Download Introduction to Cells

Survey
yes no Was this document useful for you?
   Thank you for your participation!

* Your assessment is very important for improving the work of artificial intelligence, which forms the content of this project

Document related concepts

List of types of proteins wikipedia, lookup

Mitosis wikipedia, lookup

Cytokinesis wikipedia, lookup

Extracellular matrix wikipedia, lookup

Amitosis wikipedia, lookup

Organ-on-a-chip wikipedia, lookup

JADE1 wikipedia, lookup

Cellular differentiation wikipedia, lookup

Cell culture wikipedia, lookup

Cell growth wikipedia, lookup

Cell encapsulation wikipedia, lookup

Cell cycle wikipedia, lookup

Tissue engineering wikipedia, lookup

Transcript
Do Now: Think-Pair-Share
What do we have in common with bacteria
living in our body ?
Microscope observations of organisms led to the
discovery of cells.
• 1665 – Robert Hook used the first microscope to discover
structures he called ‘cells’
• Ten years later , Anton van Leeuwenhoek used a more
powerful microscope to observe living organisms in
pond water.
• It took 150 years of improving the microscopes and
compiling the observations made by different scientists
to come up with
• Cell Theory :
• All living things are made of one or more cells
• Cells are the basic units of structure and function in
living organisms
• All cells arise from existing cells
Contributors to the Cell Theory – Theodor Schwann,
Rudolph Virchow, and Matthias Schleiden
Cells vary in size and shape. A cell’s shape reflects the
cell’s function.
Cells in Human Body
Cell size is limited by a cell’s surface area-to –volume ratio. Cells
with greater surface area – to – volume ratio (smaller cells) can
exchange substances more efficiently.
All cells share the following features :
• Cell membrane
• Cytoplasm
• Ribosomes
All cells are divided into Prokaryotic cells and
Eukaryotic cells.
Prokaryotic cells
• Very simple in their organization
• Have cell walls (some have capsule surrounding the cell wall)
• Small in size 1-15 µm
• Believed to appear 3.5 billion years ago
• Do not have nucleus or membrane-bound organelles
Examples all bacterial cells
Eukaryotic cells
• Complex organization
• Can carry out more functions
• First appeared 1.5 billion years ago
• Have nucleus
• Have many different membrane-bound organelles