Which of the following statements is not true about neurons? When there is no active nerve impulse, the concentration of Na+ ions outside of the cell is greater than inside the cell After a nerve impulse passes a region of the axon, that region will not be able to carry another impulse again for a brief period of time When a nerve impulse occurs, sodium channels in the axon open first, followed by potassium channels The inside of an axon is typically negatively charged compared to the outside of an axon The cell uses energy to actively pump Na+ ions into the axon and K+ ions out of the axon
Anatomy and Physiology of Special Sensory Organs
Sensory organs can be labeled as special sensory structures that permit sight, hearing, odor, and flavor. Sensory structures permitting proprioception, touch, thermal, and pain perception can be classified as more advanced sensory organs. The sensory neurons are trained to find out modifications in the external and internal conditions so that a person's body can react to that change. A stimulus is the first signal that is recognized by any sensory receptor of the body. Stimulus is an impulse generated when there is a change in the surroundings of a person. For example, a heated environment will alert the brain through the thermal sensory organs and generate a reflex accordingly.
Sensory Receptors
The human sensory system is one of the most complex and highly evolved structures, which processes a myriad of incoming messages. This well-coordinated system helps an organism or individual to respond to external stimuli, appropriately. The sensory receptors are an important part of the sensory system. These receptors are specialized epidermal cells that respond to external environmental stimuli. These receptors consist of structural and support cells that form the peripheral unit of the receptor and the neural dendrites which receive and detect the external stimuli.
Which of the following statements is not true about neurons?
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When there is no active nerve impulse, the concentration of Na+ ions outside of the cell is greater than inside the cell
-
After a nerve impulse passes a region of the axon, that region will not be able to carry another impulse again for a brief period of time
-
When a nerve impulse occurs, sodium channels in the axon open first, followed by potassium channels
-
The inside of an axon is typically negatively charged compared to the outside of an axon
-
The cell uses energy to actively pump Na+ ions into the axon and K+ ions out of the axon.
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