Download Nerve activates contraction

Muscle Tissue
 Function is to produce movement (contract)
 Contractive cells can shorten & thicken
 Three types
 Skeletal muscle
 Cardiac muscle
 Smooth muscle
Copyright © 2006 Pearson Education, Inc., publishing as Benjamin Cummings
Muscle Tissue Types
 Skeletal muscle
 Structure:
 Muscle Fiber – long, cylindrical cell
 Many nuclei in each cell
 Cells are striated – alternating light
& dark pattern
 Function:
 Voluntary movement:
 Pull bones (body movement)
 Pull skin (facial expression)
 Location:
 Attached to bones
Figure 3.20a
Copyright © 2006 Pearson Education, Inc., publishing as Benjamin Cummings
Muscle Tissue Types
 Cardiac muscle
 Structure:
 Cells are striated
 One nucleus per cell
 Cells joined end-to-end with
intercalated disk in-between.
 Function:
 Involuntary heart movement
 Pumping blood
 Location:
 Heart muscle
Figure 3.20b
Copyright © 2006 Pearson Education, Inc., publishing as Benjamin Cummings
Muscle Tissue Types
 Smooth muscle
 Structure
 Shorter cells
 One nucleus per cell
 No visible striations
 Function
 Involuntary movement
 Peristalsis- wave-like movement pushes
food through digestive system
 Location
 Walls of hollow internal organs
 Ex: Stomach, Intestines, Bladder,
Uterus, Blood vessels
Figure 3.20c
Copyright © 2006 Pearson Education, Inc., publishing as Benjamin Cummings
Nervous Tissue
 Structure:
 Nerve cells- neurons with
cytoplasmic extensions
 Neuroglial cells- support neurons
 Function:
 Sense changes in the environment
 Respond by transmitting impulses
 Location:
 Brain
 Spinal cord
 Peripheral nerves
Figure 3.21
Copyright © 2006 Pearson Education, Inc., publishing as Benjamin Cummings