_________ is a disorder in which hard fibrous tissue replaces myelin, impeding neural transmission.
A) Autism
B) Multiple sclerosis
C) Down syndrome
D) Phenylketonuria
Question 2According to the data accumulated by the National Center for Health Statistics in 2014, cancer and heart disease:
A) are the most common causes of death in young adults more than any other cause.
B) kill a smaller percentage of people aged 25 to 44 than aged 15 to 24.
C) take fourth and fifth place in the list of leading causes of death for teenagers and early adults.
D) are more frequently diagnosed in early adulthood than in middle adulthood.
Question 3_________ transmits impulses to other neurons.
A) A myelin sheath
B) An axon
C) A dendrite
D) The amygdala
Question 4In the context of the data collected by the National Center for Health Statistics in the United States in 2014, which of the following is true of the causes of death during early adulthood?
A) Homicide and suicide are the most common causes of death during this time.
B) AIDS is a much more prominent cause of death among 15- to 24-year-olds as compared to 25- to 44-year-olds.
C) Heart disease and cancer are the most common causes of death during this time.
D) Accidents are the leading cause of death during this time.
Question 5_________ can be up to several feet in length if it is carrying messages from the toes to the spine.
A) A neurotransmitter
B) An axon
C) A dendrite
D) The amygdala
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