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Science- 5th grade Human Body Systems

This is a study guide for 5th grade science about the human body systems: the circulatory system, the respiratory system, and the digestive system.
blood vessels, with thick walls, that carry blood away from your heart to other parts of your body
The smallest kind of blood vessel in your body
flaps (like a door) that keep your blood flowing in 1 direction
red blood cells
Carry oxygen to cells
white blood cells
work hard to protect the body from germs
Cause blood clots to form making less of blood from cuts
3 kind of blood vessels
Arteries, capillaries, & veins
Circulatory system
transportation system to move food & oxygen to each cell & then take away cell waste.**
Contains plasma, platelets, red blood cells, & white blood cells.
Carries food, water, and some chemicals to cells and takes waste away from cells.
Double pump.
Right side collects blood that has circulated through the body & pumps into the lungs.
Left side collect oxygen rich blood from the lungs & pumps to the arteries.
right atrium
Relaxes & fills with blood carrying wastes and carbon dioxide from the body cells, then it contracts squeezing blood into the right ventricle.
Right ventricle
Fills with blood and contracts pumping blood into an artery leading to the lungs.
Left atrium
blood flows from the lungs into the left atrium and then it squeezes the blood into the left ventricle.
Left ventricle
Pumps oxygen rich blood away from the heart into your body's largest artery called the aorta, from there, smaller arteries branch off as blood rushes to the body cells.
Sticky, thick fluid that traps dust, germs, & other things that might be in the air.
tube that carries air from the larynx to the lungs
upper part of the trachea that contains vocal cords
air sacs
located at the end of bronchioles, this is where oxygen enters the blood & carbon dioxide leaves the blood
respiratory system & circulatory system
work together to deliver oxygen to cells.
inhaled air
21% 02 & 4% CO2
exhaled air
16% 02 & 9% CO2
digestive system
breaks down food so that nutrients can enter the blood & reach the body's cells**
tube that carries food from your mouth to your stomach
flap that covers your trachea when you swallow so food doesn't go down the wrong pipe
salivary glands
makes saliva which helps digest food & makes it easier to swallow
small finger-like structures that line your small intestines that help absorb food
urinary system
rids the blood of most wastes produced by the cells.**
clean the blood & control the level of salt, water, calcium, nutrients & other chemicals in the blood.
circulatory system
heart,blood,blood vessels
respiratory system
nose,mouth,larynx,trachea,bronchi,bronchioles,air sacs, diaphragm, lungs
digestive system
teeth,tongue,salivary glands,epiglottis,esophagus,stomach,intestines
Inhaled air is
21% 02 and 4% CO2
Exhaled air is
16% 02 and 9% CO2
Purpose of respiratory sytem
Exchanges gases between the outside air and the blood.**
blood vessels that take blood from cells back to the heart.