While a photoreceptor responds to a single photon of light, a person cannot see a single photon. Explain.
What will be an ideal response?
Stimulation of a receptor is not sufficient to produce sensation that is perceived by the individual. The signals must be enough to allow a photoreceptor to alter neurotransmitter release enough to generate an action potential in the ganglion cell (which a single photon is not). In addition, even if there is a change in release of neurotransmitter, there is processing of visual signals within the retina (amacrine, horizontal and bipolar cells) and in the different brain areas to which that information travels. Thus, not all signals make it to the conscious brain—that is, a single photon is below the perceptual threshold of the visual system.
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A. Illegal drug use B. Smoking C. Drinking alcohol D. Regular exercise
Explain how modern birth control pills work as contraceptives.
What will be an ideal response?
Hyperventilating an apneic patient:
A) is appropriate if the patient is an adult. B) may decrease venous return to the heart. C) is beneficial if the pulse rate is too slow. D) reduces the incidence of gastric distention
The sarcoplasmic reticulum wraps like a sleeve around the myofibril and stores and releases calcium
Indicate whether the statement is true or false