A baby is admitted to the hospital with a history of projectile vomiting after each feeding. On examination, it is found that the sphincter controlling food passage from the stomach to the duodenum is thickened and does not open readily. Because of the baby's loss of gastric juice, his blood probably indicates ________.
A) acidosis
B) ketosis
C) alkalosis
D) dysphagia
C) alkalosis
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Which is a uniquely sympathetic function?
A) regulation of pupil size B) regulation of cardiac rate C) regulation of respiratory rate D) regulation of body temperature
Conduction occurs along an axon because
A) inflow of Na+ triggers the adjacent channels to open. B) outflow of K+ triggers the adjacent channels to open. C) axonal transport "walks" voltage changes along the membrane. D) once Na+ enters the cell, the entire membrane depolarizes simultaneously.
ansewer the questions below:
A. Patrick is snorkeling (surface swimming with a tube in his mouth to maintain breathing while his face is in the water). The snorkel tube is 40 cm in length and 1.2 cm in radius. How does this affect Patrick's breathing? Calculate the increase in relative resistance contributed by the snorkel tube. B. What is dead space and how does that affect snorkeling? Explain your answer, assuming the snorkel tube is a round cylinder and cylinder volume is pr2L. How does the snorkel tube affect alveolar ventilation (assume a ventilation rate of 12 breaths/min, tidal volume of 500 mL, and normal dead space volume of 150 mL)? If normal alveolar ventilation is 4200 mL/min, how must Patrick breathe during snorkeling compared to normal? C. Patrick loves snorkeling, but wishes he could go a little deeper. He decides to create a longer snorkel tube to try to achieve this desire. He isn't sure how radius figures in, so he makes two tubes of 60 cm length, one with a 1.2 cm radius and the other with a 2 cm radius. What are the relative resistances of these two new tubes? Do you think he will be able to snorkel well with either of these tubes? Explain.
Which of the following statements is true?
A. Damaged olfactory neurons are replaced. B. Olfactory epithelial receptors are highly specific. C. Olfaction first goes to the thalamus and is then relayed to the cerebral cortex. D. Continued stimulation of olfactory neurons produces the same level of response. E. Replacement of neurons is a common phenomenon in the body.