Which of the following is not a function of the respiratory system?
A. It helps to expel abdominal contents during defecation and childbirth.
B. It contributes to maintenance of pH balance.
C. It helps to transport gases to tissues.
D. It allows exchange of oxygen and carbon dioxide between blood and air.
E. It permits vocalizations.
Answer: C
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________ line the brain ventricles and spinal canal
A) Astrocytes B) Satellite cells C) Oligodendrocytes D) Microglia E) Ependymal cells
Which of the following is true of the endocrine system?
A) It responds rapidly to stimuli. B) It responds specifically to digestive stimuli. C) It communicates by the release of neurotransmitters. D) It responds with motor output. E) It responds slowly but effectively for maintaining homeostatic functions.
The bone cells that contribute to increases in calcium in blood are the
A) chondrocytes. B) osteons. C) osteoclasts. D) osteocytes. E) osteoblasts.
Cross bridges
a. bind to actin during muscle contraction b. are globular heads made of myosin c. do not bend during muscle contraction d. have characteristics a and b e. have characteristics b and c