unit 4: summary - mrs. morgan · between living things unit 4: summary. review cell theory • all...
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Similarities and Differences
Between Living Things
Unit 4: Summary
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Review cell theory
• All living things made of cells
• Cells perform life functions
• Cells come from pre existing cells
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What are life functions?
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Metabolism
• Chemical reactions needed to live
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How does an amoeba perform
life functions
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How do multi-celled organisms
perform life functions?
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Work together to help organisms maintain
homeostasis
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Homeostasis = Dynamic
Equilibrium
• Define and draw in your notes
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Homeostasis in cells requires:
• Transport
• Communication
• Feedback mechanisms
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Cell transport
• Passive transport = diffusion
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Diffusion
• Movement from high to low until it is
equal on both sides
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What diffused through our fake
cells in the diffusion through a
membrane lab
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How do we know?
• Water
• Starch indicator (iodine)
• glucose
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What didn’t diffuse through the
dialysis bags and why?
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What can diffuse through cell
membranes
• Water
• O2
• CO2
• alcohol
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Diffusion of water = osmosis
• What happens to a cell in pure water?
• Water moves in cell swells
• What happens to a cell in salt?
• Water moves out cell shrinks
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So how do cells survive in
freshwater ecosystems?
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Active transport
• Moves molecules from low to high
• REQUIRES ENERGY
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Cellular communication
• Chemical messengers and receptor molecules
are very specific because of their shape
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Hormones = chemical messengers of
the endocrine system
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Neurotransmitters = chemical
messengers of nerve cells
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Both bind very specifically to
receptor proteins in cell
membranes
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Feedback mechanisms
maintain homeostasis
• Stimulus = change in environment response
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Example in plants
• Guard cells open and close stomates in leaves
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• Response = stomates close less transpriation
Environment = Hot Dry
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Environment = cool and moist• Response = stomates open more transpiration
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• Body temp controlled by sweating and
shivering
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Ex: Glucose levels controlled by
hormones
• Hi blood glucose pancreas
• insulin decreases blood glucose
• Low glucose pancreas
• another hormone (glucagon) release
of sugar from liver
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Feedback loops maintain
blood glucose
Practice Homeostasis Questions
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Life Functions =
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Movement
• helps us respond to the environment
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Respiration
• Release energy from food
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Synthesis
• Making cell parts
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Circulation
• Transport food and wastes within organisms
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Excretion• Waste removal
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Digestion
• lysis = breakdown
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Immunity • Protect against invaders
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Coordination and regulation
• Communication and control
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Reproduction• DNA replicates new cells
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Organelles life functions
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Body systems life functions
Multi-celled organisms only
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Life function chart
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Movement
• Purpose
• Helps living things respond to environment
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Skeletal muscle system
• Bones connected by ligaments
• Muscles connected by tendons
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Respiration
• Purpose:
– Release energy from food
• Types:
– Aerobic = with O2
– Anaerobic = absence of O2
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Mitochondria
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Respiration requires gas
exchange =Respiratory system
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Synthesis• Purpose
– Make things
• Examples:– photosynthesis
– Protein synthesis
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Chloroplasts absorb sunlight
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Ribosomes protein synthesis
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Circulation
Purpose =
• Transport of materials within an organism
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2 types of transport tissues in
plants
• Xylem = carries water and nutrients up to leaves
•Phloem = carries sugar down to roots
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Circulation in plants
http://library.thinkquest.org/05aug/01883/introtocircman.gif http://www.forestry.ky.gov/NR/rdonlyres/A0426C07-17B9-4581-9309-9594684281C6/0/partsofatree.jpg
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Human Circulatory System
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Heart pumps blood through
arteries, veins and capillaries
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Lymphatic System
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Excretion
Purpose:
• Removal of cellular wastes
• Wastes include:
– CO2, H2O,
– heat, nitrogen wastes urine and
sweat
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Organelle
Cell membrane
Water
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Excretory system
Kidneys filter
blood urine
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Digestion
Function
• Lysis = break down– Complex sugars simple sugars
– Proteins amino acids
– Fats fatty acids
Body system • digestive system (lots of enzymes)
– Organs (mouth, stomach, intestines)
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Digestive system
http://www.nlm.nih.gov/medlineplus/ency/images/ency/fullsize/1090.jpg
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Digestive system
• Chemical digestion
– (enzymes and acids)
• Mechanical
– Chewing and churning
http://www.nlm.nih.gov/medlineplus/ency/images/ency/fullsize/1090.jpg
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Immunity
Purpose
• Prevent disease and kill pathogens
• Pathogens = disease causing organisms
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Organelle = Cell membrane
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Body system = immune system
• White blood cells travel in blood and
lymph
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http://static.howstuffworks.com/gif/adam/images/en/white-blood-cell-count-results-picture.jpg
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Coordination and regulation
Purpose• Control life functions
• communication
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Organelle = Nucleus
• Nucleus
– DNA heredity
– DNA enzymes chemical reactions
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Nervous system
• Organs = brain and spinal chord
• Cells = nerve cells
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Endocrine system
Organs =
• glands release chemical messengers
• Called hormones
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Reproduction
Purpose: • Necessary for the continuation of life
• 2 types
• Asexual genetically identical offspring
• Sexual diversity
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Organelle = nucleus
DNA replicates and cells split
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Reproductive system
• Organs– Females = ovaries eggs
– Males = testes sperm
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Advantage of Sexual reproduction
increased diversity
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MRS. CEDICR
• Movement
• Respiration
• Synthesis
• Circulation
• Excretion
• Digestion
• Immunity
• Coordination and regulation
• reproduction
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Cells and Tissues
• https://www.youtube.com/watch?v=7bD
pYZsC8mQ
• Tissue rap
http://www.teachertube.com/video/4-
types-of-tissues-rap-464117