A scientist observes a particular nerve fiber that is among the fastest at conducting action potentials in the body. Which of the following best describes its likely structure?
A. Large diameter and unmyelinated
B. Large diameter and myelinated
C. Small diameter and unmyelinated
D. Small diameter and myelinated
Answer: B
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A sound with a frequency of 4000 Hz has a lower pitch than a sound with a frequency of 1000 Hz
Indicate whether the statement is true or false.
Which of the following is an example of procedural or implicit memory?
A. Reciting a poem B. Performing a choreographed dance C. Remembering your name D. Being afraid of snakes E. Locating Russia on a globe
The alimentary canal extends, in its entirety, from
A. the liver to the gallbladder. B. the stomach to the small intestine. C. the mouth to the anus. D. the mouth to the large intestine.
The brain, spinal cord, and lens and cornea of the eye develop from the primary germ layer called the:
a. ectoderm b. mesoderm c. endoderm d. none of the above