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Chapter 2: The Cell
n/a
18
Anatomy
Undergraduate 1
09/15/2012

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Term
membrane
Definition
boundary for protection, maintain nutrition/secretion levels, communication cell and outside, eliminate waste, lipid bilayer
Term
nucleus
Definition
two membranes, pores, holds DNA, RNA, and chromatin protein, nucleolus
Term
endoplasmic reticulum
Definition

smooth: membranous tubules, detox poisons, metabolizes lipids and sugars, stores calcium


rough: membranous stacks and ribosomes, start mak protein secretion granules

Term
golgi apparatus
Definition

gets proteins from rough ER, adds sugars, AA residues, lipids,

packages proteins into secretion granules for release (exocytosis), 

packages lysosomal enzymes in lysosomes, which are in cytoplasm to destroy bad or unnecessary things

 

Term
mitochondria
Definition
in plants, make ATP and metabolize lipids
Term
cytoskeleton
Definition
protein in cytoplasm to stabilize membrane structures, support and motion
Term
three types of cytoskeletal elements
Definition

microtubules (Tubulin)

microfilaments (Actin)

intermediate filaments (several proteins)

Term
microvilli
Definition
increase surface area of free cell surfaces[image]
Term
cilia
Definition
move material along cell surface[image]
Term
junctional complexes
Definition
link cells together
Term
three types of endocytosis
Definition

pinocytosis: cell drinking

phagocytosis: cell eating

receptor-mediated endocytosis: bind to specific signal molecule, e.g. hormone

Term
# cells in body
Definition
50 trillion
Term
#cell types in human body
Definition
400
Term
cell junction types
Definition
tight, adhesive belt, button desmosome, gap
Term
tight junction
Definition
keeps unwanted things out
Term
adhesive belt
Definition
many connections, like a zipper
Term
button desmosome
Definition
single point connections, like a snap
Term
gap junction
Definition
simple gap, allows small molecules to pass back and forth
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