tissues and organs section 15-1
DESCRIPTION
5 Levels of Organization A single cell Tissues Organs Organ Systems OrganismTRANSCRIPT
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Tissues and Organs
Section 15-1
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5 Levels of Organization
A single cellTissuesOrgansOrgan SystemsOrganism
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Tissues
A tissue is a group of similar cells that perform the same function.
There are 4 basic types of tissue in the human bodyMuscleConnective Nerve Epithelial
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Muscle Tissue
The only kind of tissue in your body that has the ability to contract or shorten
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Photo in public domain: http://en.wikipedia.org/wiki/File:Illu_muscle_tissues.jpg
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Muscle Tissue
Three types of muscle tissue have different jobs1. Pulls on bones allowing you to move
(skeletal)2. Lines the walls of structures in your body
and does things like move food through your digestive track (smooth)
3. Pumps blood (cardiac)
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Connective Tissue Provides support
for your body and connects all its parts
Includes: Tendons,
cartilage and ligaments
Bones Blood Fat
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Photos in public domain
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Nerve Tissue
Carries messages back and forth between the brain and spinal cord and every other part of your body
Messages can move at up to 100 meters per second (about 1/3 the speed of sound)
7The Brain contains about 1 trillion neurons – the cells that make up nerve tissue.
Photo from BrainMaps.org
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Epithelial Tissue
Forms a protective surface on the outside of your body
Lines the cavities of the mouth, throat, ears, stomach and other body parts.
Forms the covering or lining of all internal and external body surfaces
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Functions of Epithelial Tissue
Protection Sensation Secretion AbsorptionExcretion Diffusion Cleaning Reduces Friction
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Forms of Epithelial Tissue
Diagram in public domain: http://ms.wikipedia.org/wiki/Fail:Illu_epithelium.jpg
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Organs
A group of different tissues that has a specific function
Examples:
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Organ Systems
Groups of organs working together
Examples:
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