05.04.2020 – Monday –
Science –
Remember to copy the notes
in your notebook and define CAPITALIZED terms.
I. Current Events: Link to CNN - https://www.cnn.com/cnn10
A. Two notes on Invasive “Murder Hornets.”
…
B. Like honeybees haven’t had it hard
enough lately. We’ve studied how pesticides, and other stresses, have caused a
decline in bee populations. Honeybees are important for the POLLINATION of
crops all over the world.
1. One of the biggest reasons for species
extinction is INVASIVE SPECIES. (Remember the other reason?) These hornets are an invasive species
and just a few hornets can destroy an entire honeybee hive. Often people call
wasps and hornets “bees,” but they’re very different species.
II.
The
Immune System: There are six types
of PATHOGENS …
a.
Viruses
(Give an example.)
b.
Bacteria
(Give an example.)
c.
Fungi
(Give an example.)
d.
Protozoa
(Give an example.)
e.
Worms
-
f.
Prions
-
III.
We’re
going to focus on those first four.
Worms get their own category because there are so many types that can
cause problems for people and Prions are a recently discovered type of protein
that can cause sickness. We’ve
been studying DNA and today it’s about viruses.
IV. Levels of protection: Sometimes a pathogen gets past the first
couple of layers of protection.
a.
Skin
b.
Mucus
c.
Stomach
acids
V.
If
a pathogen makes it past these, the WHITE BLOOD CELLS are the next line of
defense. They patrol the blood and will kill any pathogen they recognize.
VI. Sometimes a new pathogen,
that isn’t recognized, will enter the blood stream so white blood cells create
ANTIBODIES to fight the infection.
VII.
A
PATHOGEN, like a virus, might not be recognized because it has MUTATED: its DNA
has changed and it can get by our defenses.
VIII.
This
is what has happened with Covid 19. It’s a class of virus we know about, but a
new (novel) virus to our species!
No comments:
Post a Comment
Note: Only a member of this blog may post a comment.