1 Anatomy & Physiology of Cells Chapters 3 & 4 Anatomy & Physiology.
BIO 099 Biology Review Cell Anatomy & Physiology.
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Transcript of BIO 099 Biology Review Cell Anatomy & Physiology.
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BIO 099 Biology Review
Cell Anatomy & Physiology
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Copyright © 2009 Pearson Education, Inc., publishing as Pearson Benjamin Cummings
An Introduction to Cells
Cell Theory Developed from Robert Hooke’s research
Cells are the building blocks of all plants and
animals
All cells come from the division of preexisting cells
Cells are the smallest units that perform all vital
physiological functions
Each cell maintains homeostasis at the cellular
level
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A Review of Cells
Cell surrounded by a watery medium
known as the extracellular fluid
(interstitial fluid)
Plasma membrane separates cytoplasm
from the ECF
Cytoplasm - Cytosol = liquid
-contains organelles
BioFlix Tour of Animal Cell
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Organelles and the Cytoplasm
Cytosol (fluid) Dissolved materials:
– nutrients, ions, proteins, and waste products
High potassium/low sodium High protein High carbohydrate/low amino acid and fat
Organelles Structures with specific functions
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Organelles Review
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Organelles Review
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Mitochondria
Aerobic metabolism (cellular respiration)
Mitochondria use O2 to break down food and produce ATP
G + O2 + ADP CO2 + H2O + ATP
Glycolysis:
glucose to pyruvic acidnet gain 2 ATP when anaerobic= lactic acid
Transition Reaction: pyruvic acid to acetyl Co-A
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Mitochondria
Aerobic metabolism (cellular respiration)
Mitochondria use O2 to break down food and produce ATP
G + O2 + ADP CO2 + H2O + ATP
Tricarboxylic acid cycle (TCA or Krebs cycle):
– Acetyl CoA to CO2 (in matrix) & reduced
coenzymes
Electron transport chain– inner mitochondrial membrane
H+ ions used to make ATPCopyright © 2009 Pearson Education, Inc., publishing as Pearson Benjamin Cummings
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The Nucleus
DNA Instructions for every protein in
the body
Gene DNA instructions for one protein
Genetic code The chemical language of DNA
instructions:– sequence of bases (A, T, C, G)
Triplet code:– 3 bases = 1 amino acid
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Cell Differentiation
All cells carry complete DNA instructions for all body functions
Cells specialize or differentiate To form tissues (liver cells, fat cells, and neurons)
By turning off all genes not needed by that cell
All body cells, except sex cells, contain the same 46 chromosomes
Differentiation depends on which genes are active and which are inactive
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Protein Synthesis
The Role of Gene Activation in Protein
Synthesis
The nucleus contains chromosomes
Chromosomes contain DNA
DNA stores genetic instructions for proteins
Proteins determine cell structure and function
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Protein Synthesis
Transcription
Copies instructions from DNA to mRNA (in nucleus)
Translation
Ribosome reads code from mRNA (in cytoplasm)
Assembles amino acids into polypeptide chain
Processing
By RER and Golgi apparatus produce protein
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Functions of the Plasma Membrane
Physical Barrier
Regulates exchange Ions and nutrients enter
Wastes eliminated and cellular products released
Monitors the environment Extracellular fluid
composition
Chemical signals
Structural support Anchors cells and tissues
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Membrane Transport
The plasma (cell) membrane is a barrier, but
Nutrients must get in
Products and wastes must get out
Permeability determines what moves in and out of a
cell, and a membrane that
Lets nothing in or out is impermeable
Lets anything pass is freely permeable
Restricts movement is selectively permeable
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Membrane Transport
Plasma membrane is selectively permeable Allows some materials to move freely Restricts other materials
Selective permeability restricts materials based on Size Electrical charge Molecular shape Lipid solubility
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Membrane Transport
Transport through a plasma membrane can be Active (requiring energy and ATP)
Passive (no energy required)
Diffusion (passive)
Carrier-mediated transport (passive or active)
Vesicular transport (active)
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Diffusion
Diffusion is a Function of the Concentration
Gradient & Kinetic Energy Solutes move down a concentration gradient until?
Factors Affecting Diffusion Distance the particle has to move
Molecule size
Temperature
Gradient size
Electrical forces
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Diffusion
Diffusion Across Plasma Membranes Can be simple or channel mediated
Materials that diffuse through plasma membrane by simple diffusion: Diffusion animation
– lipid-soluble compounds (alcohols, fatty acids, and steroids)
– dissolved gases (oxygen and carbon dioxide)
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Diffusion
Figure 3–15 Diffusion across the Plasma Membrane
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Diffusion
Osmosis: A Special Case of Diffusion Osmosis is the movement of water through
aquaporins More solute molecules, lower concentration of
water molecules
Water molecules diffuse across membrane toward solution with more solutes
More solutes = higher osmolarity
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Diffusion
Osmosis: A Special Case of Diffusion
Osmotic Pressure
Is dependant on osmolarity
Areas with higher osmolarity have OP which pulls
water toward it.
