Module 1: Chapter 19 Cancer Developement Flashcards
(126 cards)
1What is cancer?
2also called malignancy , is a type of abnormal cell growth in
which cellular regulation is lost, resulting in new tissues that serve no
useful function, are harmful to the function of normal cells and organs,
and can lead to death if left untreated.
How does risk for cancers differs for each adult?
differs by genetic, immunologic, and environmental factors.
What is Celluar Regualtion ?
Cellular regulation
is the genetic and physiologic processes that control cellular growth,
replication, differentiation, and function to maintain homeostasis. All steps
in the processes of cellular regulation are the result of gene interactions
What tissue continues to grow in the body?
Tissues that continue to grow by undergoing mitosis in adulthood include
cells of the skin, hair, mucous membranes, bone marrow, and linings of
organs such as the lungs, stomach, intestines, bladder, breast ducts, and
uterus. These tissues are located in areas in which constant damage or
wear is likely and continued cell growth is needed to replace dead tissues.
What is Neoplasia?
Any new or continued cell growth not needed for normal development
or replacement of dead and damaged tissues is called neoplasia. This cell
growth is abnormal even if it causes no harm (is benign).
Biology of Normal Cells?
Specific morphology is the feature in which each normal cell type has a
distinct and recognizable appearance, size, and shape
Differentiated Function of a normal cells
Differentiated function means that every normal cell has at least one
function it performs to contribute to whole-body function. For example,
skin cells make keratin, liver cells make bile, cardiac muscle cells contract,
and red blood cells make hemoglobin
What is tight adherence?
Tight adherence occurs because normal cells make sticky cell adhesion
molecules (CAMs) that protrude from the membranes, allowing cells to
bind closely and tightly together.
Do RBC produce tight adherence ?
Red blood cells and white blood cells produce no
CAMs and do not usually adhere together.
Nonmigratory on normal cells
Nonmigratory means that normal cells do not wander throughout the
body (except for blood cells). Normal cells are nonmigratory because they
are tightly bound together with CAMs, which prevents cells from
wandering from one tissue into the next.
What are important features of normal cells?
- Orderly and well-regulated growth by cellular regulation is a very important feature of normal cells.
- They divide (undergo mitosis) for only
two reasons: (1) to develop normal tissue or (2) to replace lost, damaged,
or aged normal tissue.
Why are cells termed the name G, 0 ?
-Living cells not actively reproducing are in reproductive resting state.
-During G, 0 period, cells actively carry out their functions but do not divide.
- Normal cells spend most of their lives in the G, O state rather than the reproductive state.
What is contact inhibition ?
Contact inhibition is the part of cellular regulation that stops further
rounds of cell division when the dividing cell is completely surrounded
and touched (contacted) by other cells.
What is Apoptosis ?
Apoptosis is programmed cell death.
What is Euploidy ?
Euploidy, having a complete set of chromosomes, is a feature of most
normal human cells.
What is the correct number of chromosomes for humans ?
23 pairs of chromosomes
Characteristics of a Normal Cell
-Cell division: none or slow
-Appearance : Specific morphologic feature
-Small nuclear to cytoplasmic ratio
-many differentiated cell function
-tight adherence
-no migratory
-well-regulated growth
Diploid ( euploid) chromosome
-low index mitotic index
Characteristics of Benign Tumor Cell
- Continuous or innappropriate cell division
-Specific morphologic features - Smaller nuclear to cytoplasmic ratio
- Many different function
- tight adherence
- no migratory
- Expansion growth
-Diploid ( Euloid) - Low mitotic index
Characteristics of Malignant Cell
Rapid and continious
-Anaplastic appearance
-Larger ratio
-some or none diff funct
-loose adherence
-yes migratory
- invasion growth
-Aneuploid chromosomes
- High mitotic index
What alters body cells?
Body cells are exposed to a variety of conditions that can alter how cells
grow or function. When either cell growth or cell function is changed, the
cells are considered abnormal.
What are Benign Tumor Cells
Benign tumor cells are normal cells growing in the wrong place or at the wrong time as a result of a problem with cellular regulation.
- Examples include moles, uterine fibroid tumors, skin tags, endometriosis, and nasal polyps. Benign tumor cells have these characteristics:
Feature of Benign Tumor
Specific morphology occurs with benign tumors. They look like the
tissues they come from, retaining the specific morphology of
parent cells.
* A smaller nuclear-to-cytoplasmic ratio is a feature of benign tumors
just like completely normal cells.
* Specific differentiated functions continue to be performed by benign
tumors. For example, in endometriosis, a type of benign tumor, the
normal lining of the uterus (endometrium) grows in an abnormal
place (e.g., on an ovary or elsewhere in the abdominal or even the
chest cavity). This displaced endometrium acts just like normal
endometrium by changing each month under the influence of
estrogen. When the hormone level drops and the normal
endometrium sheds from the uterus, the displaced endometrium,
wherever it is, also sheds.
Benign Tumor Cells Features
Tight adherence of benign tumor cells to one another occurs because
they continue to make cell adhesion molecules.
* No migration or wandering of benign tissues occurs because they
remain tightly bound and do not invade other body tissues.
* Orderly growth with normal growth paerns occurs in benign
tumor cells even though their growth is not needed. The fact that
growth continues beyond an appropriate time or occurs in the
wrong place indicates some problem with cellular regulation , but
the rate of growth is normal. The benign tumor grows by
expansion. It does not invade.
* Euploidy (normal chromosomes) are usually found in benign tumor
cells, with a few exceptions. Most of these cells have 23 pairs of
chromosomes, the correct number for humans.
Features of Cancer Cells
Cancer (malignant) cells are abnormal, serve no useful function, and are harmful to normal body tissues