Osteocytes , hope this helps:)
Epithelial tissue covers the body surface and forms the lining for most internal cavities. The major function of epithelial tissue includes protection, secretion, absorption, and filtration. The skin is an organ made up of epithelial tissue which protects the body from dirt, dust, bacteria and other microbes that may be harmful. Cells of the epithelial tissue have different shapes as shown on the student's worksheet. Cells can be thin, flat to cubic to elongated. Cited from: https://www.msnucleus.org/membership/html/k-6/lc/humanbio/4/lchb4_3a.html
They should be concerned about his integument system. Skeletal would be bones respiratory would be breathing muscular would be muscle soreness.
The answer is Stomach
this digestive acid is usually called gastric acids.The gastric acids in our body is powerful enough to destroy a metal.
This process is happening before the digested foods enter the small intestine
