In which process do the germ layers differentiate into organs and organ systems?
Organogenesis
Embryogenesis
Gastrulation
Cleavage
Neurulation
The Correct Answer is A
A. Organogenesis: This is the process during which the three germ layers (ectoderm, mesoderm, endoderm) give rise to organs and organ systems.
B. Embryogenesis: Broad term that includes all development from fertilization to the fetal stage.
C. Gastrulation: Earlier stage in which the three germ layers form from the epiblast.
D. Cleavage: Series of mitotic divisions that create the blastocyst; occurs before germ layer formation.
E. Neurulation: This is a fundamental process in the early development of vertebrate embryos that establishes the central nervous system. It's the intricate series of events where a flat sheet of cells, the neural plate, folds and transforms into a hollow structure called the neural tube.
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Related Questions
Correct Answer is {"dropdown-group-1":"B"}
Explanation
A. Lymph nodes: Lymph nodes do undergo some changes with age but not as dramatically as the thymus.
B. Thymus: The thymus undergoes involution after puberty, shrinking in size and being replaced largely by fat, which significantly reduces T-cell production.
C. Spleen: While some function may decline with age, the spleen does not undergo the same marked involution as the thymus.
D. Pharyngeal tonsils: The tonsils may atrophy slightly with age, but the effect is less pronounced than with the thymus.
E. Appendix: The appendix may reduce in lymphoid tissue over time but does not exhibit the same profound involution.
Correct Answer is D
Explanation
A. Smoking: Correctly known to be teratogenic; can lead to low birth weight, preterm birth, and other anomalies.
B. Alcohol: Highly teratogenic; causes fetal alcohol spectrum disorders.
C. Infectious diseases: Examples like rubella and Zika are known teratogens.
D. Sunlight: Normal sunlight exposure is not teratogenic; only excessive UV exposure may pose skin risks, not fetal deformities.
E. X-rays: Ionizing radiation is teratogenic, especially in early pregnancy.
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