m ulticellular o rganisms cellular differentiation tissues organs organ systems
TRANSCRIPT
MULTICELLULAR ORGANISMSCellular Differentiation
Tissues
Organs
Organ Systems
CELLULAR DIFFERENTIATION – RECAP!
Cell specialization takes place early in the development of multicellular organisms
Each cell undergoes changes and develops characteristics to make it unique from other cells
Once a cell has differentiated it can perform a very specific function within the organism.
Examples of differentiated cells in our bodies:
Muscle Cells Fat Cells
Epithelial Cells Nerve Cells
What happens next?
Tissues Organs Organ Systems
Tissues A group of cells that are similar in shape
and function are called a TISSUE In animals, there are 4 basic types of
tissues; epithelial tissue, muscle tissue, connective tissue and nervous tissue.
E.g. Blood – connective tissue External covering and lining for mouth, heart, liver, eyes – epithelial tissue
In plants – tissues made from thick walled plant cells are used for structure
Organs Organs are different tissues that group
together to form larger structures that work together to achieve one or more functions within the organism.
Skin is the largest human organ and it is made up of connective, epithelial, nervous and fat tissues
Skins provides structural support and barrier that protects our insides from our outside!
Other animal organs are:
Organ Systems Organs never work alone 2 or more organs working together to perform
a related function are a organ system. Organ systems often overlap and share
organs Organ systems are interdependent – they
need contact with the brain in order to function properly.
Plants have 2 major organ systems: the root system and the shoot system
How many different animal systems can you think of?
HUMAN ORGAN SYSTEMS
CHECK YOUR LEARNING
1. In your own words, write a definition for cell, tissue, organ, and organ system. Give an example of each of these in your body.
2. Name the 5 organ systems in your body that you learned about in this section.
a) What is the major function or each of these systems?
b) What are the 4 types of tissues found in most organ systems?