Which of the following is most influential in maintaining pH balance in the body?
A. Stretch receptors
B. O2 levels in the blood
C. O2 levels in the alveolar air spaces
D. CO2 levels in the blood
E. CO2 levels in the alveolar air spaces
D. CO2 levels in the blood
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Competition for receptors is strictly a pharmacological phenomenon, since naturally occurring chemical messengers do not compete with each other for the same receptor site.
Answer the following statement true (T) or false (F)
Which labeled structure in the diagrams of the pelvis terminates anteriorly as the anterior superior iliac spine?
a) A b) B c) C d) D e) H
Changes in digestive function related to GIP and Gastrin are associated with:
a. external influences b. local changes in the digestive tract c. intrinsic nerve plexus d. extrinsic autonomic nerves e. gastrointestinal hormones
Which of the following statements concerning musculoskeletal system development is true?
A. Myoblasts produce somites. B. Enlargement of muscles after birth is due to an increase in the number of muscle fibers. C. Ossification ends before birth. D. Skeletal muscles develop from crest cells. E. The vertebral column develops from somite-derived mesoderm.