Concept explainers
To determine: The maximum peak absorption for the receptor that detects near-ultraviolet light in relation to the other photoreceptors.
Introduction: Ultraviolet light (UV light) is a kind of
Explanation of Solution
The wavelength of ultraviolet (UV) light is shorter than the blue light given in the figure. The peak absorption of the ultraviolet light would fall left to the peak absorption (which is, 420 nm) of the blue cone. According to the entire electromagnetic spectrum, the UV’s wavelength is between 10 nm and 400 nm. Therefore, the absorption peak that falls near 400 nm would be considered as the maximum absorption peak for “near-ultraviolet (NUV)”
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Chapter 43 Solutions
BIOLOGY
- For vertebrate photoreception, define: (a) photopigment; (b) photoreceptor; and (c) receptive field.arrow_forwardHow are Ca2+ channels involved in phototransduction? they cause neurotransmitter release even if no action potentials are produced are not affected by PDE activation in the outer segments when open, they lead to hyperpolarization in photoreceptors in darkness, they do not rely on CGMP levels The density of cones in the retina: is highest where cone outer segments increase in diameter is lowest where retinal blood vessels are absent is drastically less than that of rods in the fovea is indicative of what areas are associated with acuity The recycling of rhodopsin.arrow_forwardkey function of rod photoreceptors is to: detect colors detect fine details in the visual field. detect light under low levels of illumination. detect light under high levels of illumination. During phototransduction, transducin activates phosphodiesterase (PDE) that converts: GTP to GDP CGMP to GMP retinal cis to retinal trans retinal trans to retinal cisarrow_forward
- Activated Müller glia (MG) are capable of producing which of the following cell types in the zebrafish's retina? Iris Cells capillary endothelial cells Lens cells rods bipolar cells horizontal cells ganglion cellsarrow_forwardReceptor cells that are neurons with sensory dendrites are faster than receptor cells that are separate from neurons. Why is that, and why might that be important in, for example, the sense of touch versus vision?arrow_forwardThe discharge rate of an off-center ganglion cell: is not an absolute measure of light intensity does not depend on the background level of illumination O is highest when receptive field is in complete darkness O is the same for center-only and center-plus-surround illumination Which of the following terms are most suitably matched? Pitch, waveform Loudness, amplitude Frequency, pressure Tonotopy, phasearrow_forward
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- In order to see a dim star at night, it is better not to look directly at it. If you see it from the “corner of your eye” and then turn to look at it, it may disappear. Explain how this occurs. Also, you can staredirectly at an object in daylight and continue seeing it, despite the bleaching of photoreceptors. Explain how this is possible.arrow_forwardBased on the same attached figure as above (Figure 10.9 in your textbook), what kind of channel permits K+ to pass through the apical-end membrane in hair cells of the ear? (A) Spiral ganglion Tectorial membrane Scala vestibuli Inner hair cells -45 mV Scala tympani Outer hair cells Scala media Organ of Corti Perilymph Low K+ 0mV Endolymph High K+ +80 mV (B) Stria vascularis Basilar membrane Ca²+ Afferent. nerve Depolarization O Nucleus wwww. 00 -Depolarization. Vesicles -Transmitter To brain C₂24arrow_forwardPut the following steps in order for transduction for vision. Question options: PDE breaks down cyclic GMP Photon is absorbed by discs the photoreceptor hyperpolarizes Sodium channels are inactivated and the dark current stops Opsin is activated Phosphodiesterase (PDE) is activated Transducin is activatedarrow_forward
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