Physiological Mechanisms Regulating Blood Pressure
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Questions and Answers

Which mechanism controls the arterial blood pressure by adjusting vascular capacity and resistance as well as blood volume?

  • Peripheral chemoreceptor reflexes (correct)
  • Cushing's reflex
  • Central nervous system ischemic response
  • Efferent impulses to the SA node
  • Which hormone has potent diuretic and natriuretic effects on the kidneys?

  • Vasopressin
  • Atrial natriuretic peptide (ANP) (correct)
  • Cortisol
  • Thyroxine
  • Which reflex is activated by the reduction in partial pressure of oxygen (PaO2) and leads to vasoconstriction to increase blood pressure back to normal?

  • Central nervous system ischemic response
  • Peripheral chemoreceptor reflexes (correct)
  • Cushing's reflex
  • Efferent impulses to the SA node
  • Which mechanism causes vasoconstriction to increase blood pressure back to normal proportional to the increase in intracranial pressure?

    <p>Cushing's reflex</p> Signup and view all the answers

    Which gland decreases the secretion of vasopressin (antidiuretic hormone) to increase urine output and decrease blood volume and pressure?

    <p>Pituitary gland</p> Signup and view all the answers

    Which mechanism involves an increase in blood volume leading to increased capillary hydrostatic pressure and subsequent fluid filtration into tissue spaces?

    <p>Capillary fluid shift mechanism</p> Signup and view all the answers

    Which of the following hormones or hormone systems is involved in the hormonal regulation of arterial blood pressure?

    <p>Catecholamines and renin-angiotensin system</p> Signup and view all the answers

    Which mechanism adjusts the body's fluid and blood volumes to control arterial blood pressure?

    <p>Renal-body fluid mechanism</p> Signup and view all the answers

    A decrease in arterial blood pressure leads to a reduction in which of the following, which subsequently decreases urine flow and salt excretion?

    <p>Glomerular filtration rate</p> Signup and view all the answers

    Which hormone is secreted in response to a decrease in arterial blood pressure and promotes sodium reabsorption by the kidneys?

    <p>Aldosterone</p> Signup and view all the answers

    Which of the following is NOT a short-term mechanism for regulating arterial blood pressure?

    <p>Renin-angiotensin-aldosterone system</p> Signup and view all the answers

    What is the primary function of the arterial baroreceptor reflexes?

    <p>To maintain arterial blood pressure within a normal range</p> Signup and view all the answers

    Which of the following statements about the capillary fluid shift mechanism is correct?

    <p>It involves the movement of fluid between the capillaries and the interstitial space</p> Signup and view all the answers

    How does an increase in arterial blood pressure affect the glomerular filtration rate (GFR)?

    <p>It decreases GFR by constricting the efferent arterioles</p> Signup and view all the answers

    Which hormone plays a key role in the long-term regulation of arterial blood pressure by promoting sodium and water reabsorption in the kidneys?

    <p>Aldosterone</p> Signup and view all the answers

    Which of the following is NOT a factor that determines peripheral resistance?

    <p>Heart rate</p> Signup and view all the answers

    What is the primary mechanism by which adjusting arteriolar diameter affects arterial blood pressure?

    <p>By altering peripheral resistance</p> Signup and view all the answers

    Which of the following statements about the relationship between cardiac output and blood pressure is TRUE?

    <p>Increasing stroke volume raises systolic blood pressure more than diastolic blood pressure.</p> Signup and view all the answers

    Which hormone is primarily responsible for regulating the glomerular filtration rate and, consequently, blood pressure?

    <p>Angiotensin II</p> Signup and view all the answers

    What is the primary mechanism by which aldosterone regulates blood pressure?

    <p>By increasing sodium and water reabsorption in the kidneys</p> Signup and view all the answers

    What is the primary cause of essential hypertension?

    <p>Genetic polymorphisms</p> Signup and view all the answers

    Which factor is NOT associated with the mechanisms of established hypertension?

    <p>Genetic mutations</p> Signup and view all the answers

    What is the effect of sustained diastolic pressures exceeding 90 mm Hg?

    <p>Increased risk for atherosclerosis</p> Signup and view all the answers

    In patients with systolic pressures between 140 and 159 mm Hg, what must be considered when deciding on treatment?

    <p>Other contributing factors</p> Signup and view all the answers

    What is the basic mechanism for established hypertension?

    <p>Increased vascular resistance</p> Signup and view all the answers

    What is the most common cause of secondary hypertension related to increased activity of the renin-angiotensin system?

    <p>Renal disease</p> Signup and view all the answers

    Which pathological consequence of raised arterial pressure is marked by homogeneous, pink hyaline thickening of arteriolar walls, leading to luminal narrowing?

    <p>Hyaline arteriolosclerosis</p> Signup and view all the answers

    In the kidneys, the arteriolar narrowing caused by hyaline arteriosclerosis leads to what condition characterized by glomerular scarring?

    <p>Nephrosclerosis</p> Signup and view all the answers

    Which of the following conditions results in thickening of the media layer of muscular arteries due to smooth muscle hyperplasia and collagen deposition?

    <p>Hypertension</p> Signup and view all the answers

    What selective response to hypertension includes thickening of the media layer of muscular arteries and collagen deposition in small arteries and arterioles?

    <p>Hyaline arteriolosclerosis</p> Signup and view all the answers

    What is the pathological consequence of long-standing systemic hypertensive heart disease leading to congestive failure?

    <p>Left ventricular hypertrophy</p> Signup and view all the answers

    Which condition is characterized by marked concentric thickening of the left ventricular wall causing a reduction in lumen size?

    <p>Systemic hypertensive heart disease</p> Signup and view all the answers

    What may be the heart weight in individuals with long-standing systemic hypertensive heart disease?

    <p>500 g or more</p> Signup and view all the answers

    What is the major effect of increased left ventricular wall thickness in systemic hypertensive heart disease?

    <p>Left atrial dilation</p> Signup and view all the answers

    What is the primary pathological feature of chronic cor pulmonale?

    <p>Right ventricular dilation and hypertrophy</p> Signup and view all the answers

    Which pathological change is described as exhibiting 'onion skin', concentric, laminated thickening of arteriolar walls and luminal narrowing?

    <p>Hyperplastic arteriolosclerosis</p> Signup and view all the answers

    Which vascular disorder is NOT mentioned as being associated with hypertension?

    <p>Myocardial infarction</p> Signup and view all the answers

    What percentage of ischemic heart disease is attributed to inadequate management of hypertension, according to the given information?

    <p>49%</p> Signup and view all the answers

    Which of the following is NOT a consequence of persistent hypertension on the heart, as described in the text?

    <p>Myocardial ischemia</p> Signup and view all the answers

    According to the information provided, what cellular change occurs in the myocardium as an adaptive response to pressure overload due to hypertension?

    <p>Sarcomeres are added in parallel to existing sarcomeres</p> Signup and view all the answers

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