The Cellular Basis of Life

Levels of understanding of life

1)Atomic

2)Molecular

3)Organelle

4)Cellular

5)Tissue

6)Organ

7)Organ system

8)Organism

9)Higher

Life

Any sustaining chemical system capable of Darwinian evolution

Homeostasis

The constant maintenance of an organism’s internal bodily system in spite of its external environment

Van Leuwenhoek

Invented the microscope to see the microscopic world during the 1800s

Living organisms must be able to

-Organise themselves via cells’

-Metabolise

-Grow

-Respond to external stimuli

-Maintain homeostasis

-Reproduce

-Evolve

The Cell Theory was proposed by German scientists ______________

Scheiden and Schwann

Cell theory states

1) All creatures are made from cells

2)All cells arise from pre-existing cells

3)Cells can live alone(unicellular) or live together(multicellular)

Fibroblasts

Cells that are found in connective tissue that make proteins e.g. collagen and elastin

Endoplasmic reticulum

Large continuous network of membranes inside eukaryotic cells that help to make, process and transport proteins

Lysosome

Membrane-bound cell organelle that acts as a cell’s garbage disposal

Golgi apparatus

Membrane-bound cell organelle that modifies, sorts and packages proteins and lipids to send them to other locations