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structural feature of the xylem
cells are dead, thickened with lignin and with no end walls or contents
structural feature of the skeletal muscle
contain many mitochondria to provide ATP for muscle contraction
function of the goblet cell in the trachea
secrete mucus to trap bacteria and other breathed-in particles
structural feature of the red blood cell
disc-shaped with dimples in each side to provide and increased surface area
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