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B2 Topic 1

Topic 2 Digestion

Science B3 Topic 3 Circulation



The Circulatory System

The circulatory system is an example of a group of
organs working together. It is made up of the heart and
blood vessels.


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The Heart

Find out about the structure and function of the heart

Describe what happens
to a volume of blood
from the time it enters
the heart until it is
pumped through the

Describe what happens to a volume of blood from
the time it enters the heart until…

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Blood Vessels
Carry blood away from the heart (always oxygenated apart from the
pulmonary artery which goes to the lungs)
Have thick muscular walls
Have small passageways for blood (internal lumen)
Contain blood under high pressure

Found in the muscles and lungs
Microscopic ­ one cell thick

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Fluid part of blood
Carries carbon dioxide, hormones and waste

Clump together to form clots
Protect the body by stopping bleeding

Red blood cells
Contain haemoglobin which carries oxygen
Made in the bone marrow. The more you train the more red
blood cells are made.

White blood cells…

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The digestive system

Annotated Diagram of the digestive system that includes
· functions of each part e.g. gullet - muscles squeeze
chewed food into the stomach
· How food is processed in the body

Difference between mechanical and chemical digestion

Role of digestive enzymes

Human Digestive System


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As soon as you swallow, you have lost the conscientious
ability to control your food. From this point on it is
'pushed' along the alimentary canal by peristalsis

The bolus is squeezed down the oesophagus (gullet) by
wavelike contractions of the surrounding muscle. This is
called peristalsis.

Digested food…

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Digestive enzymes

Research some digestive enzymes and their functions

Watch the video
Use the information to explain what the diagram shows


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Active Site

Enzymes are protein molecules made up of long chains
of amino acids. These long chains are folded to
produce a special shape called the active site. Other
molecules called substrates fit into the active site
and a reaction takes place.

Explain the effect of temperature on enzyme activity…

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Predict the shape of the graph for enzyme activity and
pH. Include the shape for pepsin.

Write 5 facts about enzymes that you should

· Enzymes are all proteins
· Enzymes are specific (they control one specific reaction)
· They can be used again and again
· They…


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