You are sitting on a sunny Florida beach experiencing the sensation of warmth. Describe the anatomical structures and physiological events that allow you to perceive the warmth of the sun
What will be an ideal response
Thermoreceptors, which are distributed throughout the skin, must be present to sense the thermal stimuli. The warmth from the sun stimulates the warm thermoreceptors to become activated by warming the receptive field of thermoreceptors and stimulating the production of graded potentials. When the graded potentials reach threshold, they trigger nerve impulses in the themoreceptor, which serves as a first order neuron that transmits the information to the CNS where a second order neuron conducts impulses via neurons of the spinothalamic tract to the thalamus. From the thalamus, third order neurons conduct impulses to the primary somatosensory area of the cerebral cortex where the impulses are perceived as a feeling of warmth.
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Which of the following statements is not true of the cerebellum?
A) It helps regulate water balance and sleep cycles. B) It is responsible for sensory and motor coordination and balance. C) It is considered the "little brain." D) It lies under the occipital lobe of the cerebrum.
What chemical binds free hydrogen ions in solution?
What will be an ideal response?
A synovial membrane
A) secretes serous fluid. B) is very thick with many layers of cells. C) secretes synovial fluid. D) secretes mucus.
Gustatory receptors are sensitive to dissolved chemicals but insensitive to light. This is due to
A) receptor specificity. B) accessory cells. C) the fact that they are interoceptors. D) receptor potentials. E) both accessory cells and the fact that they are interoceptors.