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Respiratory SystemCardiovascular System
The Respiratory System
Main Parts of the Respiratory SystemNOSE – primary passageway
into and out of the respiratory system (warms, moistens & filters air)
PHARYNX – throat; branches into two tubes-the larynx for air and the esophagus for food (digestive system)
LARYNX – voicebox; contains the vocal cords
Main Parts of the Respiratory SystemTRACHEA – windpipe; large
tube that leads from the larynx to the lungs
BRONCHI – 2 tubes-one bronchus goes to each lung; branches into bronchioles
LUNGS – large spongelike organs that take oxygen from the air and deliver it to the blood
Inside the LungsEach bronchus
branches into thousands of tiny tubes called bronchioles
Each bronchiole branches to form thousands of tiny sacs called alveoli
The alveoli is where oxygen and carbon dioxide are exchanged
BreathingLungs DO NOT
contain the muscles for breathing
Diaphragm contracts and moves down-increases the chest cavity’s volume
Rib muscles contract and lift your rib cage, causing it to expand
Air is sucked in
The Cardiovascular System
The HeartMuscular organ about
the size of your firstLeft side and right side
separated by a thick wall
Heart has 4 chambersAtrium—upper chamber
—one per sideVentricle—lower
chamber—one per sideValves—flaplike
structures (lub-dub)
Path of Blood Through the Heart
1. right atrium receives oxygen-poor blood from the body
2. right atrium contracts and squeezes blood into the right ventricle
3. right ventricle contracts and pushes blood out to the lungs
Path of Blood Through the Heart
4. left atrium receives oxygen-rich blood from the lungs
5. left atrium contracts and squeezes blood into the left ventricle
6. left ventricle contracts and pushes blood out to the body
Blood VesselsArteries—direct blood away from the heart
Capillaries—smallest blood vessels in the body
Veins—direct blood back to the heart
Blood Pressure—force exerted by blood on the inside walls of a blood vessel
Flow of Blood Through the BodyPulmonary
circulation—circulation of blood between your heart and lungs
Systemic circulation—circulation of blood between the heart and the rest of the body