To synthesize thyroid hormones, iodine is attached to
A. the amino acid tryptophan.
B. acetyl coenzyme A.
C. cholesterol.
D. the amino acid tyrosine.
E. the amino acid phenylalanine.
Answer: D
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Which type of connective tissue is found in the papillary layer of the dermis and contains all of the cell types of connective tissue proper?
A. Adipose B. Reticular C. Dense irregular D. Dense regular E. Areolar
Muscle spasms of the back often are due to the erector spinae contraction
Indicate whether the statement is true or false
The indicators that are essential for human life include all of the following EXCEPT ________.
A. coloring B. heart rate C. respirations D. temperature
______ occurs when the inside of the plasma membrane becomes more negative, and ______occurs when the inside of the plasma membrane becomes less negative.
Fill in the blank(s) with the appropriate word(s).