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LIMITS TO SIZE
Volume Volume determines the amount metabolism in the cytoplasm Metabolism will require import of precursors Metabolism will result in the export of secretions And the export of excretory products © 2010 Paul Billiet ODWSODWS
Surface area Surface area will determine the exchange of materials between the cell and its environment Bigger cells will metabolise more But they will need more surface to support that metabolism And the sites of metabolism in bigger cells will be further from the surface of the cell © 2010 Paul Billiet ODWSODWS
Growing cells 1µm 2µm 3µm 4µm 5µm 6µm © 2010 Paul Billiet ODWSODWS
How are surface area and volume affected by growth? SA/V Volume / µm 3 Surface area / µm 2 Size / µm © 2010 Paul Billiet ODWSODWS
Comparing Surface Area and Volume changes © 2010 Paul Billiet ODWSODWS
Surface Area:Volume Ratio © 2010 Paul Billiet ODWSODWS
Solving the problem Bigger cells have a greater metabolism than smaller cells BUT bigger cells have a proportionally less surface for exchange How to increase surface area with increasing size? © 2010 Paul Billiet ODWSODWS
Throw out extensions Microvilli of small intestine epithelium Image Credit
Flatten into a thin film Chick blastodisc Image Credits
Divide the cytoplasm into smaller volumes Early human embryos Zygote 8-cell Embryo Image Credit Image Credit
Multicellular organisms show the same adaptations Flowering plants have an extensive, branched rooting system to absorb water and minerals Image Credit
Multicellular organisms show the same adaptations Mammals have a long small intestine with internal folding to absorb digested food Image Credit C. Candalh, INSERM
CELL DIVISION © 2006 Mesoblast Limited © 2007 Paul Billiet ODWSODWS.
WHY DO CELLS DIVIDE? ITS ALL ABOUT SIZE WHY DO CELLS DIVIDE? (instead of just getting bigger) 1.Diffusion 2.DNA 3.Surface area-to-volume ratio.
POPULATION GROWTH. What is a population? A group of organism of the same species living in the same habitat at the same time where they can freely interbreed.
What does the city do with wastes?What does the city do with wastes? How does a city get new nutrients?How does a city get new nutrients?
10-1 Cell Growth. Limits To Growth The larger a cell becomes, the more demands the cell places on it DNA and the more trouble the cell has moving enough.
WHEN/WHY DO CELLS DIVIDE?. BIGGER IS NOT BETTER! IMPORTANCE OF CELL MEMBRANE IMPORTANCE OF CELL MEMBRANE –Controls what goes into/out of a cell –All cells.
F211 Exchange and Transport Lungs What do animals need to gain from their environment to stay alive? How do these substances get to cells? What do plants.
Note for C 1.1: Single-celled organisms have all the characteristics of living things.
Transport in Plants Objectives: * Explain the need for transport systems in multicellular plants in terms of size and surface area:volume ratio; **Describe,
Cellular Reproduction. Cellular Growth Cells grow until they reach their size limit, then they either stop growing or divide. A cells size is limited.
Transport in Plants Explain the need for transport systems in multicellular plants in terms of size and surface area:volume ratio; Describe, with the aid.
BIOLOGY TOPIC Outline the wide diversity in the plant kingdom as exemplified by the structural differences between bryophytes, filicinophytes,
Transport in living things Diffusion How are you able to smell various aromas from food? oThe aromas come from vapour from the food. oMolecules.
What makes a Plant a Plant? Plant Characteristics How are Plants Classified.
Transport, Food Storage and Gas Exchange in Flowering Plants Chapter 25.
Homeostasis Glossary Maintain – keep up. Maintain – keep up. Constant – the same. Constant – the same. Internal – inside the body. Internal – inside.
Click on a lesson name to select. Chapter 9 Cellular Reproduction Section 1: Cellular Growth Section 2: Mitosis and Cytokinesis Section 3: Cell Cycle.
Organism–Any living thing 1.Organized–Made of cells A cell is the smallest unit of an organism that carries out all life functions. Each cell has all.
You Are What You Eat. First Things First Suns Energy –Light –Heat Water Minerals.
POPULATIONS. Population - all of the individuals of a species that live together in one place at one time. Demography - the study of human populations.
Population Dynamics The change in the size, density, dispersion, and age distribution of a population in response to changes in environmental conditions.
Cells Units of life The cell is a unit of organization.
THE lac OPERON © 2007 Paul Billiet ODWSODWS. The control of gene expression Each cell in the human contains all the genetic material for the growth and.
Seed Plants The Characteristics of Seed Plants Gymnosperms Angiosperms Plant Responses and Growth Feeding the World Table of Contents.
Fetal Pig Dissection. Respiratory System Trachea Lungs Bronchi Bronchioles Blood vessels alveoli Windpipe; carries air between mouth and lungs.
GAS EXCHANGE IN ANIMALS We will be studying the diversity of adaptations for this process in four animal groups: Mammals Fish BirdsInsects.
Powerpoint Jeopardy Nutrient Knowledge I am nutty for Nutrients Nutrient Nonsense Na Na Nutrients Necessary Nutrients
Introduction to Plants Section 22–1 This section explains what a plant is and describes what plants need to survive. It also explains how the first plants.
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