In which of the following would the motor units have the fewest muscle fibers?
A) muscle that control the eyes
B) calf muscles
C) muscles of the neck
D) postural muscles of the back
E) thigh muscles
A) muscle that control the eyes
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Which of the following is not a function of parathyroid hormone (PTH)?
A. Promote calcium reabsorption by the kidneys B. Stimulate osteoclast activity C. Lower blood calcium D. Promote calcitriol synthesis E. Inhibit osteoblast activity
Surfactant is:
A) produced by the mucous cells of the left and right mainstem bronchi. B) quickly destroyed in patients who have a severe upper airway obstruction. C) a phospholipid compound that decreases surface tension on the alveolar walls. D) a lubricating substance that increases alveolar surface tension during breathing.
________ is a bacterial infection of the upper respiratory tract.
A. Tuberculosis B. Pulmonary fibrosis C. Strep throat D. Pneumonia
Which development occurs in the eighth and ninth months of fetal development?
A) Eyebrows and eyelashes appear over partially open eyelids. B) Eyelids partially open and the lungs begin to produce surfactant. C) Neuron networks form, lanugo is shed, and blood cells form in the bone marrow. D) Fat is deposited in subcutaneous tissues, and the eyelids can completely open.