The 10 Highest-Frequency Errors (With Corrections)

Error 1 — Resting Potential Sign: Wrong: +70 mV. Correct: -70 mV. The INSIDE is negative at rest. This error appears in ~40% of incorrect answers for this topic.

Error 2 — Cerebellum Function: Wrong: "Cerebellum initiates voluntary movements." Correct: Cerebrum INITIATES; cerebellum COORDINATES. This distinction alone accounts for 2-3 NEET questions per year.

Error 3 — Na+/K+ Pump Ratio: Wrong: 2 Na+ out, 3 K+ in. Correct: 3 Na+ OUT, 2 K+ IN. The larger number (3) goes outward (Na+), smaller (2) comes inward (K+).

Error 4 — Ion for Depolarization vs Repolarization: Wrong: K+ in causes depolarization. Correct: Na+ IN = depolarization; K+ OUT = repolarization. Students must know both the ion AND its direction.

Error 5 — Stapes Location: Wrong: Stapes connects to the round window. Correct: Stapes → OVAL window. The round window is a pressure-relief valve, not the input.

Error 6 — Rods vs Cones (Pigment Swap): Wrong: Rods contain iodopsin; cones contain rhodopsin. Correct: Rods = Rhodopsin; Cones = iodopsin. Memory: "R for Rods, R for Rhodopsin."

Error 7 — Myopia Lens: Wrong: Myopia corrected by convex lens. Correct: Myopia = concave (−). Hypermetropia = convex (+).

Error 8 — Thalamus Relays All Senses: Wrong: "Thalamus relays all sensory information." Correct: ALL senses EXCEPT SMELL bypass the thalamus.

Error 9 — Number of Spinal Nerves: Wrong: 28 or 32 pairs. Correct: 31 pairs (8C + 12T + 5L + 5S + 1Cx = 31).

Error 10 — Cerebellar Damage = Paralysis: Wrong: "Cerebellar damage causes paralysis." Correct: Cerebellar damage → ATAXIA (incoordination). Paralysis indicates cerebrum/corticospinal pathway damage.