Contraction of the ________ layers of the intestinal wall functions to both agitate materials and propel them along the digestive tract.
A) mucosa
B) submucosa
C) serosa
D) muscularis externa
E) adventitia
D) muscularis externa
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Which lymphatic organs have a cortex and medulla?
A. Red bone marrow and lymph node B. Thymus and spleen C. Thymus and lymph node D. Lymph node and spleen
What is the most common cause of partial hearing loss (neural presbycusis)?
a. exposure to loud noises over 150 dB b. degenerative wearing out of hair cells c. rupture of the eardrum d. middle ear infections e. organ of Corti defect
The "rest-and-digest" system of the autonomic nervous system is the ________
A) parasympathetic B) sympathetic C) somatic nervous system D) peripheral nervous system
Compare strict dominance with codominance
A) In strict dominance, one allele dominates another so a heterozygote will exhibit the dominant phenotype for the trait. In codominance, both alleles are expressed so a heterozygote will exhibit both the phenotypes for the trait. B) In strict dominance, both alleles are expressed so a heterozygote will exhibit both the phenotypes for the trait. In codominance, one allele dominates another so a heterozygote will exhibit the dominant phenotype for the trait. C) In strict dominance, only the dominant allele is even present so the only phenotype expressed is that of the dominant allele. In codominance, only the recessive allele is even present so the only phenotype expressed is that of the recessive allele. D) In strict dominance, heterozygous alleles produce a phenotype that is intermediate to the phenotypes of individuals who are homozygous for one allele or the other. In codominance, one allele dominates another so a heterozygote will exhibit the dominant phenotype for the trait. E) In strict dominance, one allele dominates another so a heterozygote will exhibit the dominant phenotype for the trait. In codominance, heterozygous alleles produce a phenotype that is intermediate to the phenotypes of individuals who are homozygous for one allele or the other.