Circular disc shaped structure with a round hole is ___________ ?
Correct answer: A. Iris
- A. Iris
- B. Pupil
- C. Horoid coat
- D. Ciliary body
Explanation
The iris is a circular muscular diaphragm containing a central opening called the pupil, and it regulates the amount of light entering the eye. The pupil itself is only the opening, not the disc-shaped structure, so students may choose pupil after focusing on the phrase “round hole.”
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About Receptors
Receptors are specialized cells or proteins that detect stimuli such as light, sound, pressure, temperature and chemicals, then initiate responses through sensory or hormonal pathways. Questions distinguish sensory receptors from effectors, compare receptor types, and examine stimulus conversion into nerve impulses, including the roles of rods, cones, chemoreceptors and mechanoreceptors.
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