Following in vitro fertilization, if the zona pellucida remains unusually thick, which consequence follows, impeding successful pregnancy?

💡 Explanation

A thickened zona pellucida hinders the physical escape of the blastocyst, which is necessary for attachment to the uterine wall; this is termed impaired blastocyst hatching. Because the mechanical impediment of the zona inhibits implantation, rather than affecting sperm or early development, therefore option D is correct.

• If a patient with diabetes insipidus, characterized by insufficient ADH release, is given a synthetic ADH analog, desmopressin, which consequence affecting the collecting ducts follows?
• A patient's neurons show increased levels of insoluble protein aggregates. If intracellular proteasomal degradation is impaired, which consequence follows?
• Why does asthma often present with wheezing during exhalation?
• Why does signal transduction in a demyelinated neuron slow down action potential propagation following an initial stimulus?
• If a COX-2 selective inhibitor drug preferentially blocks prostaglandin E2 (PGE2) production in osteoarthritic joints, which consequence follows regarding cartilage remodeling?
• What happens to thyrotropin-releasing hormone (TRH) secretion when exogenous thyroid hormone (T4) is administered, mimicking hyperthyroidism?