The Circulatory System and the Heart B3 2 Transporting
Materials
Slide 3
Requirements 11.2.1 Dissecting boards Dissecting scissors
Gloves Aprons Newspaper/bags for disposal Safety specs White trays
Waterproof pens Laminated cards Alternative cut out activity for
those not wanting to do dissection, scissors, colours and glue
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Objectives Students should learn: there are two separate
circulation systems that the heart pumps blood to the organs via
the arteries and the blood returns to the heart in the veins that
in the organs, materials needed by the cells pass out of the blood
and materials produced by the cells pass into the blood.
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Outcomes Most students should be able to: describe double
circulation in humans describe the action of the heart and the
functions of the different blood vessels associated with it. Some
students should also be able to: explain the benefits of a double
circulation.
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Specification The circulatory system transports substances
around the body. [B3.2.1 a)] The heart is an organ and pumps blood
around the body. Much of the wall of the heart is made from muscle
tissue. [B3.2.1 b)] There are four main chambers (right and left
atria and ventricles) of the heart. [B3.2.1 c)] Blood enters the
atria of the heart. The atria contract and force blood into the
ventricles. The ventricles contract and force blood out of the
heart. Valves in the heart ensure that blood flows in the correct
direction. Blood flows from the heart to the organs through the
arteries and returns through the veins. There are two separate
circulation systems, one for the lungs and one for all other organs
of the body. [B3.2.1 d)]
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Workbook Homework Questions on p. 109 - 110
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Human circulatory system A circulatory system consists of a
group of organs that assist the movement of substances, such as
oxygen and glucose, around the body. Humans and other complex
organisms have a closed circulatory system where blood is contained
within a series of vessels. This allows the speed, pressure and
distribution of blood to be controlled.
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Why do you need a Circulatory System? There are billions of
cells in your body and most of them are too far away from a direct
source of food or oxygen A transport system is vital to supply the
needs of your body cells and remove the waste materials they
produce This is the function of your blood circulation system. It
has three main parts: The Blood Vessels The Heart The Blood
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Double Circulatory System
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Write this in your notes Humans have two transport systems,
called a double circulation. One carries blood from your heart to
your lungs and back. This allows oxygen and carbon dioxide to be
exchanged with the air in your lungs. The other carries blood
around the rest of your body and back again to the heart.
Slide 12
Video on following slide The American man on the video
pronounces the word capillaries incorrectly. Its not his fault. He
cant help it. Click below to listen to how to say it: incorrectly
and correctly
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Slide 14
What are the stages in the cardiac cycle?
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Diagram of a Heart
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Worksheet Get an unlabelled Heart Structure worksheet from the
front and add the labels to it using your textbook p.235. Shade the
left (right anatomically) side blue and the right (left
anatomically) side red. Stick in the smaller information sheet
below it, which looks like the one to the right:
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1 2 3 4 5 6 7 8 9 10
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Starter remember its drawn as if its in your chest when you
hold it up Add these labels to the correct numbers Left atrium
Right atrium Left ventricle Right ventricle Pulmonary artery
Pulmonary vein Aorta Vena cava Cardiac muscle Using washable pen
add the following to the heart diagram; Blue arrows to show where
deoxygenated blood flows Red arrows for oxygenated flow
Safety Apron Safety specs Cover cuts No chewing Care with sharp
instruments Wash hands with soap at end
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Heart Dissection 1.Identify the ventricles, atria, aorta,
pulmonary artery, coronary arteries, and fat on the top of the
heart 2.Work out which is the right ventricle (how?) 3.Cut through
the wall of the right atrium with a pair of scissors to expose the
inside 4.Note the thin wall and the hole at the bottom leading to
the right ventricle 5.Cut through the wall of this and follow it
down as it curves around the heart 6.Open the heart from the side.
Look at the tendons attached to the valves 7.Look at the muscular
right ventricle wall and using a seeker or your finger show where
it exits (the pulmonary artery) 8.Repeat the above with the left
atrium and ventricle 9.Find where the left ventricle exits to the
aorta. 10.Cut through the aorta to expose the semilunar valves,
notice the thickness and elasticity of the aorta. 11.Try to
identify the coronary artery running back into the heart muscle by
lifting the semilunar valves with the seeker. 12.Finally try and
expose the semilunar valves in the pulmonary artery.
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artery atrium ventricle fat Coronary artery
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Left atrium Aorta Valve (atrioventricular) Valve (semi lunar)
Tendon (heart string ) Left ventricle Cardiac muscle
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Slide 27
Plenary How many of the labels did we see? Did we see anything
else not labelled?
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Extension - Questions 1.Name the system which transports things
around our bodies. 2.Is the heart a tissue or an organ? 3.What is
the heart made from (mostly)? 4.How many chambers in a heart?
5.What type of blood vessel brings blood to the heart? 6.Which
chamber does blood enter first? 7.How is blood moved to the
ventricles? 8.Why doesnt blood flow back to the atria? 9.Where does
the blood go when the ventricles contract?
Slide 29
Specification The circulatory system transports substances
around the body. [B3.2.1 a)] The heart is an organ and pumps blood
around the body. Much of the wall of the heart is made from muscle
tissue. [B3.2.1 b)] There are four main chambers (right and left
atria and ventricles) of the heart. [B3.2.1 c)] Blood enters the
atria of the heart. The atria contract and force blood into the
ventricles. The ventricles contract and force blood out of the
heart. Valves in the heart ensure that blood flows in the correct
direction. Blood flows from the heart to the organs through the
arteries and returns through the veins. There are two separate
circulation systems, one for the lungs and one for all other organs
of the body. [B3.2.1 d)]