Download Ch. 8-3 Cancer and the Cell Cycle

Welcome back to Biology class!
What to expect this semester:
1.
You’re grade starts fresh today! Be proud of your good work from
last semester and make a commitment to work harder in areas that
you have faltered in. You have the power and ability to do as well as
you decide that you can do!
2.
Grading policies will be the same as last semester, however late work
will not be accepted after graded papers have been returned and/or
each Monday when grades are posted in class, whichever comes
first.
3.
You still need to keep an organized binder. You should clear out
your work from last semester (please recycle), but keep using the
same spiral, if you still have room.
Welcome back to Biology class!
Here’s what we’ll cover this semester:
1.
Ch. 8 – Cell division, mitosis, and cancer
2.
Ch. 10, 11, 12 – Genetics, DNA, and genes
3.
Ch. 14, 15 – History of life, fossils, and evolution
4.
Ch. 17 – Classification of life forms
Ch. 8-3 Cancer and the Cell Life Cycle
What we’ll learn:
•What is the normal life cycle of a human cell?
•What is cancer and how is it related to cells?
•What are some causes of cancer in humans?
The “Life Span” of a cell, aka the Cell Cycle
• The cells in your body have a normal life cycle.
• Your cells grow, get older, and may replace
themselves through the process of cell
division.
Cell Division Video
• https://www.youtube.com/watch?v=Q6ucK
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The “Life Span” of a cell, aka the Cell Cycle
• Genes and enzymes in your cells control when
cells go through division.
• Some cells divide often: Skin cells (daily)
Some cells rarely (if ever) divide: Brain cells
Cancer: A mistake in the Cell Cycle
• If a cell continues to rapidly divide and replace
itself without stopping, a tumor may develop.
Cancer: A mistake in the Cell Cycle
• In later stages, cancer
cells enter the circulatory
system and spread
throughout the body, a
process called
metastasis, forming new
tumors that disrupt the
function of organs, organ
systems, and ultimately,
the organism.
The causes of cancer
• Environmental
factors, such as
cigarette smoke, air
and water pollution,
and exposure to
ultraviolet radiation
from the sun, are all
known to damage the
genes that control the
cell cycle.
The causes of cancer
• Cancer may also be
caused by viral
infections that damage
the genes.
• Cancer is also caused
by mutations that
change the function of
DNA and genes.
Treatments for cancer
• Radiation- a targeted
stream of radiation that
damages the genes that
allow the cells to divide.
• Chemotherapy- drugs
that target and destroy
cancer cells.
What is Cancer?
Why haven’t we cured cancer?
Question 1
Explain cancer in terms of cell growth.
Question 1
Explain cancer in terms of cell growth.
Answer
Cancer is a malignant (harmful) growth
resulting from uncontrolled cell division.
The loss of control may be caused by
environmental factors, like UV radiation, or
mutations to DNA and genes.
Problem Solving Lab
• Get Whale Book and a Calculator.
• Open to page 212 .
• Answer questions in the “Do You Know”
Section of your spiral. Title it “Cancer
Problem Solving Lab”. Answer questions
#1-4.
Answer to # 1
The most common type of cancer is Skin:
basal cell and squamous.
The least common type of cancer is Skin:
melanoma
Answer to #2
• Least treatable: Lung
• Most treatable: Skin: basal cell and
squamous.
Answer to #3
• Percent survival for breast cancer:
180,000 cases – 40,000 deaths =
140,000 survivors
140,000 survivors / 180,000 total cases =
0.78 x 100 = 78%
Answer to #4
• Add total number of cancer cases =
1,605,000
• Number of lung cancer = 170,000
• 170,000 / 1,605,000 = .10 x 100 = 10%