Where does the electrical impulse start in the heart?
a. sinoatrial node b. atrioventricular node
c. bundle of His d. Purkinje fibers
a
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A developmental disability may be caused by all of the following EXCEPT:
A. a condition that impairs the development of the brain in the fetus. B. damage to the newborn during the birth process. C. a disease or an injury that causes damage to the brain or body after birth and before age 22. D. a disease or an injury that causes damage to the brain or body after birth and before age 30.
What is another name for baroreceptors?
A. chemoreceptors B. juxtacapillary receptors C. proprioceptors D. pressoreceptors
Which of the following classes of hematopoietic cells is committed to becoming an erythrocyte?
a. Hematopoietic stem cell b. Multipotential progenitor cell c. Committed lymphoid progenitor d. BFU-E
Which of the following is a frequent cause of bacterial infections, including blood infections, epiglottitis, and pneumonia, in infants and young children in the United States?
A. croup B. Haemophilus influenzae type B C. tuberculosis D. common cold