Which of the following is an active proteolytic enzyme?
a. pepsinogen
b. chymotrypsinogen
c. procarboxypeptidase
d. secretin
e. None of the above
E
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Which of the following enters a target cell's nucleus and acts directly on the genes?
A. Insulin B. Antidiuretic hormone (ADH) C. Estrogen D. Glucagon E. Oxytocin (OT)
Answer the following statements true (T) or false (F)
1. Glasses can successfully treat presbyopia. 2. The average man and woman have the same number of birthdays. 3. The prenatal period of life usually starts in the oviduct. 4. The blastocyst has about three times the mass of the zygote. 5. Although the function of the placenta is to act as a barrier between the mother and fetus, substances such as alcohol can cross the barrier.
During expiration, the alveolar pressure must be
A. greater than atmospheric pressure. B. greater than pleural pressure. C. less than atmospheric pressure. D. equal to atmospheric pressure. E. None of these choices is correct.
Low blood oxygen levels stimulate erythrocyte production by increasing the formation of _________________ by the kidneys
Fill in the blank(s) with the appropriate word(s).