2026/2027 Biology 30 Alberta: The Senses Questions and Answers (Rated A+)

2026/2027 Biology 30 Alberta: The Senses Questions and Answers (Rated A+) How are stimuli detected? -Answer By sensory receptors How does sensation occur? -Answer Electrochemical impulses arrive at cerebral cortex Sensory adaptation -Answer Process by which repeated, insignificant signals are filtered out What do photoreceptors do? -Answer Detect light (e.g. rods and cones in human eye) What do chemoreceptors do? -Answer Detect chemical signals (e.g. olfactory cells for smell, taste buds, internal detection of pH levels, etc.) What do mechanoreceptors do? -Answer Detect varying forms of pressure (e.g. hair cells in ear for sound waves, proprioceptors for muscle posture and orientation, etc.) What do thermoreceptors do? -Answer Differentiate between hot from cold temperatures What is the iris? -Answer Pigmented part of the eye that surrounds the pupil. Constricts/dilates, changing size of pupil depending on amount of light What is the lens of the eye? -Answer Located behind pupil, is biconvex, transparent, and avascular. Ciliary muscles and suspensory ligaments change shape of lens to focus light on the retina