Which of the following is required to produce calcitrol in the kidneys?
A) calcium
B) sodium
C) vitamin C
D) vitamin A
E) vitamin D
E) vitamin D
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Cardiac muscle cells tend to be thicker and shorter than skeletal muscle cells
Indicate whether this statement is true or false.
Cells of the intestine are very permeable to water while some cells of the kidney tubule are not at all permeable to water. Can you suggest some ways these two types of cells might be structurally different from each other?
What will be an ideal response?
In the body's lever systems, the fulcrums are represented by the
a. joints b. long bones c. tendons d. short bones e. skeletal muscles
Heavy smoking destroys pseudostratified ciliated epithelium in the trachea ("windpipe"). Which of these conditions might occur in the trachea if replacement epithelial cells were not ciliated?
A) accumulation of mucus in the trachea B) accumulation of foreign particles in the trachea C) increased coughing D) Both accumulation of foreign particles in the trachea and increased coughing would be expected. E) All of these would be expected.