Receptors in Humans – Important MCQs with Answers

Receptors are specialized structures in the human body that detect different kinds of stimuli and help us respond to the environment. They play a vital role in sensory perception such as vision, hearing, smell, taste, touch, balance, pain, and temperature detection. Below is a collection of the 25 most important and repeated multiple-choice questions (MCQs) on receptors in humans with answers.

MCQs on Receptors in Humans

1. Receptors are specialized structures that detect:
a) Hormones
b) Stimuli
c) Enzymes
d) Blood cells
Answer: b) Stimuli

2. Which receptors are present in the retina of the human eye?
a) Rods and cones
b) Pacinian corpuscles
c) Meissner’s corpuscles
d) Thermoreceptors
Answer: a) Rods and cones

3. The receptors for hearing are located in:
a) Cochlea
b) Semicircular canals
c) Utriculus
d) Sacculus
Answer: a) Cochlea

4. Pacinian corpuscles are receptors for:
a) Touch
b) Pressure and vibration
c) Temperature
d) Smell
Answer: b) Pressure and vibration

5. Thermoreceptors are sensitive to:
a) Sound
b) Smell
c) Heat and cold
d) Light
Answer: c) Heat and cold

6. Olfactory receptors are located in:
a) Tongue
b) Nasal epithelium
c) Cochlea
d) Skin
Answer: b) Nasal epithelium

7. Taste buds act as:
a) Photoreceptors
b) Chemoreceptors
c) Mechanoreceptors
d) Thermoreceptors
Answer: b) Chemoreceptors

8. Meissner’s corpuscles are found in the skin and detect:
a) Temperature
b) Light touch
c) Pain
d) Smell
Answer: b) Light touch

9. Pain receptors are also called:
a) Nociceptors
b) Mechanoreceptors
c) Baroreceptors
d) Photoreceptors
Answer: a) Nociceptors

10. Balance in humans is maintained by receptors in:
a) Utricle and saccule
b) Retina
c) Pacinian corpuscle
d) Skin
Answer: a) Utricle and saccule

11. Which type of receptor detects changes in blood pressure?
a) Chemoreceptor
b) Baroreceptor
c) Mechanoreceptor
d) Photoreceptor
Answer: b) Baroreceptor

12. Cones in the human eye are responsible for:
a) Black and white vision
b) Color vision
c) Night vision
d) Pressure detection
Answer: b) Color vision

13. Rod cells contain a pigment called:
a) Opsin
b) Rhodopsin
c) Melanin
d) Carotene
Answer: b) Rhodopsin

14. Which receptors are absent in the fovea centralis of the eye?
a) Rods
b) Cones
c) Photoreceptors
d) None
Answer: a) Rods

15. Which receptors respond to chemical changes in blood (O₂ and CO₂ levels)?
a) Mechanoreceptors
b) Chemoreceptors
c) Baroreceptors
d) Nociceptors
Answer: b) Chemoreceptors

16. Vestibular apparatus receptors help in:
a) Smell
b) Vision
c) Hearing
d) Balance
Answer: d) Balance

17. The blind spot of the eye lacks:
a) Rods only
b) Cones only
c) Both rods and cones
d) Rhodopsin
Answer: c) Both rods and cones

18. Which of the following receptors is most numerous in the human body?
a) Photoreceptors
b) Nociceptors
c) Mechanoreceptors
d) Chemoreceptors
Answer: b) Nociceptors

19. Ruffini endings are receptors for:
a) Light touch
b) Cold
c) Heat and stretch
d) Pain
Answer: c) Heat and stretch

20. The receptor cells for taste are modified:
a) Epithelial cells
b) Muscle cells
c) Nerve cells
d) Cartilage cells
Answer: a) Epithelial cells

21. Photoreceptors convert light energy into:
a) Mechanical energy
b) Nerve impulse
c) Chemical energy
d) Sound energy
Answer: b) Nerve impulse

22. Which type of receptor is sensitive to gravity and motion?
a) Chemoreceptor
b) Mechanoreceptor
c) Vestibular receptors
d) Baroreceptors
Answer: c) Vestibular receptors

23. Which receptor is responsible for detecting smell?
a) Olfactory receptor
b) Gustatory receptor
c) Photoreceptor
d) Mechanoreceptor
Answer: a) Olfactory receptor

24. Which of the following is a stretch receptor in muscles?
a) Pacinian corpuscle
b) Muscle spindle
c) Meissner’s corpuscle
d) Ruffini ending
Answer: b) Muscle spindle

25. Which receptor is most important for night vision?
a) Rods
b) Cones
c) Pacinian corpuscles
d) Baroreceptors
Answer: a) Rods

Summary

  • Photoreceptors: Rods (night vision) and Cones (color vision).

  • Mechanoreceptors: Touch, pressure, vibration, balance.

  • Chemoreceptors: Smell, taste, blood O₂/CO₂ detection.

  • Thermoreceptors: Detect heat and cold.

  • Nociceptors: Pain detection.

  • Baroreceptors: Blood pressure regulation.

These MCQs provide a quick revision of the topic “Receptors in Humans” and are helpful for exam preparation.

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