final review. embryology zygote: fertilized egg gastrulation- endoderm, mesoderm, and ectoderm form...
TRANSCRIPT
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Final Review
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Embryology
• Zygote: fertilized egg
• Gastrulation- endoderm, mesoderm, and ectoderm form
• Placenta: provides nutrients to the fetus
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Embryology
• Fetus: developing human from 8 weeks after fertilization until birth
• Embryo: organism in early stages of development
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EVOLUTION
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DEFINTIONS:
• Evolution: gradual change in an organism over time
• Natural Selection: process where organisms with favorable variations survive and produce more offspring
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DEFINITIONS
• Homologous Structures: similar structures found in unrelated organisms (ex: fin of whale vs. arm of a human)
• Vestigal Organ: nonfunctional organ that link to ancestors (ex: human’s appendix)
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DEFINITIONS:
• Adaptations: inherited trait that improves the chances of survival for an organism (EX: skin color, fur)
• Fossils: trace or remains of an organism
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DEFINITIONS:
• Variations: differing characteristics (ex: fur color in rabbits)
• Biogenesis: theory that living things arise from other living things
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Who is Darwin?
• Scientist that believed in natural selection (due to organisms adaptations) and survival of the fittest
• More offspring are produced than can survive
• Based his beliefs on observing different organisms
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What were the first living organisms?
• First living organisms were prokaryotes or do not have a nucleus (ex: bacteria)
• Endosymbiotic theory: prokaryotes engulf other prokaryotes= eukaryote
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BIG BANG
• Big Bang- universe was a dense sphere of gases that exploded into a gigantic cloud
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Evolutionary Evidence
• Fossils
• Fossil Records
• Absolute or relative dating (determining the number of carbon)
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Common Ancestor
• Anatomical similarities (homologous structures and vestigial structures)
• Embryological similarities
• Molecular similarities (ex: DNA or cytochrome c)
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Phylogenic Tree
• What common ancestor is shared by the diphyllidea and trematode?
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Miller & Urey
• Wanted to determine whether organic molecules could have formed before life was present
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Skip classification points 1 and 2
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Characteristics of Kingdoms
• Protista, Plantae, Fungi, Animalia are all eukaryotes!
• What are some characteristics of mammals?
warm-blooded
body hair
produce milk for young
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Hierarchical Sequence
• Kingdom King (broadest)
• Phlyum Philip
• Class Can’t
• Order Order
• Family fine
• Genus green
• Species soup. (most specific)
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Scientific name
• Comprised of genus and species
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Know this about classification
• Binomial Nomenclature: universally accepted name
• Homo sapians: humans
• Homo= genus
• Sapians= species
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Examples:
• Rana pipens:
• What is the species?
• What is the genus?
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Taxonomic Key
• Also called dichotomous key
• Describe and classify organisms
• Used on plants and animals
• Go to example
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Viruses & Bacteria
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Bacterium
• Unicellular prokaryotic cell
• Belongs to Bacteria kingdom:–archaebacteria (live in harsh
environments)
–Eubacteria (cause disease)
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• Prokaryote: Does not have a nucleus (bacteria)
• Eukaryote: has a nucleus
• Flagellum: whiplike structure found on the end of the bacteria
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Uses of Bacteria
• Break down wastes
• Food: yogurt, vitamins, pickles
• Clean up pollutants like oil
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Shapes of Bacteria
• Bacteria are classified according to their shape
• Coccus: circle• Bacillus: rod shaped• Spirillum: spiral• **know how to draw them**
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Definitions:
• Antibiotic: medicine that kills bacteria
• Antibody: immune response
• Virus: small particles of DNA or RNA surrounded by a protein coat
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Definitions
• Vaccine: weakened form of a virus that prevents illness
• Binary Fission: reproduction of bacteria
• Retrovirus: virus contains RNA (Ex: HIV)
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Definitions
• Bacteriophages: virus that infects bacteria
• Pathogen: bacteria that cause disease by toxins
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Definitions:
• Virus: »inner core (DNA/RNA)
»Capsids: protein coat
»Non living
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Viruses vs. Cells
• Viruses are much smaller than cells
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Cycles
»Lytic cycle: host cell is destroyed; Cause harm to humans by replicating
»Lysogenic: virus incorporates itself in host cell’s DNA
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Plants
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Vascular vs. Non vascular
• Vascular: contain vascular tissue (phloem and xylem); grow bigger
EX: trees,ferns• Nonvascular: lack vascular tissue;
live close to ground & can only move water a few cm.–EX: moss
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Xylem vs. Phloem
• Xylem: moves water upward
• Phloem: moves water in both directions
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Gymnosperm
• Seed plant whose seeds are not enclosed within a fruit
• EX: pine trees
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Angiosperms
• Flowering Plant
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Plant Organs:• Make sure you know the
different organs and organ diagrams- any questions, please ask!
