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The Human Body - 7th grade science


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sneeze and cough
way to clean out dust and germs from the respiratory system
muscle in your body that makes your lungs fill and empty
mucus membrane and hairs
filter air to keep germs and dust from getting into respiratory system. Warms air
You don't think about breathing. Controlled by the brain.
Carbon Dioxide and Oxygen
Body uses oxygen. Body gets rid of CO2
Voice Box
Also known as larynx. Contains 2 vocal chords. Create sounds for speech
Tiny sacs at the end of the bronchial tree where oxygen and carbon dioxide are exchanged
Bronchial Tree
Connects the windpipe to the alveoli
Gastric Juices
pepsin and acid
causes chemical digestion of protein
Esophageal Sphincter
prevents food from reentering the esophogus
Surround cells.....semi-permeable
Movement of molecules from a greater concentration to a lower concentration. Through air, water and membranes
passive transport
no energy needed - "diffusion"
each enzyme can only digest one type of nutrient
Small intestine (DAN)
digests, neutralizes, absorbs
Active transport
requires cell's energy to let larger nutrients into all.
Pancreatic Juice
packed with enzymes: digests carbs, proteins, fat. Neutralizes the acid.
stores bile
2.5 cm
diameter of the small intestine
Pyloric Sphincter
Between stomach and small intestine (valve at bottom of the stomach.
breaks up fat in the small intestine. Made in the liver and stored in the bladder
Closed System
No entry or exit. " The circulatory system" William Harvey discovered this - heart, arteries , veins, capillaries and blood
"the heart"
smallest vessels carry O2 (oxygen) and nutrients to every cell and take CO2 (carbon dioxide) and H2O (water) away
The "pumps"
Left Ventricle - pumps to the body
Right ventricle - pumps to the lungs
Thicker walls than atrium - left side , lots thicker
Bigger to Smaller Vessels -
Away from the heart
( heart to the arteries to the capillaries to the cell)
Smaller to bigger vessels
Back tot he heart.
( cells to the capillaries to the veins to the heart)
4 chambers
Right and left atrium
Right and lefft ventricle
two pumps
2 ventricles
side by side
separated by septum

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