Physiology ​Image Based Questions for NEET PG 2026

Q1. In the image given below what does the yellow curve represent?​

1. Normal lung function
2. Obstructive lung disease
3. Restrictive lung disease
4. Respiratory failure​

Ans. 2) Obstructive lung disease

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Q2. A patient underwent pulmonary function testing, and the flow-volume loop is shown below. What does it show?

1. Fixed upper airway obstruction
2. Variable intra-thoracic obstruction
3. Normal lung functioning
4. None of the above

​Ans. 1) Fixed upper airway obstruction 

Q3. Analyze the following flow volume loop diagram. Which of the following statements is NOT true regarding this flow volume loop?​

1. ​The loop demonstrates flatness in the expiratory portion
2. This loop occurs in variable intrathoracic obstruction
3. The "box pattern" indicates fixed upper airway obstruction.
4. The loop shows a reduction in peak expiratory flow (PEF) due to the obstruction.  

Ans. 3) The "box pattern" indicates fixed airway obstruction.​

Q4. Which of the following does this Darrow-Yannet diagram (Solid line represent the controlled condition and broken red-line indicate new-steady state condition) represent?​

1. Excessive NS infusion
2. Excessive infusion of hypertonic saline
3. Diarrhea
4. Diabetes insipidus

Ans. 3) Diarrhea

Q5. The graph below depicts an action potential. Which of the following statements correctly describes the state of ion channels at the point marked "X" on the graph?​

1. Na+ channels are closed; K+ channels are open.
2. Na+ channels are completely inactivated; K+ channels are open.
3. Na+ and K+ channels are open.
4. Na+ and K+ channels are closed.​​

 Ans. 2) Na+ channels are inactivated; K+ channels are open.

Q6. Based on the graph showing potassium ion permeability during an action potential, at which point does the permeability of potassium ions reach its peak?​

1. ​Point A
2. Point C
3. Point D
4. Point F

Ans. 3) Point D

Q7. Given below is the action potential of a cardiac muscle fiber. Which of the following gives rise to Phase 2 depicted in the image?

1. Closure of Na+ channels and opening of K+ channel
2. Closure of the Ca2+ channels and a slow, delayed increase of K+ efflux
3. Opening of voltage-gated Na+ channels.
4. Opening of slow L-type voltage-gated Ca2+ channels and efflux of K+ though rectifier channels.​

 Ans. 4) Opening of slow L-type voltage-gated Ca2+ channels and efflux of K+ though rectifier channels

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Q8. A 45-year-old patient needs an urgent blood transfusion. The image below shows the results of the patient’s blood group typing test. Based on the agglutination patterns observed, identify the patient's blood group?​

1. ​O positive(O+ve)
2. A positive (A-ve)
3. AB positive (AB+ve)
4. B positive (B+ve)

Ans. 3) AB positive (AB+ve)

Q9. Which part of the proximal tubule is the most vulnerable and prone to ischemia? ​

1. ​S1
2. S2
3. S3
4. S2 & S3

Ans. 3) S3

Q10. While flowing through which of the following segments does the filtrate become progressively hypertonic compared to plasma?​

1. D
2. A
3. B
4. C

Ans. 3) B

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Q11. As illustrated below, in examining the effects of presynaptic inhibition and facilitation on action potentials, Ca²⁺ currents, and EPSPs (excitatory postsynaptic potential), which statement regarding the dashed line recordings is false?​

(solid lines for controls; dashed lines for inhibition/facilitation)

1. ​It can be produced by opening of voltage gated K+ channel
2. Produced due to enhanced Ca2+ entry in the presynaptic neuron.
3. The effect is produced by GABA
4. Produced due to increased Cl− conductance

 Ans. 2) Produced due to enhanced Ca2+ entry in the presynaptic neuron. 

Q12. Which of the following best describes the sequence of events in the stretch reflex pathway?​

1. ​Spinal cord → Muscle spindle → α-motor neuron → Muscle contraction
2. Muscle spindle → Spinal cord → α-motor neuron → Muscle contraction
3. Spinal cord→ α-motor neuron →Muscle spindle →Muscle contraction
4. Muscle spindle →α-motor neuron → Spinal cord → Muscle contraction

Ans. 2) Muscle spindle → Spinal cord → α-motor neuron → Muscle contraction ​

1. ​Pacinian corpuscle
2. Meissner’s corpuscle
3. Merkel’s disc
4. Ruffini’s ending​

Ans. 3) Merkel’s disc 

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Q14. Action potentials in an afferent fiber from a mechanoreceptor of a single sensory unit is recorded in response to pressure stimulus. Which of the following principle is shown here:​

1. Labelled line principle
2. Weber-Fechner Law
3. Frequency coding principle
4. Concept of specific nerve energy

​​Ans. 3) Frequency coding principle 

Q15. What is the location and the number of taste buds approximately present in the image given below

1. ​Up to 100, two lateral ends of the tongue
2. Up to 5, base of the tongue
3. Up to 100, tip of the tongue
4. Up to 25, base of the tongue

Answer: (A) Up to 100, two lateral ends of the tongue

Q16. Identify the labelled structures A, B, C, and D in the auditory pathway diagram.​

1. ​A: Inferior colliculus, B: Superior olivary nucleus, C: Dorsal cochlear nucleus, D: Medial geniculate body
2. A: Inferior Colliculus, B: Lateral lemniscus, C: Superior olivary nucleus, D: Ventral cochlear nucleus
3. A: Inferior Colliculus, B: Lateral Lemniscus, C: Superior olivary nucleus, D: Trapezoid Body
4. A: Primary auditory area, B: Lateral lemniscus, C: Superior olivary nucleus, D: Spiral ganglion

Ans. 3) A: Inferior Colliculus, B: Lateral Lemniscus, C: Superior olivary nucleus, D: Trapezoid Body

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