Muscle Tissue Function is to produce movement (contract) Contractive cells can shorten & thicken Three types Skeletal muscle Cardiac muscle Smooth muscle

Muscle Tissue Types Skeletal muscle Structure: Function: Location: 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

Muscle Tissue Types Cardiac muscle Structure: Function: Location: 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

Muscle Tissue Types Smooth muscle Structure Function Location 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

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