Cells and tissues
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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.


Cells and tissues

polar



Passive transport
Passive Transport

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



Cells and tissues

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


Cells and tissues

Epithelial Tissues

Functions = Barrier & Secretion


Cells and tissues

Connective Tissues

Functions = Structure & Support

(& ‘nutrition’)


Cells and tissues

Muscle Tissues

Functions = Contraction & Movement


Cells and tissues

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



Cells and tissues

Tissues Organs Organ Systems



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