Transcript circulation-respiration

Circulatory/Respiratory
System
Circulatory/Respiratory
System
Why Have a Circulatory System?
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Small organisms do not need a circulatory
system to supply cells with food and
oxygen.
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They rely on diffusion.
Larger organisms need a system to move
nutrients and gases.
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Not all cells come into contact with the
environment.
Circulatory system
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A transport system responsible for;
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Supplying cells with nutrients and oxygen.
Helps remove wastes and carbon dioxide gas
(CO2).
Consists of the:
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Heart
Blood Vessels
Blood
Two Circulatory Pathways
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Pulmonary Circulationcarries blood to and
from the lungs.
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Systemic Circulationcarries oxygen rich
blood to body and
oxygen poor blood
from the body to the
heart.
The Heart
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The Human heart has 4
chambers
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Right atrium- accepts
oxygen poor blood from the
body
Right ventricle- pumps
oxygen poor blood to the
lungs
Left atrium- accepts oxygen
rich blood from the lungs
Left ventricle- pumps
oxygen rich blood to the
body
Blood Vessels
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Arteries- carry blood away from the heart
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All arteries carry oxygen rich blood except the
pulmonary artery which carries oxygen from
the heart to the lungs.
Capillaries- very small thin blood vessels
that exchange O2 and CO2 with cells.
 Veins- return blood to the heart.
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Circulation in action

Now watch this video to see circulation in
action.

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go to www.brainpop.com (Login: leehsst
password: science). Go to Health
Circulatory System  Circulatory System
Blood- composition
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Plasma- protein rich fluid
that carries blood cells.
Erythrocytes (red blood
cells)- carry oxygen and
nutrients to cells, and CO2
waste from cells.
White blood cells- produce
immune response, fight
disease.
Platelets- protein and cell
fragments that cause blood
to clot when you have a cut.
Hemoglobin
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Protein in blood that carries oxygen for
the cell.
More About Blood

Now watch this video to learn more about
blood .

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go to www.brainpop.com (Login: leehsst
password: science). Go to Health
Circulatory System  Blood.
Circulatory Diseases
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Atherosclerosis- condition
where fatty acids build up
forming plaques on the
walls of arteries.
High blood pressure
(Hypertension)- forces
the heart to work harder.
May weaken or damage.
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Heart
Blood vessels
Heart Attack
Stroke
Respiration
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Cellular respiration- Chemical reactions
that use oxygen to extract energy from
sugar.
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Location = mitochondria
vs.
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Respiration- Exchange of oxygen and
carbon dioxide that occurs in the lungs.
Quick Write
On the back of your paper:
Describe the Structures and Functions
related to the Circulatory System.
Use words like:
Oxygen, Carbon Dioxide, Veins, Arteries,
Atria, Ventricle
Respiratory System
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Function- To facilitate the transfer of
oxygen into the blood from the air and the
removal of carbon dioxide from the blood.
Air Passage
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Nose/Mouth- Humidify air
Pharynx- Blood/food
passage
Larynx- Voice box
Trachea- windpipe
Bronchus- air passages into
the lungs
Bronchioles- smaller
branching tubes in the
lungs
Respiration
Vocal Cords
Plastic Lung
Cast
Alveoli
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Tiny air sacs at the end of bronchioles that
permit CO2/O2 gas exchange. With the
blood.
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In close contact with capillaries.
Provides more surface area for gases to diffuse
into and out of the blood.
Breathing In
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How does air move
into the lungs?
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Diaphragm- a muscle
that crosses the
bottom of your chest
cavity.
Diaphragm moves
down- increasing the
volume of your chest.
Air pressure in chest
drops and air flows
in.
Breathing outDiaphragm
moves updecreasing the
volume of your
chest.
 Air pressure in
chest increases
and air flows
out.
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More About Blood

Now watch this video to learn more about
respiration.

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go to www.brainpop.com (Login: leehsst
password: science). Go to Health
Respiratory System Respiratory System.
How is breathing controlled?
1.
2.
3.
4.
Your nervous system
senses the amount of
CO2 in your blood.
When the CO2 levels
rise a signal is sent to
the brain telling.
The brain send a signal
increasing your
breathing rate.
Too little CO2 and the
signal is sent to slow
down your breathing
Why is smoking bad?
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Nicotine- stimulant
increases heart rate blood
pressure.
Carbon monoxide- poison
that block O2 transport in
the blood.
Bronchitis- mucus in the
lungs
Emphysema- reduced
elasticity of lungs making it
hard to breath
Cancer
Quick Write
On the Back of your paper:
Describe the structures and functions
related to Respiratory system.
Use words like:
Oxygen, Carbon Dioxide, Alveoli, Bronchi,
Lungs, Capillaries
Circulation Respiration Lab
Procedure:
1. Make sure you have a partner and a watch.
2. Measure your resting heart rate by counting the number of
pulses in 15 second.
3. Walk down the hallway at a pace of approximately one
step/second. Have your partner count off the seconds.
4. Measure your heart rate immediately after walking down
the hallway.
5. Wait until your heart rate has returned to its resting rate.
Have your partner time how long it takes
6. Run up two flights of stairs as fast as you can and measure
your heart rate when you reach the top.
7. Have your partner time how long it takes for your heart
rate to return to its resting rate.
Group practice
Do a rally coach with your partner to label
the parts of the respiratory systems and
answer the questions.
homework
Draw the important organs for the respiratory
system and circulatory system in your body book
and the excretory system on a different page.
Write about the systems’ functions on the left side
of the book and each organ and its function on the
right side of the book