Two patients are brought to the emergency room. One has cut his finger with a knife; the other has stepped on a nail. Which wound has a greater chance of becoming infected? Why?
What will be an ideal response?
The puncture wound has a greater chance of becoming infected than the knife cut because the cut from the knife will bleed freely, washing away many of the bacteria from the wound site. In a puncture wound, bacteria can be forced beneath the surface of the skin and past the skin's protective barriers, thus increasing the possibility of infection.
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List and explain two ways hormones affect their targets.
What will be an ideal response?
The ____________________hormones are derived from tyrosine
Fill in the blank(s) with correct word
Epithelial tissue ________
A) None of the listed responses is correct. B) has two free surfaces C) does not have cell junctions D) is avascular
Microfilaments
A) are usually composed of myosin. B) are hollow, filamentous structures. C) anchor the cytoskeleton to the plasma membrane. D) are about 25 nm in diameter. E) are found in the cytoplasm radiating away from the centrosome.