1 / 25

Cells and Tissues

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

lonato
Télécharger la présentation

Cells and Tissues

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript


  1. Cells and Tissues

  2. The Smallest Unit of Life

  3. Animal Cell

  4. 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.

  5. polar

  6. “Self-Sealing”

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

  8. Active Transport

  9. Endocytosis (stuff from out  in Exocytosis (stuff from in  out Phagocytosis (BIG stuff from out  in)

  10. 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

  11. Epithelial Tissues Functions = Barrier & Secretion

  12. Connective Tissues Functions = Structure & Support (& ‘nutrition’)

  13. Muscle Tissues Functions = Contraction & Movement

  14. Nervous Tissues Function = Communication

  15. Tissues: • Cells generally stick to each other (cell junctions) • Cells generally stick to a ‘ground’ (extracellular matrix junctions) • Cells generally communicate with each other

  16. Cell Junctions

  17. Tissues Organs Organ Systems

  18. Organ Systems

More Related