Transcript 1.3 CELLS WORKING TOGETHER

1.3 Levels of Organization
(p44 - 47)
Levels of Organization
• Multi-celled Organisms have different
levels of organization:
Organelles  Cells  Tissues 
Organs  Organ systems 
Organisms
• So we have looked at cells, next is tissues.
Tissues
• Groups of cells working together form
tissues.
• There are four basic types of tissue in the
human body.
i) Muscle
ii) Epithelial
iii) Connective
iv) Nervous
1. Muscle Tissue
• Enables body parts to move, exert force,
or change shape.
• There are three types of muscle tissue:
– Skeletal: part of the skeleton, movement
– Smooth: stomach, intestine, change shape
– Cardiac: heart, beats to move blood.
2. Epithelial Tissue
• Covers the external and internal body
surfaces.
• Includes skin and linings of stomach,
intestine and glands which produce
hormones, enzymes and sweat
• Primary purpose  protection.
3. Connective Tissue
• Strengthens, supports, or connects cells
and tissues.
• Forms blood
• Stores fat
• Fills empty spaces
4. Nervous Tissue
• Senses, conducts, stores and transmits
information.
Organs and Organ Systems
• Groups of tissue work together to form
organs, which work together in organ
systems.
• An organ is made up of different tissues
working together to perform a specific
task. Contains at least 2 different kinds of
tissue.
Organ Systems
• A group of organs that interact with each
other to perform a common task.
• There are 11 different organ systems in
the human body.
Classwork
• Read pages p 46-47
• Do BLM 1-20
BLM 1-21
• Now let’s measure your heart beat!
Do Activity 1.17 (p49)