Many people, when they have a sinus headache, often use decongestant nasal sprays. Why are such sprays useful?
A) They have a pain-blocking effect in the brain.
B) They dry out the breathing passageways in the pharynx, making it easier to breathe.
C) They reduce swelling, allowing the sinuses to drain.
D) They reduce the symptoms of sore throat inflammation, which exacerbates the pain.
Answer: C
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Which is NOT an effect of the hormonal products of the adrenal medulla?
A. accelerate heartbeat B. stimulate synthesis of glycogen C. increase blood pressure D. reduce blood flow to the skin and digestive organs E. increase blood sugar
Which of the following is a similarity between bryophytes and seedless vascular plants?
A. They both contain lignin. B. They both alternate generations between gametophyte and sporophyte. C. They both have no vascular tissues. D. They are both independent of water for reproduction.
During the S period of interphase
a. cell growth takes place. b. nothing occurs because this is a resting period. c. chromosomes divide. d. synthesis (or replication) of the nucleoproteins takes place.
The chemical elements that are available to producers are usually in what form?
a. ions b. gases c. solids d. compounds e. hydrocarbons