NUR 631 – Midterm Exam Study Guide 2023

NUR 631 – Midterm Exam Study Guide 2023. Tumor progress from benign to malignant (364-366) o Benign tumors are usually encapsulated and well differentiated. They retain some normal tissue structure and do not invade the capsules surrounding them or spread to regional lymph nodes or distant locations. ▪ Generally named according to the tissues from which they arise, and include the suffix –oma. o Some benign tumors can progress to cancer and are then referred to as malignant. They have more rapid growth rates and specific microscopic alterations, including loss of differentiation and absence of normal tissue organization. ▪ One hallmark is anaplasia – loss of cellular differentiation, irregularities of the size and shape of the nucleus, and the loss of normal tissue structure. ▪ May present with different degrees of encapsulation; some lack a capsule, and even if one is apparent, it’s integrity has been compromised so that tumor cells can grow to invade nearby blood vessels, lymph and surrounding structures. ▪ Most deadly characteristic is their ability to spread far beyond the tissue of origin – metastasis 2 Genetics • Recurrence of autosomal diseases (152-154, 155-156) o Autosomal dominant - Affected offspring are produced by the union of a normal parent with an effected heterozygous parent ▪ Affected parent can pass either a disease gene or a normal gene to his or her children ▪ Each event has a probability of 0.5, so on average half the children will be normal and half will express the disease. o Autosomal recessive – individual must be homozygous for a recessive allele to express the disease – can survive the population one generation to the next ▪ Characterized by delay of onset, incomplete penetrance, and variable expressivity – most common is cystic fibrosis ▪ Recurrence risk for the offspring of carrier parents is 25%