Which of the following is accurate about hair cells in the ear? Synaptic vesicles fuse into the presynaptic cell and release 5HT inside it
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Hair cells are sensory cells located in the cochlea of the inner ear that convert sound vibrations into electrical signals. Show more…
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Which of the following correctly describes a characteristic property of hair cells that synapse on eighth nerve fibers? Answers A-E A. All work by generating low-frequency action potentials. B. Can produce both hyperpolarizing and depolarizing receptor potentials, depending on the direction in which stereocilia are deflected. C. Have stereocilia bathed in fluid with a very high sodium and low potassium concentration. D. Have stereocilia bathed in perilymph. E. Stereocilia have a high density of voltage-gated sodium channels.
Adi S.
The quantity of neurotransmitter that is released by a hair cell within the cochlea into the synapse with a sensory neuron will: 1) increase in response to any mechanical stimulation of the hair cell. 2) increase when the stereocilia of the hair cell are bent away from the tallest stereocilium. 3) increase when the stereocilia of the hair cell are bent towards the tallest stereocilium.
The ear and vestibular system rely on the same receptor type. Which of the following statements is INCORRECT? [1.5 marks] A In both senses, movement of fluid causes the relevant mechanical stimulus to activate hair cells B In the vestibular system (but not the inner ear), there are two types of hair cells. Outer hair cells change their length to fine-tune the properties of the inner hair cells C Tip links connect stereocilia so that all channels open when the stereocilia are bent D In both senses, hair cells have mechanically gated potassium channels E In the inner ear (but not the vestibular system), there are two types of hair cells. Outer hair cells change their length to fine-tune the properties of the inner hair cells
Madhur L.
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