Using the drop-down menus, identify the parts of
the lower respiratory system from the descriptions
below.
are enclosed in a membrane
The
called the pleura.
The
are branch-like extensions
found in the lower respiratory system.
Identify the structures labeled in the diagram to
the right
Label A
In the 1930s, medical journal
articles linked asbestos to cancer.

1. an enzyme is considered a(n) because it speeds up a chemical reaction without being used up.2. in a catalyzed reaction, a reactant is often called a(n) . an enzyme is specific because the shape of its matches only particular reactants.4. an enzyme speeds up reactions by lowering the . the between an active site and its substrate often strains bonds and the reaction proceed.6. a( , which is often a vitamin, binds to an enzyme and plays a role in catalysis.7. high temperatures or changes in ph can an enzyme, causing it to lose its shape and biological activity.