Name: _________________________________ Date: _________ Period: ____
Intermediate Science
Mr. Vorstadt
Circulatory System Worksheet
_____ 1. From what source do cells get their food?
A) Blood
B) Oxygen
C) Other cells
D) Carbon dioxide
_____ 2. Why is oxygen important to blood and to the cells?
A) Oxygen helps the blood to clot.
B) Oxygen brings food to the cells.
C) Oxygen is necessary for cell respiration and energy.
D) Oxygen is not important -- carbon dioxide is the most important
substance to the body.
_____ 3. Why is blood that flows from the lungs to the heart bright red rather than dark
Red?
A) Oxygen makes it red.
B) Carbon dioxide makes it red.
C) Gastric juices produce the red color of the blood.
D)The lungs add a pigment (dye) to blood as it flows through them
_____ 4. Which type of blood vessels carries blood away from the heart?
A) Veins B) Arteries C) Capillaries
D) Arteries, veins and capillaries
_____ 5. What is the circulatory system?
A) The body's breathing system
B) The body's system of nerves
C) The body's food-processing system
D) The body's blood-transporting system
_____ 6. What part of the blood carries minerals, vitamins, sugar, and other foods to the
body's cells?
A) Plasma
B) Platelets
C) Red Blood Cells
D) White Blood Cells
_____ 7. Which of the following can best be compared to soldiers?
A) Lungs B)Capillaries C) Red Blood Cells D) White Blood Cells
_____ 8. What part of the blood starts the clotting process?
A) Plasma B)Platelets
C)Red Blood Cells
D) White Blood Cells
_____ 9. What is the main job of the red blood cells in the blood?
A) To clot blood
B) To fight disease
C) To transport O2 to the body's cells and carry away CO2 from the cells
D) To transport CO2to the body's cells and carry O2away from the cells
_____ 10. Why does blood turn dark red as it circulates through the body?
A) It starts to clot.
B) It gets old and dirty flowing through the body.
C) The oxygen in it is replaced with carbon dioxide.
D) The farther blood is from the heart, the more dark red it is.
_____ 11. What would happen to people who have an open wound and whose blood
did not clot naturally?
A) They would clot normally.
B) Nothing. Clotting is not important.
C) They would have to take special clotting drugs.
D) They would have to take regular doses of insulin.
_____ 12. What is the function of the blood vessels and capillaries?
A) They pump blood to the heart.
B) They filter impurities from the blood.
C) They carry blood to all parts of the body.
D) They carry messages from the brain to the muscles.
_____ 13. What would happen if a clot occurred in an undamaged blood vessel?
A) You would bleed to death.
B) A scab will form on the skin surface.
C) Platelets stick to edges of the cut and to one another, forming a plug.
D) The flow of blood to tissues beyond the clot may be cut off.
_____ 14. What happens to blood when it is pumped into the capillary vessels of the
lungs?
A) Platelets are exchanged for plasma.
B) Carbon dioxide is replaced with oxygen.
C) Blood fills the lungs and causes coughing.
D) Nothing -- the lungs are just a place blood goes through on its way
back to the heart.
_____ 15. Which element in the blood is Ameba like and colorless?
A)Plasma
B) Platelets C) Red Blood Cells D) White Blood Cells
Instructions: Label the superior vena cava, inferior vena cava, aorta, pulmonary
arteries, pulmonary veins, right atrium, right ventricle, left atrium, and left ventricle.
Label where blood enters the heart from the body and lungs.
Label where blood leaves the heart to go to the body and lungs.
Use two different color pencils to show the pathway of blood through the heart. Make a
key to identify what the colors represent.
Use the words in the
box to fill in the
blanks.
veins
arteries
nutrients
capillaries
away
transport
O2
energy
dark
heat
circulatory
lungs
CO2
bright
to
blood
heart
pumped
intestine
atmosphere
All animals need to ______________________ materials around to the different parts of their
bodies. This is the job of the ___________________ system. The circulatory system consists of
a liquid called _________________, a pump called the __________________ and a series of
vessels called ___________________ and __________________.
One thing that must be transported around is a gas called ______. Oxygen enters the
blood through the ________________. It is then _______________ through the heart and
around the body where it is used along with food to make _______________. The body
produces another gas called ____________, which is a waste product. This gas is carried
back to the heart and then to the lungs where it is released back into
the _______________.
The vessels that transport blood _________ from the heart are called arteries.
The blood in arteries is _____________ red because it is rich in oxygen. The vessels that
transport blood __________ the heart are called veins. The blood in veins is
______________ red because it is low in oxygen. ________________ are small vessels that
join the arteries and veins. _____________________ from food are also transported
around the body by the circulatory system. They enter the blood from the small
___________________________. The circulatory system also helps to regulate temperature
by transporting ______________ around the body.
Find the circulatory
system words
below in the grid to
the left.
aorta
artery
blood
bright red
capillary
carbon dioxide
circulate
dark red
four chambers
heart
lungs
nutrients
oxygen
pump
red blood cells
transport
valve
vein
water
white blood cells