A patient's blood pressure rises significantly when a medication constricts efferent arterioles in the kidneys. Which mechanism explains this hypertensive effect?

💡 Explanation

The blood pressure rises because vasoconstriction of efferent arterioles increases pressure within the glomerulus. The increased glomerular filtration raises systemic blood pressure due to the renin-angiotensin system; therefore, increased glomerular pressure explains the hypertension, rather than reduced sodium reabsorption or altered hormone levels.

• A researcher observes that neutrophils exposed to interferon-gamma (IFN-γ) exhibit enhanced phagocytosis of Staphylococcus aureus. Why does this occur in the immune response?
• Why does steatorrhea (excess fat in feces) occur in individuals with cystic fibrosis, despite normal dietary fat intake?
• An individual consumes excessive salt, disrupting electrolyte balance. Which mechanism explains why increased water reabsorption occurs in the kidney's collecting duct?
• A patient with a thyroid tumor exhibits chronically elevated TSH levels despite high doses of exogenous thyroxine. What explains why thyroxine fails to suppress TSH secretion?
• Which downstream consequence results after sustained cardiac muscle cell hypoxia?
• Why does prolonged occlusion of skin via bandages promote opportunistic fungal infection?