Which of the following is correctly associated with the medulla oblongata?
A. It is the most superior portion of the brainstem.
B. It contains enlargements called cerebral peduncles.
C. It gives rise to conscious thoughts.
D. It relays sensory information.
E. It contains nuclei for regulation of heart rate and blood vessel diameter.
Answer: E
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The term _____________ refers to a membrane that allows some things to pass through it, but not others.
A. selectively permeable B. glycocalyx C. phospholipid bilayer D. specificity E. carrier-mediated
Which of the following statements is true about teeth?
A. The outer surface of enamel forms the crown of a tooth. B. The primary component of teeth is dentin. C. The root is covered by cementum. D. All of the choices are correct.
Which statement is true about melanin and melanocytes?
a. It is produced by cells that are located in the stratum spinosum. b. It is a pigment that accumulates inside keratinocytes. c. Darker-skinned individuals have more melanocytes than lighter-skinned individuals. d. Albinism is caused by a lack of melanocytes in the body.
Decussation occurs when:
a. some nerve tracts cross over to the other side of the body b. sensory and motor tracts are intermixed c. synapses occur outside of the ganglia d. a spinal nerve becomes pinched