Histology Final Flashcards
expulsion of materials out of the cell
by fusing of a vesicle membrane with the cell
membrane
Exocytosis
uptake of materials into the cell
Endocytosis
Cell drinking
Pinocytosis
Cell eating
Phagocytosis
Composed of a phospholipid bilayer and proteins
Cell membrane
act as diffusion regulators.
phospholipids
Clear liquid enclosed in the cell by the cell’s membrane.
Cytoplasm / cytosol
are metabolically active specialized structures within the cell
Organelles
Largest, densest organelle
Nucleus
Present in all cells except mature red blood cells and blood platelets.
Nucleus
Form of DNA
Chromatin
a double layered membrane
Nuclear envelope
consists of parallel membrane-bound channels.
Endoplasmic Reticulum
“highway system for the cell”
Endoplasmic Reticulum
Primary function: modification, storage,
segregation and transport of proteins that the cell manufactures.
Endoplasmic Reticulum
This organelle can be classified as rough or smooth.
Endoplasmic Reticulum
Contains ribosomes on its outer surface
Rough ER
particles composed of protein and RNA, which synthesize protein
Ribosomes
“protein factories”
Ribosomes
Contains enzymesinvolved inmanufacturing
various lipid molecules and steroid hormones
Smooth ER
“Chemical processing and packaging center
Golgi apparatus
Second largest organelle
Golgi apparatus
Function: sorts, condenses, packages, and delivers proteins from the RER.
Golgi apparatus
“Powerhouse of the cell”
Mitochondria
Releases energy from food molecules and transform energy into ATP
Mitochondria
“Sewer system” of the cell
Lysosome
Membranous sacks produced by the Golgi
Apparatus
Lysosomes
Delicate, threadlike, microscopic structures of
specialized protein, arranged in meshwork of bundles.
Microfilaments
Responsible for cell motility
Microfilaments
Long slender tubes that maintain the shape of
the cell.
Microtubules
Various types of thicker, threadlike microscopic structures within the cell.
Intermediate filaments
Metabolically inert substances that are transient over time in the cell
Inclusions
Closes intercellular space between cells by fusing cell membranes together & prevents the movement or loss of fluid.
Tight junction
Bind cells together by creating “spot welds”
between adjacent membranes.
Desmosomes
Attachment of cell to an adjacent non-cellular surface.
Hemidesmosomes
This junction allows gingival tissue to adhere to the tooth surface by epithelial attachment
Hemidesmosomes
Form tubular channels between
cells that allow substances to be exchanged
Gap junctions
LIFE CYCLE OF A CELL
- Interphase (DNA replication)
- Mitosis (Cell Division)
- Cytokinesis (Cytoplasmic Division)
- Differentiation
Stage in the life cycle when a cell grows and forms new organelles.
• Period of growth and activity between mitoses.
• Consists of 3 phases:
– G1 phase: the initial resting phase of cell growth.
– S phase: DNA replication (chromatin and
centrosome replication)
– G2 phase: the second resting phase of cell
growth.
Interphase
Interphase
The stages of mitosis include:
- Prophase
- Metaphase
- Anaphase
- Telophase
Prophase
What stage?
The nuclear membrane and nucleolus disappear
- Prophase
- Metaphase
- Anaphase
- Telophase
- Prophase
What phase?
Chromosomes become arranged midway between the centrioles.
- Prophase
- Metaphase
- Anaphase
- Telophase
Metaphase
Metaphase
Anaphase
Chromatids migrate to opposite poles by the
mitotic spindle
Anaphase
Telephase
Process by which all cytoplasmic components of the cell are divided into two identical daughter cells following mitosis.
Cytoplasmic division/ cytokinesis
___________ is the process by which a less specialized cell becomes a more specialized cell type
Differentiation
3 periods of prenatal development
- Preimplant period 1st trimester
- Embryonic period 1st
- Fetal period 2nd & 3rd trimester