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CIRCULATORY SYSTEM: BLOOD
17 JULY 2013
Lesson Description
In this lesson we:
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Look at the need for a transport system
Discuss the difference between an open blood system and closed blood system
Identify the various blood vessels
Describe the structure and functions of arteries, veins and capillaries
Describe the structure of the heart and associated blood vessels
Key Concepts
Circulation
Why do we need a Transport System?
There is a need to pick up & deliver the supplies & wastes around the body.
Why do the following organisms NOT need a circulation system?
Humans and other mammals have a closed circulatory system:
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This means that circulating blood is pumped through a system of vessels
This system consists of the heart (pump), series of blood vessels and the blood that flows
through them.
As blood moves through the circulatory system it moves through 3 types of blood vessels:
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Arteries carry blood AWAY from the heart.
Veins carry blood back TO the heart.
Capillaries, which are located between the arteries and the veins, reach those areas where
arteries and veins cannot reach.
Artery
Vein
The Heart and Associated Blood Vessels
Position of the Heart
External Heart
Internal Heart
Questions
Question 1
Tabulate the structural and functional differences between arteries, veins and capillaries.
Question 2
a.) Label the following diagram:
b.) Provide the functions of the major blood vessels shown in the diagram.
c.) Provide the name and functions of two other important blood vessels not shown in this
diagram.
d.) Name and explain the significance of the valves found ….
i.
between the right atrium and right ventricle
ii.
between the left atrium and left ventricle
iii.
in the pulmonary artery
iv.
in the aorta
e.) Explain how the heart is protected.
Question 3
(Adapted from DBE, Exemplar 2.4)
Study the diagrammatic representation below showing a transverse section through a vein and an
artery.
a.)
b.)
c.)
d.)
Which diagram (A or B) represents an artery?
Explain your answer to QUESTION (a.).
Which blood vessel (A or B) has valves?
Provide the labels for the parts numbered:
i.
1
ii.
2
iii.
3
Question 4
Explain how the heart is suited for its function.
Question 5
Distinguish between an open blood system and a closed blood system.