Receptors Quiz
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5 questions, one answer each
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1. Which ion movement causes the generator potential in a Pacinian corpuscle?
- A. Potassium ions out
- B. Sodium ions in through stretch-mediated channels
- C. Calcium ions in through voltage-gated channels
- D. Sodium ions out by active transport
2. A very light touch fails to produce an impulse in a sensory neurone. Why?
- A. The generator potential is below the threshold
- B. Pacinian corpuscles respond only to light
- C. Sodium ions cannot enter the neurone
- D. The action potential is too large
3. Why is the fovea best for reading small print?
- A. It contains rods that share a bipolar neurone
- B. It contains rhodopsin
- C. Each cone has its own bipolar neurone so points of light are seen separately
- D. It is very sensitive in dim light
4. Why are rods more sensitive than cones in dim light?
- A. They contain iodopsin
- B. Their generator potentials summate at a shared bipolar neurone
- C. They are found in the fovea
- D. They have their own bipolar neurone
5. A person with a faulty type of cone cannot distinguish red from green. Why does the brain fail to tell them apart?
- A. Rods become more active
- B. Rhodopsin is broken down too slowly
- C. The optic nerve is too short
- D. It cannot compare the proportions of stimulation of three cone types