multicellular life evolution of multicellular life animal tissue types
TRANSCRIPT
Multicellular life
Evolution of multicellular life
Animal tissue types
CampbellFig1.1
CampbellFig 20.2
Animal tissue types
• What is a tissue?
• A cooperative unit of many very similar cells that perform a specific function.
• Examples– Epithelial– Connective– Muscle– Nervous
Epithelial tissue
• Covers and lines the body and its parts
• One surface free, the other bound to basement membrane
• Tissues are named by – Shape of cells– Number of layers of cells
Epithelial tissue
• Simple = single layer
• Stratified = multiple layers
• Squamous = flat (tiles)
• Cuboidal = like dice
• Columnar = like bricks
CampbellFig 20.4
Simple SquamousSimple Cuboidal
Lines the lungsIn the kidney tubules
CampbellFig 20.4
Stratified Squamous Epithelium
Lines the esophagus
CampbellFig 20.4
Ciliated columnar epithelium
Lines the air ways in the respiratory system
CampbellFig 20.4
Connective tissue• Binds other tissues an provides support
matrices
• Few cells in a nonliving matrix
• Three fiber types– Collagen fibers– Elastic fibers– Reticular fibers
• Fibroblasts - cells that produce connective tissue
Loose connective tissue(Areolar)
Holds other tissue in placeA “binding” material
CampbellFig 20.5A
Other Connective tissues
Loose
Adipose
Blood
Fibrous connective
Cartilage
CampbellFig 20.5
Bone
Tendons
Dense connective tissue thatAttaches muscle to bone
Like CampbellFig 30.7
Bone Tissue
• Osteocytes• Haversian canal• Lamelle (matrix)
CampbellFig 20.5D
Bone Development
Muscle tissue• Functions in movement• Bundles of long cells ( muscle fiber= muscle cell)
• Skeletal muscle– Attached to bones by tendons, produces voluntary movement– Striated unbranched
• Smooth muscle– Found in walls of digestive tract, produces involuntary movements– Unstriated, spindle shaped
• Cardiac Muscle– Striated , branched, produces heartbeat
Muscle tissueCampbell 20.6
Smoothmuscle
Skeletalmuscle
Cardiacmuscle
• Responsible for coordinating body activties
• Neurons are nerve cells
• Motor neurons are nerves that activate muscles
• Sensory neurons transmit information
• Composed of cell body and dendrites
• Supported by glial cells
Nervous Tissue
CampbellFig 28.3AModified
Nervous TissueCampbellFig 28.2
Summary