Which statement is incorrect?
a. PTH causes an increase in plasma calcium by activation of osteoclasts.
b. PTH increases renal reabsorption of calcium.
c. Vitamin D causes an increase in Ca2+ secretion into the lumen of the digestive tract.
d. Calcitonin causes a decrease in plasma calcium by decreasing Ca2+ movement from the bone fluid into the plasma and by suppressing bone resorption.
e. When plasma calcium increases, PTH decreases and calcitonin increases.
C
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Hormones are highly specific because they are
A. each active in every cell in the body. B. recognized by specific receptors. C. produced by the body. D. faster than nervous impulses.
Ossification of the ends of long bones ________.
A) is a characteristic of intramembranous bone formation B) involves medullary cavity formation C) is produced by secondary ossification centers D) takes twice as long as diaphysis
Lymphoid tissue is mainly reticular connective tissue
Indicate whether the statement is true or false
The most effective regulator of blood pH is:
a. the buffer system b. the respiratory system c. the urinary system d. both B and C are equally effective