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Cells and Tissues. The Smallest Unit of Life. Animal Cell. Size of Bacteria Limited by:. Rate of Diffusion Molecules must move to ‘find’ where they are suppose to be. In a crowded environment, this might take a while unless the space is small. Surface Area

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Size of bacteria limited by
Size of Bacteria Limited by:

  • Rate of Diffusion

    • Molecules must move to ‘find’ where they are suppose to be. In a crowded environment, this might take a while unless the space is small.

    • Surface Area

    • Smaller cells have relatively large ‘surface to volume’ ration—more surface area for the volume inside. This helps with entry of nutrients and removal of waste, as both have to cross the ‘surface’. More area to cross (per volume)=better.


polar



Passive transport
Passive Transport

Molecules move from where they are most abundant (high concentration) to where they are sparse (low concentration).



Endocytosis (stuff from out  in

Exocytosis (stuff from in  out

Phagocytosis (BIG stuff from out  in)


Movement across cell membranes
Movement Across Cell Membranes

  • Passive Transport (No Energy; From Hi Low)

    • Simple Diffusion

    • Facilitated Diffusion (Requires Channel or Carrier)

  • Active Transport (Energy; Low Hi)

  • Bulk Transport

    • Pinocytosis

    • Endocytosis

    • Phagocytosis

    • Exocytosis


Epithelial Tissues

Functions = Barrier & Secretion


Connective Tissues

Functions = Structure & Support

(& ‘nutrition’)


Muscle Tissues

Functions = Contraction & Movement


Nervous Tissues

Function = Communication


Tissues
Tissues:

  • Cells generally stick to each other (cell junctions)

  • Cells generally stick to a ‘ground’ (extracellular matrix junctions)

  • Cells generally communicate with each other



Tissues Organs Organ Systems



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