Download 1. Diffusion: The movement of particles of a fluid from a high

How are molecules transported?
•
Organ systems work together to transport and use molecules in plants and
animals.
•
The circulatory system transports molecules in the blood of animals.
•
Xylem and phloem vessels transport water and sugars in plants.
Key words:
1. Diffusion: The movement of particles of a fluid from a high concentration to a low
concentration, down the concentration gradient.
2. Osmosis: The movement of water form an area of low concentration of solutes to an area of
high concentration of solutes, across a partially permeable membrane.
3. Active Transport: The movement of particles of a fluid from a low concentration to a high
concentration, up the concentration gradient. This requires energy.
4. Mass Transport: The movement of large amounts of molecules around a whole organism.
5. Key Nutrients: Glucose, Carbon Dioxide, Oxygen, Amino Acids, Fatty Acids
6. Heart: An organ that pumps blood around the body, and nutrients with it.
7. Blood vessels: Arteries, veins and capillaries, these carry blood.
8. Heart Disease: A condition where the coronary arteries can become clogged. Can lead to heart
attacks if not treated.
9. Vascular Tissue: Xylem and phloem cells, used in plants to transport water and sugars.
What are the
components of blood?
•
Blood has four main
parts: Red and
white blood cells,
platelets and
plasma.
•
Red blood cells
carry oxygen and
carbon dioxide.
•
White blood cells
fight pathogens.
•
Platelets cause
clots and scabs for
protection.
•
Plasma contains the
rest and carries
other nutrients.
•
•
•
Arteries – blood vessels that
carry blood Away from the
heart. They have thick muscular
walls to withstand high
pressure.
Veins – blood vessels that carry
blood IN to the heart. Veins
have valves. They have thinner
muscular walls since the
pressure isn’t very high.
Capillaries – small blood vessels
that carry blood everywhere in
the body where there aren’t
veins or arteries. They have thin
leaky walls for gas exchange.
Year 11 B3 Revision Questions
1. Define diffusion.
2. Define Osmosis.
3. Define active transport.
4. Draw and label the heart.
5. Explain the differences between the three types of blood vessel.
6. Describe the four components of blood.
7. Describe heart disease.
8. Suggest treatments for heart disease.
9. Evaluate a treatment for heart disease.
10.Describe Xylem and phloem cells and state what they transport.
11.Describe the transpiration stream.
12.Describe translocation.