1.1 Introduction to cells

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1.1 Introduction to cells
  1. Cell theory
    1. smallest life unit
      1. from pre-existing cells
        1. living organisms-cells
        2. Unicellular organisms
          1. carry all functions
            1. metabolism-excrete respire
              1. response to stimuli
                1. growth
                  1. reproduction
                    1. homeostasis
                      1. nutrition
                    2. Surface area: volume
                      1. cellsize limited
                        1. diffusion of exchange materials
                        2. v increase more than s.a
                          1. leads to problem
                            1. necessary exchange limited;
                              1. overcome
                                1. protruding extensions
                                  1. flattening cells
                            2. Emergent properties
                              1. Multicellular organisms
                                1. achieve more than = of each cell could do
                                  1. cells interact
                              2. Magnification
                                1. magnified size / real size
                                  1. using microscopes
                                    1. TEM
                                      1. study internal
                                      2. SEM
                                        1. study outer cells
                                        2. light compound mic
                                          1. objective lens power * eyelens power
                                      3. Stem cells-unspecialised
                                        1. totipotent
                                          1. embryo
                                            1. high potency of all cell
                                          2. pluripotent
                                            1. zyogote --> blastocyst
                                              1. apart potency
                                            2. multipotent
                                              1. limited potency
                                              2. differ normal cells
                                                1. undifferentiated
                                                  1. self-sustaining
                                                  2. therapeutic use
                                                    1. bone marrow transplant
                                                      1. treat leukaemia
                                                      2. Stargardt's disease
                                                        1. retinal pigment epithelial cells
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