Premature babies frequently need to be put on a respirator to help them breathe. Why does this become a necessary treatment for many premature babies?
What will be an ideal response?
The lungs are one of the last organs to develop during pregnancy and the type II alveolar cells are particularly late in developing. Since the type II alveolar cells secrete surfactant, premature babies may not make enough surfactant to reduce the resistance to breathing and may need positive pressure oxygen to be given along with surfactant to help them breathe on their own.
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What muscle elevates the soft palate when swallowing?
A. Tensor veli palatini B. Stylopharyngeus C. Superior constrictor D. Palatopharyngeus E. Levator veli palatini
To achieve fluid balance, ion concentration gradients are eliminated by
A) osmosis. B) diffusion. C) active transport. D) pinocytosis. E) facilitated diffusion.
Which of the following kinds of information do fine-touch and light-pressure mechanoreceptors provide?
A) location of the stimulus B) shape of the stimulus C) texture of the stimulus D) movement of the stimulus E) All of the answers are correct.
Which of the following factors would NOT tend to increase systemic arterial blood pressure?
A. increased sympathetic stimulation of the blood vessels B. increased blood volume C. increased venous return D. increased parasympathetic stimulation of the heart E. increased activity of the skeletal muscle pump