Bio/Biochem · 3B

Organ systems

Content category 3B. 35 questions in 7 sets, each with reasoning for every answer choice.

Set 1 · Cardiovascular system

  1. Interpreting an arterial blood gashard
  2. The SA node as the cardiac pacemakereasy
  3. Calculating cardiac outputeasy
  4. The Frank–Starling mechanismmedium
  5. The baroreceptor reflex on standingmedium

Set 2 · Cardiovascular system

  1. Edema from low plasma albuminmedium
  2. Mean arterial pressure from CO and TPRmedium
  3. The cardiac action potential plateauhard
  4. Digoxin and cardiac contractilityhard
  5. Secretin vs. CCKeasy

Set 3 · Digestion

  1. Zymogen activation: pepsinogen vs. trypsinogenmedium
  2. Chylomicrons and dietary fatmedium
  3. Absorption of long-chain fatty acidsmedium
  4. MHC class I vs. class IIeasy
  5. Innate vs. adaptive immunityeasy

Set 4 · Immune system

  1. IgM in the primary immune responsemedium
  2. Why the secondary immune response is fastermedium
  3. T-cell selection in the thymusmedium
  4. Rh incompatibility and the first pregnancyhard
  5. Why conjugate vaccines work in infantshard

Set 5 · Renal system

  1. Rigor mortis: why ATP mattersmedium
  2. Smooth muscle contractionhard
  3. Glucose reabsorption in the proximal tubuleeasy
  4. Aldosterone vs. ADH in the kidneymedium
  5. The thick ascending limb of the loop of Henlemedium

Set 6 · Renal system

  1. Renin releasemedium
  2. Calculating renal clearancemedium
  3. Renal clearance greater than GFRhard
  4. Bohr effect: hemoglobin in exercising muscleeasy
  5. Pulmonary surfactanteasy

Set 7 · Respiratory system

  1. Fetal hemoglobin and 2,3-BPGmedium
  2. Carbon monoxide and oxygen deliverymedium
  3. Hyperventilation and acid–base balancemedium
  4. The main chemical drive to breathemedium
  5. Anemia: PaO₂, saturation, and oxygen contenthard