Some of these receptors bind to antigens in the blood. The
antigen are then endocytosed and identified. Some of the receptors such as the MHC II are
used in antigen-presentation. They display the antigen for identification and
activation of other lymphocytes.
Answer: Aquifers are structures used to transport water from city to city
Explanation: Aqui or Aqua means water... the word fer looks life transfer or reminds me of the word transfer so the word Aquifer means to transfer water
X-rays
used to measure bone density.
<u>Explanation</u>:
The bones density test measured by the X-rays, it measures the content of calcium and other bone minerals that are packed into the segment of bone. Most commonly used parts of bone for testing are spine, hip, occasionally and the forearm. It is generally done to know the chances of osteoporosis. More the bone minerals, more will be density. More density means the higher bone strength. Before the test, a person should avoid having calcium supplement.
