The amount of glutamate release from photoreceptors of the vertebrateeye is highest whena. an animal is in full sunlight.b. an animal is in a completely dark place.c. an animal is in a dimly lit place.d. Na+ channels of the photoreceptors are closed.e. Both a and d are true.
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The amount of glutamate release from photoreceptors of the vertebrate
eye is highest when
a. an animal is in full sunlight.
b. an animal is in a completely dark place.
c. an animal is in a dimly lit place.
d. Na+ channels of the photoreceptors are closed.
e. Both a and d are true.
Step by step
Solved in 4 steps
- The dissociation of rhodopsin in the rods in response to light causes a.the Na+ channels to become blocked. b.the rods to secrete less neurotransmitter. c.the bipolar cells to become either stimulated or inhibited. d.all of these.Choose the best answer ? A receptor that detects changes in pH, or specific molecules in theenvironment, would be classified as a a. mechanoreceptor. d. thermoreceptor.b. photoreceptor. e. None of these are correct.c. chemoreceptor.Each of the following statements is false. Correct each statement to make it true. a. Activation of rhodopsin depolarizes photoreceptors. b. Activated rhodopsin activates transducin which deactivates cGMP phosphodiesterase. c. Cyclic GMP binds sodium channels, keeping them open, leading to the depolarization of photoreceptor in light.
- Which one of the following statements about photoreception is true? a. Light detection is initiated by the absorbance of light (a photon) by a photopigment molecule. b. Light detection is synonomous with vision. c. Light detection is always initiated in a rod photoreceptor located in the retina. d. Only light in the visible range (between 400 and 700 nm wavelength) can be detected by animals. e. None of the above answer choices (neither A, nor B, nor C, nor D) is true.A device that monitors the activity of the photoreceptor cells of the eye indicates that there is a constant flow of neurotransmitter being released by the photoreceptor cells. This information implies that the subject is a. reading. b. in a dark room. c. outside in sunlight. d. in a brightly lit auditorium. e. focusing on a distant object.When a single photon from a source of light hits the retina in the eye, it triggers a signal that travels along the optic nerve to the occipital lobe of the brain. The interaction of a photon with the photoreceptors in the retina first causes the movement of sodium ions into a sensory neuron. What happens after the movement of sodium ions? a. Sodium ions move out of a sensory neuron. b. Potassium ions move out of a sensory neuron. c. Sodium ions move into an interneuron. d. Potassium ions move into an interneuron.
- Which of the following about electric organs is FALSE? Select one: a. They are most effective in the sea as the salinity is high b. They have the ability to detect behaviours such as threat, submission and courtship C. They are most effective in the sea as the salinity is high d. They can detect sex and species of other fish e. They are common in freshwater fish that live in murky water or hunt at nightPhotoreceptors in the retina have special channels that are open to Na+ in the dark. When light hits photoreceptors, these special channels close. What can you cònclude from this? None of the above O Photoreceptors hyperpolarize to light Photoreceptors depolarize to light Photoreceptor voltage does not change in the presence of lightRegarding the sensation of various species, which of the following statements is false? A. The eyes of honeybees transduce parts of the electromagnetic spectrum that are invisible to humans B. Bats ears transduce sound waves that humans cannot hear C. Research has shown that the human eye transducers all of the electromagnetic spectrum to the brain, but the brain is unable to perceive it. D. Sharks have special organs that can sense the bioelectric fields of other living things
- Which of the following descriptions of photoreceptors in the eye is NOT correct? a. Cones are concentrated in the fovea of the retina and function to detect colours. b. Rods are concentrated at the periphery and function well in dim light. c. Rods are concentrated in the fovea of the retina and function well in dim light. d. Rods are sensitive to light and register black and white. Cones detect colours.At a normal NMJ, action potentials in the skeletal muscle cell can be blocked directly by? A. Curare, which inhibits nicotinic receptors. B. Atropine, which inhibits muscarinic receptors. C. Physostigmine, which inhibits ACHE. D. AP5, which inhibits NMDA receptors. E. Pentobarbital, which enhances the function of GABA on GABAA receptors.Sensory pathways of smell and taste a. are integrated with the advanced vomeronasal organ that humans possess b. begin with chemoreceptors c. begin in the somatosensory cortex d. are not involved in communication e. are completely separated from one another