CHAPTER 2 (PART 2) Flashcards
basic living, structural and functional unit of the body
cell
study of cell structure and cell physiology
cytology
disc shaped cell
Red blood cell
threadlike extension cell
nerve cells
toothpicks shaped cell
smooth muscle cell
cubelike cells
epithelial cell
forms the cell’s outer boundary
cell membrane
separates the cell from the environment
cell membrane
selective barrier that surrounds and contain cytoplasm of the cell
cell membrane
determines the kinds and amount of substances passing into and out of the cell
cell membrane
acts as gatekeepers to certain molecules and ions
proteins
acts as barrier to certain substances
lipids
made up of phospholipids, cholesterol and glycolipids
lipid bilayer
polar heads are __
hydrophilic
Fatty acid and tails of phospholipids are ___
hydrophobic
aka transmembrane proteins
integral proteins
attached to the inner or outer surface of the membrane but do not extend through it
peripheral protein
helps the cell recognize each other, adhere to one another and be protected from digested by enzymes
glycocalyx
membrane proteins with carbohydrate group attached that protrudes into the extracellular fluid
glycoproteins
serves to stabilize the membrane and reduce membrane fluidity
Cholesterol
sugary coating surrounding the membrane made up of carbohydrate
glycocalyx
lipid composition of the cell membrane
membrane fluidity
combined concentration and electrical gradient are called the
electrochemical gradient
all the cellular contents between the plasma membrane and the nucleus
cytoplasm
difference in concentration of a chemical between one side of the plasma membrane
concentration gradient
electrical gradient is aka
membrane potential
difference between inside and outside of cell
electrical gradient
intracellular fluid that contains inclusions and dissolved solutes
cytosol
organized units of living substances in cell having specific functions in the cell
organelles
lifeless accumulation of metabolites or cell products such as stored protein CHON
Inclusions
site of many chemical reactions that provide the building blocks for cell maintenance, structure, function and growth
cytosol
network of protein filaments throughout cytosol
cytoskeleton
composed of actin and function in movement and mechanical support
microfilaments
composed of several different proteins and functions in support and to help anchor organelles such as nucleus
intermediate filaments
composed of protein called tubulin and help determine cell shape and function in the intracellular transport of organelles and the migration of chromosome during cell division
microtubules
network membrane in the shapes of flattened sacs or tubules
endoplasmic reticulum
connected to the nuclear envelope, a series of flattened sacs, surface is studded with granular ribosomes and produces various proteins
rough endoplasmic reticulum
network of membrane tubules, does not have ribosomes, synthesizes fatty acid and steroids, detoxifies certain drugs, produces lipids
smooth endoplasmic reticulum
powerhouse of the cell
mitochondria
mitochondrial membrane that has narrow folds of the inner membrane and use to increase the efficiency of the organelle in generating energy
cristae
mitochondrial membrane that is smooth, outer part and a large fluid like cavity
matrix
site of ATP production in the cell by catabolism of nutrient molecules
mitochondria
vesicles from the golgi complex that contains powerful digestive enzymes
lysosomes
smaller than lysosomes, detoxify several toxic substances such as alcohol and is abundant in liver
peroxisomes
continuously destroy unneeded, damaged or faulty proteins found in the cytosol and in the nucleus
proteosomes
this structure is a specialized portion of endoplasmic reticulum and includes an array of parallel membranes and vesicles w/o ribosomes
Golgi apparatus
discovered golgi apparatus in 1898
Camilo golgi
site of accumulation and concentration of secretory products of cell synthesis
golgi apparatus
modifies, sorts and package proteins for transport to different destinations
golgi complex
dense aggregations of RNA and proteins usually attached in ER
ribosomes
located near the nucleus, consists of two centrioles and pericentriolar material
centrosome
numerous hair-like structure extended from the surface of a cell and functioning to move the materials across surface of the cell
cilia
longer than cilia, used to move an entire cell; sperm
flagella
serves as center for organizing microtubules in the interphase cells and mitotic spindle during cell division
centrioles
special zone of cytoplasm containing centrioles
centrosome
control center of the cell
nucleus
contains chromosomes. each of which consist of single molecule of DNA and associated proteins
nucleus
genetic material; blueprint that contains all the instructions needed for building the body
Deoxyribonucleic acid
controls both biochemical reaction that occurs in the cell and the reproduction of the cell
nucleus
membrane that is composed of 2 layers with a small space between them
nuclear membrane
jelly-like fluid that is enclosed by the nuclear membrane; it is where the nucleoli and chromatin are suspended
nucleoplasma
potential avenues of exchange between the nucleoplasm and the cytoplasm
pores
peacemaker of the cell; site where rRNA is synthesized and ribosome sub units are assembled
nucleolus
consists of segment of a large DNA molecule; units of heredity
Gene
double membrane that separates the nucleus from cytoplasm
nuclear envelope
long molecules of DNA combined with protein molecules (histones)
chromosomes
a complex of macromolecules composed of DNA, RNA and protein
Chromatin
primary protein components of chromatin that help to organize DNA into beadlike structures called nucleosomes by providing a base of which DNA can be wrapped around
Histones
involves transcription and translations; determines physical and chemical characteristics of the cell
protein synthesis
process by which genetic information encoded in DNA is copied onto a strand of RNA
transcription
process of reading the mRNA nucleotide sequence to determine the amino acid sequence of the protein
translation
process by which cells reproduce themselves.
cell division
cell division that results in the production of sperm and eggs is called
reproductive cell division
two chromosomes that make up each pair in cell division
homologous chromosomes (homologs)
cell cycle is an orderly sequence of events in which a body cell duplicates its contents and divides into two
somatic cell division
somatic cells contain two sets of chromosomes are called
diploid cells
cell is not dividing, and cell replicates its DNA
interphase
cytoplasmic division
cytokinesis
nuclear division
mitosis
distribution of two sets of chromosomes, one set into each of two separate nuclei
mitosis
chromatin fibers condenses and shortens, change into chromosomes
prophase
the centromeres line up at the exact center of the mitotic spindle, a region called the metaphase plate or equatorial plane
metaphase
chromatid pairs split at the centromere and move to opposite poles of cell; the chromatids are now called chromosomes
anaphase
two identical nuclei are formed around the identical sets of chromosomes at opposite poles of the cell uncoil and revert to their threadlike chromatin form, new nucleoli appears, and the mitotic spindle eventually breaks up
telophase
reproductive cell division that occurs in the gonads that produces gametes with half the number of the chromosomes
meiosis
gametes contains a single set of 23 chromosomes
haploid cells
average adult has nearly __ cells
100 trillion
there are about __ different types of cells
200
permits organization of cells into more complex tissues and organs
cellular diversity
diseases process that is involving our cells; cancer
homeostatic imbalance
group diseases characterized by uncontrolled cell proliferation
cancer
cells that divide without control develop into a __
tumor or neoplasm
cancer that arise from epithelial cells
carcinoma
cancerous of growth of melanocytes
melanoma
cancer arise from muscle cells or connective tissues
sarcoma
cancer of blood forming organs
leukemia
cancer of lymphatic tissue
lymphoma
process where cancer cells leaves their site of origin and travel to other tissues or organs
metastasis