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Diffusion
Osmolarity and Tonicity Isotonic (iso- = same, tonos = tension)
A solution that does not cause osmotic flow of water in or out
of a cell
Hypotonic (hypo- = below) Has less solutes and loses water through osmosis
Hypertonic (hyper- = above) Has more solutes and gains water by osmosis
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Tonicity
A cell in a hypotonic solution:
Gains water Ruptures (hemolysis of red
blood cells)
A cell in a hypertonic solution:
Loses water Shrinks (crenation of red
blood cells)
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Carriers and Vesicles
Carrier-Mediated Transport
Facilitated diffusion Specificity: Saturation limits: Regulation:
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Carriers and Vesicles
Carrier-Mediated Transport
Cotransport
Two substances move in the same direction at the
same time
Countertransport
One substance moves in while another moves out
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Carriers and Vesicles
Carrier-Mediated Transport
Active transport Active transport proteins:
– move substrates against concentration gradient
– require energy, such as ATP
– ion pumps move ions (Na+, K+, Ca2+, Mg2+)
– exchange pump countertransports two ions at the same
time
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Carriers and Vesicles
Active transportSodium-potassium exchange pump
sodium ions (Na+) out, potassium ions (K+) in
-1 ATP moves 3 Na+ and 2 K+
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Carriers and Vesicles
Active transport-
Secondary active transport
– Na+ concentration gradient drives
glucose transport
– ATP energy pumps Na+ back out
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Carriers and Vesicles
Vesicular Transport (or bulk transport)
Materials move into or out of cell in vesicles
Endocytosis (endo- = inside) is active transport using ATP:
– receptor mediated
– pinocytosis
– phagocytosis
Exocytosis (exo- = outside)
– Granules or droplets are released from the cell
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Carriers and Vesicles
Endocytosis
Receptor-mediated endocytosis:
Receptors (glycoproteins) bind target molecules (ligands)
Coated vesicle (endosome) carries ligands and receptors
into the cell
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Carriers and Vesicles
Endocytosis
Pinocytosis
Endosomes “drink” extracellular fluid
Phagocytosis
Pseudopodia (psuedo- = false, pod- = foot)
Engulf large objects in phagosomes
Exocytosis
Is the reverse of endocytosis
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Carriers and Vesicles
Figure 3–22 Phagocytosis.
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Carriers and Vesicles
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Carriers and Vesicles
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Transmembrane Potential
Interior of plasma membrane is slightly negative,
outside is slightly positive
Unequal charge across the plasma membrane is
transmembrane potential or RMP
Resting potential ranges from –10 mV to
–100 mV, depending on cell type RMP animation
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Transmembrane Potential
Determined mainly by the unequal distribution of Na+ & K+
The cell's interior has a greater concent. of K+ and the outside has a greater concent. of Na+
At rest the plasma membrane is relatively impermeable to Na+ and freely permeable to K+
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Transmembrane Potential
The cell has 2 types of channels:
1.) Passive (leaky)
2.) Gated
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Transmembrane Potential
More K diffuses out of the cell than Na diffuses into the cell
Results in a loss of + charges from the cell = negative RMPCell is polarized.
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Transmembrane Potential
If too much K left the cell it would become too negative = hyperpolarize
If Na was allowed to accumulate inside the cell it would become less negative (more positive) or depolarize.
Entrance of Na into the cell would change the tonicity of the cell
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Transmembrane Potential
The Na-K pump functions to maintain the osmotic balance & membrane voltage
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Transmembrane Potential
When stimulus applied:
Gated Na+ channels open = depolarization
Gated K+ channels open so K+ leaves = repolarization
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A Cell’s Life Cycle
Figure 3–23 The Cell Life Cycle.
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A Cell’s Life Cycle
Mitotic Rate and Energy Use
Rate of cell division
Slower mitotic rate means longer cell life
Cell division requires energy (ATP)
Muscle cells, neurons rarely divide
Exposed cells (skin and digestive tract) live only days
or hours
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Regulating the Cell Life Cycle
Normally, cell division balances cell loss
Increased cell division Extracellular chemical factors (growth factors)
Decreased cell division Repressor genes (faulty repressors cause cancers)
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Regulating the Cell Life Cycle
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Tumors and Cancer
Cancer develops in steps
Abnormal cell
Primary tumor
Metastasis
Secondary tumor
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Tumors and Cancer
Tumor (neoplasm) Enlarged mass of cells
Abnormal cell growth and division
Benign tumor Contained
Not life threatening
Malignant tumor Spreads into surrounding tissues (invasion)
Starts new tumors (metastasis)
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Tumors and Cancer
Figure 3–26 The Development of Cancer.