The liver converts toxic ammonia to a harmless substance called ____
a. urea
b. carbohydrate
c. sodium
d. mineral salt
a
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Sally Student does not understand the differences between ions, isotopes, and free radicals. Assuming she has learned and understood some basic chemistry, what is the likely source of her confusion? Review the definitions of these terms, then make a table or flow chart to help her sort this out.
What will be an ideal response?
What causes RDS (respiratory distress syndrome) in premature babies?
A. Muscles associated with respiration are not strong enough to expand the thorax. B. Respiratory centers of the brain are not functional until late in the fetal stage. C. The lungs have not yet produced adequate numbers of alveoli for efficient gas exchange. D. There is insufficient production of surfactant. E. Bronchioles are constricted due to excess production of mucus.
A trait is said to exhibit ________ dominance when the phenotype of a heterozygous individual is intermediate between the phenotypes of individuals who are homozygous dominant and individuals who are homozygous recessive.
Fill in the blank(s) with the appropriate word(s).
Certain diseases, such as Parkinson's disease, will weaken the swallowing reflex and decrease the muscularis externa activity in the esophagus. What is one type of complication that can result?
a) Patients with Parkinson's disease may have trouble creating a bolus and pushing it posteriorly toward the oropharynx. b) Patients with Parkinson's disease may aspirate their food because the swallowing reflex may not properly trigger the elevation of the larynx. c) Patients with Parkinson's disease may have their food enter the stomach too quickly because the muscularis externa will increase peristalsis. d) Patients with Parkinson's disease will vomit more often due to the muscularis externa activity being decreased.