Which description best illustrates the product of a chemical reaction?
a. It is joined by an ionic bond only.
b. It is always in equilibrium with the reactants.
c. It is the substance that initiates the reaction.
d. It is generally written on the left side of the equation.
e. It is generally written on the right side and is the substance generated by the reaction.
e
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The quick response of the immune system to a second infection is due to the _____, a feature of the immune system as demonstrated by the success of vaccines
a. activation of macrophage cells b. suppression of suppressor cells c. T and B memory cells d. high levels of antigen e. new cytotoxic T cell.
What are the most common cells that line the surface of the alveoli and are therefore associated with the exchange of gases within the lungs?
A) macrophages B) goblet cells C) type I alveolar cells D) type II alveolar cells E) type III alveolar cells
Which neurotransmitter is not an amino acid derivative?
A) GABA B) serotonin C) histamine D) dopamine E) glutamate
Imagine that a patient is admitted to the hospital after falling from the second-story window of her apartment. Tests reveal no injuries other than some swelling in the brain. Why, then, would her breathing become irregular?
A) The blood returning to the lungs from the brain is too high in oxygen. B) Her tissues require more oxygen for healing. C) The damage to the brain is affecting the respiratory center in the medulla. D) Her swollen brain is causing a decrease in blood pressure. E) The respiratory center in the lungs is malfunctioning due to a lack of carbon dioxide.