Download Unit 2

UNIT 2
Lesson 2
Big Idea
HO DO THE CIRCULATORY
AND RESPIRATORY SYSTE S
W RK TOGET ER?
Heart Rate
Lower
Class BPM: __________
Higher
Field BPM: ___________
CALIFORNIA STANDARDS
Science Standard 2.b: Blood
circulates through the heart
chambers, lungs, and body and
carbon dioxide (CO2) and oxygen
(O2) are exchanged in the lungs and
tissues.
CALIFORNIA STANDARDS
Investigation and
Experimentation
6.c – Plan and conduct
a simple investigation
based on a student
developed question
and write instructions
others can follow to
carry out the
procedure.
Investigation and
Experimentation
6.d - Identify
the dependent
and controlled
variables in an
investigation.
INPUT
Circulatory system – The body system
that transports blood loaded with oxygen
and nutrients to each cell of the body.
Respiratory system – The body
system that exchanges oxygen and
carbon dioxide between your body and
the environment.
INPUT
The Heart (Pg. 156)
The heart is the pumping organ of the body.
Some animal’s hearts are very simple and
some are very complex.
An earthworm’s heart is just a muscular part
of a large blood vessel.
A crayfish’s heart has two chambers
A human heart is a double pump made up of
four chambers
INPUT
INPUT
Before your heart beats, two
chambers fill with blood.
The heart pumps this blood
throughout the body creating a
pulse.
Blood travels in a certain path.
INPUT
Blood Path
Blood from the right side of the body
returns to the heart.
The heart then pumps to the lungs.
Carbon dioxide is exchanged for oxygen.
Blood is then pumped to the left side of the
heart.
Then it is pumped to the entire body.
INPUT
The Circulatory System (Pg. 158)
It transports blood loaded with oxygen
to the cells and takes away waste from
the cells.
It is made up of the heart, blood
vessels, and blood.
INPUT
Blood is connective tissue:
Plasma (liquid) is mostly water and
carries dissolved food and waste
Red blood cells (solid) carry oxygen
White blood cells (solid) help fight
infection
Platelets (solid) help clot the blood
to stop bleeding.
INPUT
Blood leaves the heart and travels through
arteries.
Arteries bring the blood to small vessels
called capillaries.
Here materials exchange between the
blood and body cells.
Capillaries have thin walls and touch
every body cell.
INPUT
Materials cross through the walls of the
capillaries and through the membranes
of the cells.
Capillaries then bring the old blood to
large vessels called veins which return
to the heart.
INPUT
The Respiratory System (Pg. 160)
This system exchanges oxygen and carbon
dioxide.
Your diaphragm is a muscle below your ribs
that helps pull in air.
Air flows in and travels down tubes to the
lungs.
The tubes end in tiny sacs in the air.
INPUT
Working Together (Pg. 162)
Respiratory system brings air into the body.
Oxygen passes from sacs in the lungs to
the capillaries and into the bloodstream.
Both systems are needed to do the job the
body needs.
SUMMARY
In this lesson, you learned
how the circulatory system and
the respiratory system work
together. They carry materials in
the body and exchange gasses in
the lungs.
UNANSWERED QUESTIONS
How does smoking affect the way the
respiratory and circulatory system work?
Why do you feel like you cannot breathe
when you get the wind knocked out of you?
Ask your own…
WHERE WOULD YOU EXPECT TO SEE THE
MOST CASES OF RESPIRATORY DISEASE?
THE LEAST?
MODELING
1) Where does gas exchange take
place in the body?
It takes place in tiny air sacs in the
lungs.
MODELING
What are the four chambers in the
heart?
Right and left atrium and the right
and left ventricle.
CHECK FOR
UNDERSTANDING
What carries blood away
from the heart?
Arteries
CHECK FOR
UNDERSTANDING
What is the name of the
muscle that helps pull air
into your body?
Diaphragm