Download Section 18.2 - CPO Science

The Human Body
Chapter Eighteen: Human Body
Systems
• 18.1 Circulation and Respiration
• 18.2 Other Organ Systems
18.2 The integumentary system
• The integumentary system, or skin, has
several functions:
– Skin is the first line of defense for blocking moisture
and invaders like bacteria.
– Skin contains sweat glands that help regulate your
body temperature.
– Skin contains nerve endings that allow you to sense
your environment through touch and pressure.
18.2 Skin
• The epidermis is the
thin, outer layer that you
see.
• The dermis lies
underneath and is made
of connective tissue and
protein fibers.
• The subcutaneous fat
layer functions as
insulation for your body.
18.2 The endocrine system
• The endocrine system consists of a
group of glands that produce hormones
and release them into the blood.
• The endocrine system controls a variety
of important functions such as cell
processes, reproduction, and response to
stress.
18.2 Feedback control systems
• Your body has feedback
control systems that
turn your endocrine
glands on or off.
• These systems control
the levels of hormones in
your blood much like a
thermostat controls the
temperature in your
house.
18.2 Digestive system
• The digestive
system is a group
of organs that takes
in and digests food,
and eliminates solid
wastes.
18.2 Digestive system
•
Can you find these organs?
1.
2.
3.
4.
5.
6.
7.
8.
9.
rectum
small intestine
gall bladder
liver
stomach
large intestine
appendix
pancreas
esophagus
18.2 Excretory system
• The excretory system is a group of
organs that excrete chemical wastes.
• These include water, carbon dioxide,
salts, and urea—a by product of protein
reactions.
• Organs of the excretory system include
the kidneys, liver, lungs, and skin.
18.2 The male reproductive system
• The male
reproductive
system produces
sperm and
transfers it to the
female reproductive
system.
18.2 The male reproductive system
• The testes produce
sperm and the male
hormone,
testosterone.
• A hormone is a
chemical that
regulates body
functions.
18.2 The female reproductive
system
• The female
reproductive system
produces eggs,
ensures
development of
fertilized eggs, and
gives birth.
18.2 The female reproductive
system
• The ovaries are about the size of
a large olive.
• Each ovary produce eggs, also
called oocytes.
Health Connection
Skin Grafts
• There are many types of
burns, including those
caused by fire, heat,
chemicals, electricity,
sunlight, and nuclear
radiation.
• Patients with severe
burns are often treated
with skin grafts.
Activity
Build a Lung Model
• In this activity you will
build a model of a
single lung and see for
yourself how breathing
really works.