Lesson 1.1
Life Cycle
By Carone
Fitness
Life Cycle
Human Life Cycle
The Human Life Cycle has 6 stages:
• Birth
• Infancy
• Childhood
• Adolescence
• Adulthood
• Death
1
Life Cycle
Birth
Before birth, we are a tiny group of cells
called
ll d an embryo.
b
I iti ll an embryo
Initially,
b
is about the size of the dot over the
letter i. The embryo continues to divide,
thereby forming the layers of cells that
will eventually become the systems
within the human body. At the end of
the first 8 weeks, the embryo develops
into a fetus. The fetus grows within the
female for approximately 9 months.
Birth is when the fetus is delivered out
of the womb.
Life Cycle
Infancy
During infancy, the baby is
completely
l t l d
dependent
d t on h
her
parents. The baby’s parents
must meet all of her physical,
mental, and emotional needs.
The personal wellness of the
each parent greatly affects
the baby’s health. For
example, a nursing mother
must be sure to eat healthy
foods, so the baby gets the
physical nourishment she
needs.
2
Life Cycle
Childhood
During childhood, the child is still very
d
dependent
d t on h
her parents.
t Ph
Physically,
i ll
the child is able to do some things on her
own, such as walking, talking, and
playing. Emotionally, the child is not able
to handle difficult situations. For example,
during conflict she might throw tantrums,
whine, and pout.
Life Cycle
Adolescence
During adolescence, the
i di id l goes th
individual
through
h many
physical, mental, and
emotional changes. These
changes prepare the
individual for adulthood. An
adolescent is less dependent
on her parents, but her
primary concern is her own
needs.
3
Life Cycle
Adulthood
As an adult, the individual has learned
th t allll people
that
l have
h
needs.
d She
Sh iis now
emotionally able to help meet the needs
of others. Physically, the health habits
that she has developed through the
years begin to take their toll.
©Life art
Life Cycle
Death
The death rate for humans is 100%.
Th
There
iis no escape ffrom d
death.
th Death
D th
may occur during any of the stages of
the life cycle.
Focusing on personal wellness may help
delay death. It also helps improve the
quality of life because you are able to
li lif
live
life tto th
the ffullest.
ll t
4
Life Cycle
Body Systems
Your body systems develop in the first
stage
t
off the
th life
lif cycle.
l Wh
When one off
those body systems fails, your life cycle
ends. Therefore, it is important to have
a basic understanding of your body
systems.
©Life art
Life Cycle
Interrelated Body Systems
You should also keep in mind that your
b d systems
body
t
work
k ttogether
th and
d affect
ff t
one another. For example, in order to
walk, your skeletal system and
muscular system work together to
create movement. If you break the
bone in your leg (skeletal system),
having your leg in a cast will also result
in a loss of muscle tone (muscular
system).
5
Life Cycle
Circulatory System
The circulatory system sends blood
th
through
h th
the b
body.
d Bl
Blood
d gives
i
your
body the oxygen and nutrients it needs.
Blood also carries away waste
products.
©Life art
Life Cycle
Nervous System
The nervous system is the control
center of the body. Your nervous
system controls your memory, the way
you walk, and much more! Your
nervous system is even hard at work
while you are sleeping.
©Life art
6
Life Cycle
Muscular System
The muscular system controls the
movementt off the
th body.
b d Thi
This iincludes
l d
movements such as lifting, bending,
talking, etc. The muscular system also
controls the movement within your
body, such as your heart beating or
your intestines moving and digesting
food.
©Life art
Life Cycle
Skeletal System
The skeletal system gives the body
structure.
t t
Without
With t the
th skeletal
k l t l system,
t
you would not even be able to sit up or
move. Your body would be like a bag
full of jello. The skeletal system also
helps protect your internal organs.
©Life art
7
Life Cycle
Respiratory System
The respiratory system takes in fresh
air,
i gets
t rid
id off used
d air,
i and
dh
helps
l you
talk.
©Life art
Life Cycle
Digestive System
The digestive system uses the food
you eatt to
t gett the
th energy and
d nutrients
ti t
you need.
©Life art
8
Life Cycle
Immune System
The immune system
protects the body from
diseases, germs, and
bacteria.
Life Cycle
Urinary System
The urinary system gets rid of waste
and
d extra
t water
t your body
b d d
does nott
need.
©Life art
9
Life Cycle
Reproductive Systems
Male and females have different reproductive organs. However, they both
have the same primary purpose. The biological function of the
reproductive systems is to produce offspring.
Male Reproductive System
Female Reproductive System
LifeArt image copyright 2007 Lippincott Williams & Wlikins. All Rights Reserved.
Life Cycle
Endocrine System
The endocrine system makes and
releases
l
h
hormones. Hormones
H
are
chemicals within your body that control
cells that perform important bodily
functions. For example, the endocrine
system is responsible for the changes
you experience during puberty. Puberty
is the period of time when males and
females become physically able to
reproduce.
©Life art
10
Presented
By Carone
Fitness
11