When defective erythrocytes are broken down,
A. bilirubin is formed from the breakdown of hemoglobin.
B. their iron is excreted into the small intestine.
C. their components cannot be recycled.
D. they are removed from the blood by the lungs.
E. their heme groups are converted into amino acids.
Answer: A
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Kidney stones can be caused by any of the following except ________
A) Calcium B) Uric acid C) Kidney infection D) Potassium
Hemoglobin is composed of ________ polypeptide chains.
Fill in the blank(s) with the appropriate word(s).
Nervous control of gastric secretion is provided by ________.
A) somatic neurons in the spinal cord B) the vagus nerve and enteric plexus C) the rubrospinal tracts D) the reticulospinal and vestibulospinal tracts
A goiter is a growth on the:
a. pancreas. b. parathyroids. c. pituitary. d. thyroid.