NDA Biology
Human Physiology — Quiz
20 Questions · No Negative Marking
Question 1
Which ion gradient across the axon membrane is primarily responsible for generating the resting membrane potential?
AHigh Na⁺ inside, low Na⁺ outside
BHigh K⁺ inside, low K⁺ outside (maintained by Na⁺/K⁺ ATPase)
CHigh Ca²⁺ inside, low Ca²⁺ outside
DHigh Cl⁻ inside, low Cl⁻ outside
Question 2
During the sliding filament mechanism of muscle contraction, which protein moves relative to which?
AMyosin filaments slide over actin filaments, shortening the H zone
BActin (thin) filaments slide over myosin (thick) filaments, shortening the sarcomere
CThe sarcolemma contracts pulling myosin inward
DTitin filaments extend to pull actin toward the M line
Question 3
The Frank-Starling law of the heart states that:
AHeart rate increases proportionally with blood pressure
BThe force of cardiac contraction increases with increased ventricular filling (preload)
CStroke volume decreases when venous return increases
DCardiac output equals blood pressure divided by heart rate
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