Humans can smell as many as 10,000 different odors but have significantly fewer types of olfactory receptors. Which of the following is the best explanation for why humans can distinguish so many smells?
A) The belief that we can smell so many different distinct odors is a psychological process referred to as an uncinate fit or olfactory hallucination.
B) The olfactory pathway travels to location in the brain in which memories are formed and we simply mix this new sensory information with old memories.
C) The sensation of a single, distinct smell is a combination of a variety of chemicals that stimulate different combinations of olfactory receptor cells all at once.
D) Taste receptors that are active at the same time influence the subtlety of what we smell.
C
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Indicate whether this statement is true or false.
The spinal cord lacks a portion of the dura mater known as the:
A) subdural space. B) epidural space. C) meningeal layer. D) periosteal layer.
The brain and spinal cord are covered by the __________, composed of three membrane layers.
Fill in the blank(s) with the appropriate word(s).
The rough endoplasmic reticulum performs which of the following functions?
A. ATP synthesis B. Protein synthesis C. DNA synthesis D. Active transport E. Polysaccharide hydrolysis