• What organ absorbs the most water? ROOTS
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Plant Hormones
• Responsible for responses and metabolism
• Auxin: responsible for growth
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Tropism
• Phototropism: response to light
• Hydrotropism: water
• Thigmotropism: touch
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Definitions:
• Root: most water enters; carrots have tap root
• Stem: transport substances between roots and leaves
• Seed: plant embryo
• Fruit: another term for ovary
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Germination
• Temperature, water, and oxygen
• Tend to germinate in the spring
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Definitions
• Pollination: transfer of pollen from anther to stigma
• Alternation of generations: switch between haploid (gametorphyte) and diploid (sporophyte) stages
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Female Plant
• Consist of style, stigma, ovule, and ovary
• Collectively called the pistil
• Know diagrams- refer to your notes!!!
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Male Plant
• Consist of filament and anther
• Collectively called stamen
• Pollen is produced in the anther
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DIAGRAM
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RANDOM
• Meristematic Tissue: tissue that produces new cells
• Seed contains: plant embryo, food supply, and protective coating
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Digestive System
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Function & Diagram
• Break down food and absorb nutrients;
• Carbohydrates are broken down into monosaccharide
• Proteins are broken down into amino acids
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• A: Esophagus• B: gallbladder• C: Liver• D: Stomach• E: IGNORE• F: Pancreas• G: Small Intestine• H: Large Intestine
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Organs & Functions
• Mouth: digestion begins: teeth and salivary glands break up food using amylase
• Epiglottis: covering for the glottis (opening to larynx)
• Esophagus: carries food between pharynx and stomach
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Organs & Functions
• Stomach: contains HCl, pepsin, and mucus
• Small intestine: Chemical digestion and absorb; villi (finger like projections) to move food along
• Large Intestine: Absorbs water and minerals
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Other Organs
• Rectum: end of the intestine• Anus: wastes exit• Liver: produces bile• Gall bladder: stores bile• Pancreas: produces enzymes
to neutralize acids
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Other:
• Peristalsis: wavelike movement to move bolus toward stomach
• Bolus: saliva containing food, amylase, etc
• Bile: breaks down fats/oils (produced in liver)
• Feces: waste
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Circulatory System
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Blood Vessels
• Arteries: carry blood away from heart (aorta is largest)
• Veins: carry blood toward heart (thinner and have valves)
• Capillaries: smallest blood vessels
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Other important blood vessels
• Largest Artery= aorta
• Pulmonary Artery: carries deoxygenated blood from heart to lungs
• Pulmonary Vein: carries oxygenated blood from lungs to heart
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Entire Sequence
• Right atrium---right ventricle—pulmonary artery—lungs—pulmonary vein—left atrium—left ventricle
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Hemoglobin
• Carries oxygen
• Found in red blood cells
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blood components
• Red blood- delivers oxygen
• White blood cell- immunity
• Platelets: clotting
• Plasma: blood component
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• A: Aorta• B: Right Atrium• C: Left Atrium• D: Ignore• E: Bicuspid Valve• F: Left Ventricle• G: Right Ventricle