How can we help?

You can also find more resources in our Help Center.

44 terms

Cytology, 5/21-5/23

Dr Kim
STUDY
PLAY
Cytology
the study of cells
cells
-basic units of life
-have all characteristics of life (metabolizes, eats, reproduces
-can live independently of other cells (bacteria, amoeba)
Microscopes
1. compound light-magnify up to 1,000 times, has 2 lenses and uses visible light
2. transmission electron-uses an electron beam in place of light, magnifies up to 1 million times
3. scanning electron-magnifies 100,000 times, gives a 3-D view (Dr Kim's favorite kind)
Plasma Membrane
a thin membrane around the cytoplasm of a cell:
-bilayer structure: phospholipids, cholesterol (strengthens membrane ), proteins (transports)
organelle
a tiny cell structure that carries out a specific function within the cell
Nucleus
Largest of the organelles, contains chromosomes
-chromosomes in the nucleus produce RNA, governs all cellular activities
Nucleolus
structure inside the nucleus, where ribosomes are made
Cytoplasm
material that fills the cell from the nuclear membrane to the plasma membrane. regulates what enters and exits a cell.
Cytosol
liquid part of the cytoplasm. a suspension of nutrients, minerals and enzymes in water
Endoplasmic Reticulum
a cell structure that forms a maze of passageways in which proteins and other materials are carried from one part of the cell to another
(rough ER=ribosomes on surface)
(smooth ER=involved with synthesis of lipids)
ribosomes
where proteins are made
mitochondria
powerhouse of the cell, produces energy (ATP) from oxygen and sugar(Cellular respiration)
Golgi apparatus
A system of membranes that modifies and packages proteins for export by the cell
Lysosomes
digestive enzymes that remove waste
Peroxisomes
organelles that destroy harmful substances that have entered cells
Vesicles
move materials in and out of cells
centrioles
organize and divide cell contents during cell division.
Give support, structure, give nutrients and movement, Provide shape.
flagellum-surface organelle
a lash-like appendage used for locomotion (e.g., in sperm cells and some bacteria and protozoa)
cilia-surface organelle
The hairlike projections on the outside of cells that move in a wavelike manner creating movement of fluids around a cell
Protein Synthesis
cellular substances that direct the production of proteins.
DNA-chromosomes and genes
DNA
deoxyribonucleic acid, the material that contains the information that determines inherited characteristics.
Contains Adenine, Thymine, Guanine and Cytosine
RNA
A type of nucleic acid consisting of nucleotide monomers with a ribose sugar and the nitrogenous bases adenine (A), cytosine (C), guanine (G), and uracil (U); usually single-stranded; functions in protein synthesis and as the genome of some viruses.
Meiosis
(genetics) cell division that produces reproductive cells in sexually reproducing organisms
Mitosis
, a process of cell division that forms two new nuclei, each of which has the same number of chromosomes
Prophase
first and longest phase of mitosis, during which the chromosomes become visible and the centrioles separate and take up positions on the opposite sides of the nucleus
Metaphase
second phase of mitosis, during which the chromosomes line up across the center of the cell
Anaphase
the third phase of mitosis, during which the chromosome pairs separate and move toward opposite poles
Telephase
4th phase of cell division. the chromosomes become longer, thinner, and less distinct. the nucleur membrane forms. the neocleolus reappears and cell division is nearly complete
cytokinesis
organic process consisting of the division of the cytoplasm of a cell following karyokinesis bringing about the separation into two daughter cells
diffusion
process by which molecules tend to move from an area where they are more concentrated to an area where they are less concentrated.
-does not use energy
Osmosis
diffusion of molecules through a semipermeable membrane from a place of higher concentration to a place of lower concentration until the concentration on both sides is equal
-does not use energy
Filtration
movement of materials through a membrane under mechanical force
-does not use energy
endocytosis
the process by which a cell membrane surrounds a particle and encloses the particle in a vesicle to bring the particle into the cell (requires cellular energy)
Phagocytes
white blood cells that digest & destroy microorgasims and other unwanted substances - part of immunity system
Pinocytosis
process by which certain cells can engulf and incorporate droplets of fluid
Active Transport
the movement of materials through a cell membrane using energy
Exocytosis
process by which a cell releases large amounts of material
isotonic
having the same or equal concentration as cytoplasm (IV fluids)
hypotonic
less concentrated than intracellular fluid
hemolysis
red blood cells swell and burst (hypotonic)
hypertonic
more concentrated than intracellular fluid
crenation
in animal cells, shriveling of the cell due to water leaving the cell when the environment is hypertonic
mutation
any event that changes genetic structure
Cancer risk factors
-heredity
-chemicals
ionizing radiation
-physical irritation
-diet
-viruses