Many people, when they have a sinus headache, often use decongestant nasal sprays. Why are such sprays useful?
A) They reduce swelling, allowing the sinuses to drain.
B) They reduce the symptoms of sore throat inflammation, which exacerbates the pain.
C) They dry out the breathing passageways in the pharynx, making it easier to breathe.
D) They have a pain-blocking effect in the brain.
A
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Much of the genetic variation seen in the human population is neutral
A. true B. false
The synthesis and secretion of ____ is ultimately regulated by gonadotropin-releasing hormone from the ____
a. estrogen; posterior pituitary b. estrogen; ovaries
c. testosterone; hypothalamus d. testosterone; testes e. androgens; gonads
Which of the following could be considered a reactant used during the light-dependent reactions, but a product made during the Calvin cycle?
a. ATP b. NADPH c. NADP+ d. oxygen
In a reflex arc, the correct sequence of cell types through which an electrical signal would pass would be
A. motor neuron ? sensory neuron ? interneuron in the PNS B. sensory neuron ? motor neuron ? interneuron in the CNS C. sensory neuron ? interneuron in the CNS ? motor neuron D. motor neuron ? interneuron in the PNS ? sensory neuron