through the urethra.
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The Female Reproductive System pg. 518

• The female reproductive system is specialized to
• produce eggs
• nourish the developing baby until birth.
• It also produces hormones including estrogen.
• The organs of this system include
• the ovaries, Fallopian tubes, uterus, and
  vagina.
• The ovaries are the female reproductive
  structures that produce eggs.
• The ovaries are also endocrine glands that
  produce hormones, including estrogen, which
  triggers the development of some adult female
  characteristics.
• Each month, one ovary releases a mature egg into
  the nearest Fallopian tube, a passageway from the
  ovary to the uterus, a hollow muscular organ. The
  baby leaves its mothers body through the vagina,
  a muscular passageway.

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The and Female Reproductive Systems Fig. 4 pg. 520
Structures of the Female Reproductive System The
word ovary comes from the Latin word ova meaning
eggs. What are the functions of the ovaries and
the Fallopian tubes?
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The Female Reproductive Systems Fig. 5 pg. 521
Egg Production and Passage From the Body Each
month, an ovary produces an egg that leaves the
body if it is not fertilized. What are the
functions of the uterus and the vagina?
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Did You Know????

• When the female reproductive system becomes
  mature, the ovaries contain about 400,000
  undeveloped eggs. However, only about 450 of
  those eggs will actually leave the ovaries and
  reach the uterus during a typical womans life.

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Menstrual Cycle

• An egg develops and is released about once a
  month in a mature woman. This event is part of
  the menstrual cycle, or the monthly cycle of
  changes that occurs in females. During the
  menstrual cycle, an egg develops in an ovary. At
  the same time, the lining of the uterus thickens
  in a way that prepares the uterus for a
  fertilized egg.

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The Female Reproductive System fig. 4 pg. 522
The Menstrual Cycle The menstrual cycle takes
about 28 days.
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The Male and Female Reproductive Systems pg. 523
Use the data in the table to complete a line
graph. What are the axes? What would be a good
title for the graph?
Assess your und.
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Pregnancy and Birth
The Amniotic Sac and the Placenta A fetus needs
nourishment and protection to develop properly.
What are the functions of the amniotic sac and
the placenta?
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Pregnancy and Birth
A pregnancy is often divided into three stages
called trimesters. Each trimester is three
months. How much weight does a developing fetus
gain in the first trimester?
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Pregnancy and Birth
Birth Contractions in the uterus signal the start
of labor. Describe the events in each stage of
birth.
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Pregnancy and Birth
Multiple Births The delivery of more than one
baby from a single pregnancy is called a multiple
birth. Twin births are the most common multiple
births. Other multiple births, such as triplets,
can also be fraternal or identical.