The optimal pH range for the stomach enzyme pepsin is
A. 7.3-7.4.
B. 10-12.
C. 12.0-13.5.
D. 6-8.
E. 2-4.
Answer: E
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For relaxation to occur,
A. calcium leaves the sarcoplasmic reticulum, and troponin binds calcium and blocks the binding sites on actin. B. calcium enters the myofibril, it detaches from myosin, and the binding sites on myosin become inactive. C. sarcoplasm calcium levels fall, calcium is removed from troponin, and tropomyosin blocks binding sites on actin. D. extracellular calcium levels fall, calcium is pumped into the myofibril, and tropomyosin slides away from actin.
Match the mineral with its function.A. Functions in carbon dioxide metabolism and transport, also needed for protein metabolismB. Component of hemoglobinC. A constituent of coenzymes; needed for bone formation and proper function of nerve and muscleD. Needed for the production of thyroxineE. Component of nucleic acids and ATP; used in bone formationPhosphorus
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What do the left common carotid, brachiocephalic artery and left subclavian all have in common?
A. The all are found in the abdominal cavity B. They all carry blood to the head. C. They are coronary vessels. D.
The most active phagocytic cells found in circulating blood are____
Fill in the blank(s) with the appropriate word(s).