D236 Test Bank: Key Questions & Answers Guide

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Western Governors University 

D236 Pathophysiology

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Study Guide Questions and Answers

Describe how your body responds to an infection

When an infection enters the body, the immune system initiates a coordinated defense involving both innate and adaptive mechanisms. Immune cells such as T lymphocytes secrete cytokines, which function as signaling molecules that regulate and amplify the immune response. These cytokines activate B lymphocytes, prompting them to differentiate into plasma cells that synthesize antibodies. Antibodies bind specifically to antigens on pathogens, neutralizing them directly or marking them for elimination by phagocytic cells. This integrated response not only clears the current infection but also establishes immunological memory that enhances protection against future exposures (Abbas et al., 2018).

Identify the role of DNA changes in congenital abnormalities

Congenital abnormalities arise primarily from alterations in genetic material that interfere with normal embryonic and fetal development. These alterations may include single-gene mutations, chromosomal aneuploidy, or structural rearrangements such as deletions and duplications. DNA changes can be inherited or occur de novo during gametogenesis or early cell division. When genes essential for organogenesis or cellular differentiation are disrupted, the result may be structural malformations or functional impairments evident at birth (Moore et al., 2020).

How does development disrupt congenital abnormalities?

Normal development depends on precisely timed gene expression and signaling pathways. Genetic abnormalities during critical developmental windows can disrupt processes such as cell migration, tissue folding, and organ formation. For example, impaired closure of the neural tube during early gestation can result in neural tube defects. These disruptions alter developmental trajectories, producing congenital conditions that may range from mild anatomical variations to severe functional disabilities (Sadler, 2019).

Describe factors that disrupt homeostasis and how disruptions affect wellbeing

Homeostasis maintains internal physiological stability through regulatory mechanisms involving the nervous, endocrine, and renal systems. Factors such as dehydration, electrolyte imbalance, infection, or chronic disease can disrupt this balance. Alterations in sodium, potassium, or fluid volume affect neuromuscular activity, cardiovascular function, and cellular metabolism. Persistent homeostatic imbalance compromises organ function and increases morbidity if corrective mechanisms fail (Hall & Guyton, 2021).

Explain RAAS (Renin-Angiotensin-Aldosterone System)

The Renin-Angiotensin-Aldosterone System (RAAS) is a hormonal cascade essential for blood pressure regulation and fluid balance. Reduced renal perfusion stimulates renin release, leading to the formation of angiotensin II through enzymatic conversion. Angiotensin II induces vasoconstriction and triggers aldosterone secretion, promoting renal sodium and water reabsorption. Together, these effects restore circulating volume and arterial pressure during hypotensive states (Klabunde, 2017).

Diabetic Ketoacidosis (DKA)

Diabetic ketoacidosis is an acute metabolic complication caused by insulin deficiency, resulting in uncontrolled lipolysis and ketone body formation. Accumulation of ketones leads to metabolic acidosis characterized by decreased bicarbonate levels and an elevated anion gap. Clinical manifestations include dehydration, tachypnea, and altered mental status, requiring immediate medical intervention (Kitabchi et al., 2009).

How do kidneys compensate for alkalosis?

During alkalosis, the kidneys adjust acid-base balance by increasing bicarbonate excretion and conserving hydrogen ions. These renal mechanisms gradually reduce blood pH toward normal levels. Although renal compensation occurs more slowly than respiratory responses, it is essential for long-term acid-base regulation (Rose & Post, 2001).

Untreated acidosis leads to an increase in which electrolyte?

Persistent acidosis typically results in elevated serum potassium levels. As hydrogen ions move into cells to buffer excess acid, potassium ions shift into the extracellular fluid. This electrolyte imbalance increases the risk of cardiac arrhythmias and neuromuscular dysfunction (Adrogué & Madias, 2000).

Infectious Diseases Overview

Obesity and Diabetes as Risk Factors for Having a Child with Spina Bifida

Maternal metabolic disorders such as obesity and diabetes increase the risk of neural tube defects by interfering with glucose regulation and folate metabolism during early embryogenesis. Adequate glycemic control and folic acid supplementation prior to conception significantly reduce this risk (Miller et al., 2010).

Trousseau’s Sign

Trousseau’s sign is a diagnostic indicator of hypocalcemia, elicited by inflating a blood pressure cuff to induce carpal spasm. It reflects increased neuromuscular excitability due to low serum calcium levels (Koul et al., 2017).

Cause and Sign of Spina Bifida

Spina bifida is caused by incomplete neural tube closure during early gestation. A common sign is a protruding sac along the lower spine, which may contain meninges and neural tissue. Severity varies depending on the extent of spinal involvement (Wallingford et al., 2013).

Hemophilia is More Common in Males

Hemophilia follows an X-linked recessive inheritance pattern. Males are more frequently affected due to possessing a single X chromosome, whereas females are typically asymptomatic carriers (Mannucci & Tuddenham, 2001).

Prenatal Exposure to Alcohol: ND-PAE, Decreased Brain Function, FAS

Alcohol exposure during pregnancy disrupts fetal neurodevelopment, leading to conditions such as ND-PAE and Fetal Alcohol Syndrome. These disorders are characterized by cognitive impairment, behavioral abnormalities, and characteristic facial features. Complete abstinence during pregnancy is the primary preventive strategy (May & Gossage, 2011).

Connective vs. Muscle Tissue Disorders

Autoimmune and Musculoskeletal Disorders

Lupus is a systemic autoimmune disease marked by chronic inflammation affecting joints, skin, and internal organs. Myasthenia gravis involves antibody-mediated disruption of neuromuscular transmission, resulting in activity-dependent muscle weakness (Tsokos, 2011; Gilhus, 2016).

Skin Disorders and Neoplasms

Dermatitis and eczema are inflammatory skin conditions characterized by erythema and pruritus, while decubitus ulcers result from prolonged pressure impairing tissue perfusion. Neoplasms may be benign, exhibiting localized growth, or malignant, demonstrating invasive and metastatic potential (Weinberg, 2014).

Bone and Joint Disorders

Osteoporosis involves reduced bone density, whereas osteomalacia and rickets result from defective mineralization due to vitamin D deficiency. Degenerative disk disease and Paget’s disease reflect abnormal bone remodeling processes (Holick, 2007; Ralston & Albagha, 2014).

D236 Test Bank: Key Questions & Answers Guide

Three Types of Skin Cancer

Neurologic and Sensory Disorders

Ischemic strokes result from vascular occlusion, while hemorrhagic strokes involve intracranial bleeding. Alzheimer’s disease primarily affects cognition, whereas Parkinson’s disease impairs motor function. Huntington’s disease is inherited and causes progressive neurodegeneration (Querfurth & LaFerla, 2010; Walker, 2007).

Sexually Transmitted Diseases and Disorders