HUMAN REPRODUCTION L1 Flashcards
what are the symptoms of amoebiasis?
Abdominal cramps
* Diarrhea
* Fatigue
* Excess gas
* Rectal pain while having bowel movement
* Unintentional weight loss
A cell that has a nucleus
eukaryotic
what causes amoebiasis
a single celled parasite called ENTAMOEBA HISTOLYTICA
Reproduces through binary fission (ASEXUAL REPRODUCTION)
entamoebe histolytica
or prokaryotic cell
where does the parasite entamoeba histolytica live
in the gut of infected people
where can entamoebe histolytica pass through
water and feces
how long can entamoeba histolytica live
weeks (sometimes even months) in soil, fertilizer, or water contaminated with infected feces
what can entamoeba histolytica do
Can cause inflammation of the lining of your intestines
what are the symptoms of the invation of your bloodstreams and liver
(symptoms: upper abdominal pain, your skin and the whites of your eyes become yellow, your liver becomes enlarged)
what are the symptoms of the inflammation of the intestines
(symptoms: abdominal pain, diarrhea, high temperature fever)
Asexual reproduction (no sex cells involved, only the separation of the body into two new bodies. what is this?
binary fission
how can you get amoebiasis?
When you drink water contaminated by infected feces
* When you eat food prepared or washed using contaminated
water
* When you don’t wash your hands
* Sexual transmission is also possible (especially in men who have sex with men, ANAL SEX)
what is the treatment of amoebiasis?
- Medication to kill the parasite
- Drinking plenty of fluids to prevent dehydration due to diarrhea
what are the 2 types of cells?
prokaryotic and eukaryotic cells
Cells with true nucleus
Nucleus is membrane-bound containing multiple chromatin
eukaryotic cell
Common unit of measure in the study of cells:
micrometer (1 um =
1/1,000,000 meter
Cells without a true nucleus
“Nucleoid” contains single chromosome
prokaryotic cell
what is the smallest cell
a bacterium called mycoplasma gallicepticum. 0.0001 mm.
who were the 3 German scientist that formed the cell theory?
- theodor schwann
- matthias schleiden
- rudolph virchow
what are the 6 cell theories?
- all cells came from pre existing cells
- all living organisms are made up of cells
- cells are the basic unit of life
- hereditary information is passed from one cell to another during cell division
- All cells are the same in chemical composition in organisms of similar species
- energy flows occurs within cells
The “skin” of the cell
Cell/Plasma membrane
Contains the organelles; where most cellular activities take place
cytoplasm
A living double layer of proteins and carbohydrates
cell membrane
Contains the genetic material (DNA)
nucleus
Separates the cell membrane from its external environment
cell membrane
Regulates the entry and exit of materials in the cell
cell membrane
Regulates the entry and exit of materials in the cell
cell membrane
Protein factories of the cell: spherical bodies that produce and assemble proteins
ribosome
May be found individually in the cytoplasm or line the membranes of the endoplasmic reticulum
ribosome
Membrane-enclosed spaces for storage of materials such as food, water, sugar, minerals, and waste products
vacuole
Double-membrane organelles, with a smooth outer membrane and folded inner membrane As the “powerhouse” of the cell
mitochondria
it is the site of cellular aerobic respiration breaking down of food molecules and turning it into energy that cells can use in order to perform life functions)
mitochondria
are numerous and short; flagella are few
cilia
Hair-like organelles used
cilia and flagella
Why do cells divide? may 3 give 1
- Growth and Development: organisms grow not because cells are getting larger, but because cells are dividing to produce more and more cells
- Repair of damaged body parts: replacing old, dead, or damaged cells
- Production of reproductive cells
for locomotion of the cell
figalus
How do cells know when to divide?
Using chemical signals from special proteins called cyclins
V Cyclins tell cells when to start dividing and later when to stop dividing
10 cells in the human body
pancreas, bone, blood, lung, egg, bone, kidney, muscle, brain, liver
when a cell cannot stop dividing
cancer
we lose how many dead skins every minute?
30,000 to 40,000
Two stages of cell cycle
interphase, cell division
non-dividing stage of the cell
interphase
A cycle of alternating stages of division and rest from division of a cell
Cell Cycle
dividing stage of the cell
cell division
interphase stage for for DNA replication
S
what are the 3 stages of interphase
*G1 - for growth and normal metabolic roles
*S - for DNA replication
*G2 -for growth and preparation for mitosis
*Longest stage of the cell cycle
* Devoted for cell growth
* Cell s metabolically active
* Nutrition
* Respiration
* Biosynthesis
Interphase