Answer the following statement(s) true (T) or false (F)
1. There is only a single type of pain receptor.
2. Hormones must be present at high concentrations to elicit an effect.
3. A molecule can act as both a neurotransmitter and a hormone.
4. The brain controls organ system function only through direct contact with sympathetic or parasympathetic nerves.
5. The thyroid requires negative feedback to prevent overgrowth.
1. FALSE - Activation of multiple types of receptors can be interpreted as "pain" especially with unusually high degrees of activation.
2. FALSE
3. TRUE
4. FALSE
5. TRUE - The resulting overgrowth is called a goiter.
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Compare and contrast the out-of-Africa model and multiregional theories of the origin of modern man. Which theory is supported by the preponderance of genetic evidence? What type of evidence supports the other theory
What will be an ideal response?
Elevations of which of the following antibodies may indicate a parasitic infection?
a. IgG b. IgA c. IgM d. IgE
All EXCEPT which of the following has an effect on
seed germination? a. moisture b. temperature c. carbon dioxide d. number of daylight hours e. oxygen
The tendency for plants to grow toward light is known as
A. thigmotropism. B. opportunism. C. phototropism. D. geotropism.