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.

Biology & Microbiology

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