Saint Pedro Poveda College
Junior High School Department
S.Y. 2019 – 2020
Science and Technology 9
Session 1
C.N. __19___
Name: _____Anya Garcia_____________________________________________ Grade 9 - D_____________
CIRCULATORY SYSTEM
I. Identify the parts of the human heart.
1.
2.
3.
4.
5.
6.
7.
8.
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10.
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12.
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___superior vena cava____________
____right pulmonary artery_________
____right pulmonary veins_____________
____pulmonary valve_________________
____right atrium___________________
____tricuspid valve___________________
____right ventricle___________________
____inferior vena cava________________
____arteries______________
____aorta______________
____left pulmonary artery_____________
____left pulmonary veins______________
____left atrium_____________________
____bicuspid valve_________________
___aortic valve_______________
____left ventricle______________
____interventricular septum___________
II. Complete the following scheme of blood circulation in the human body.
Oxygen-poor blood enters the right atrium through the tricuspid valve to the ____right ventricle_______ . Through the
_____pulmonary____ valve, blood is pumped to the pulmonary trunk then to the ____left pulmonary artery___ reaching
capillary beds of the lungs. From the lungs, oxygen rich blood goes and enters to the _pulmonary veins_____ to the __left
atrium___ of the heart then through the __bicuspid_______ valve to the chamber called____left ventricle______. Oxygen
rich blood will exit the heart through the ___aortic________ valve to the largest artery called ___aorta___. Blood will
reach the systemic arteries to the ____capillaries________ of the tissues to the systemic veins to the ___superior vena
cava______ and ____inferior vena cava_______ returning to the right atrium of the heart.
III. Identify the different types of blood vessels in the picture.
blood back
the heart
blood from
the heart
e.
b.
d.
c.
a.
b.
c.
d.
e.
veins
venules
capillaries
arterioles
arteries
IV. Answer the following questions briefly.
1. What is the function of the heart? Explain your answer in 3 to 5 sentences.
The main function of the heart is the central pump for blood to circulate throughout the body. It pumps deoxygenated
blood to the lungs for oxygenation, which returns to the heart. Oxygenated blood in the heart is pumped from the left
ventricle to the different parts of the body to be used by different organs, tissues and cells. Deoxygenated blood returns
to the heart in the right atrium.
2. Differentiate the roles of pulmonary and systemic pathways.
The pulmonary blood vessels are the pathways of blood that is carried to and from the lungs for oxygenation of the
blood. The pulmonary arteries carry deoxygenated blood to the lungs for gas exchange, while pulmonary veins
bring it to the heart. Systemic pathways are used for the transportation of oxygenated blood to other parts of
the body for oxygen to be used, and deoxygenated blood to return to the heart.
3. Identify the four different valves found in the human heart. What is the function of these valves?
The four valves in the human heart are the pulmonary, aortic, tricuspid and bicuspid valves. The pulmonary and aortic
valves are those opened by the pressure from the contraction of the ventricles. The tricuspid and bicuspid valves are
located between the atrium and ventricles for both left and right sides. Both the tricuspid and bicuspid valves contain
muscular fibers that prevent them from opening the wrong way when blood is pumped.
4. Identify the differences between arteries and veins according to its structure and function.
Arteries are thicker blood vessels that carry blood from the heart to other parts of the body. They branch out into
arteries, and have higher blood pressure than veins. Veins carry blood from the lungs and other parts of the body to the
heart. From capillaries, venules branch into veins.
5.
What is the sound produced by your heart? What does this sound mean?
The sound produced by the heart is “lub-dub.” The lub sound comes from the closing motion of the tricuspid and
bicuspid valves. The dub sound is from the vibrations of the closing of the pulmonary and aortic valves.