Multiple sclerosis results from which of these?
The destruction of the myelin sheath that surrounds axons in the CNS
The inhibition of the ion channels crossing the cell membrane
The underproduction of neurotransmitters
The failure of motor neurons to carry information
A. The destruction of the myelin sheath that surrounds axons in the CNS
Biology & Microbiology
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From the following, select the animal with the least advanced nerve cord
a. chordate b. arthropod c. flatworm d. human e. octopus
Biology & Microbiology
Trichoplax is a
a. sponge. b. cnidarian. c. placozoan. d. choanoflagellate. e. flatworm.
Biology & Microbiology
The liver, pancreas, and lining of the digestive tract come from ________
A) ectoderm B) endoderm C) mesoderm D) endometrium
Biology & Microbiology
White blood cells are a type of
A) Connective tissue B) Epithelial tissue C) Muscle tissue D) Nervous tissue
Biology & Microbiology