Myofibrils contain
a) contractile proteins.
b) regulatory proteins.
c) structural proteins.
d) all of these answers are correct.
e) none of these answers are correct.
d
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Color vision has much greater resolution than night vision (vision that is mostly in shades of gray). Which of the following is the best explanation for why this is so?
A) A single cone photoreceptor often connects to a single bipolar cell and a single ganglion cell while as many as 100 rods will converge to a single ganglion cell. B) There are many more cone photoreceptors in the eye than rod photoreceptors. C) There are several types of cone photoreceptors, each of which enrich the clarity and resolution of vision. D) A larger proportion of the brain's visual cortex is active during the day when our cone photo receptors are most active.
The lining of the digestive tract plays a defensive role by protecting surrounding tissues against
A) mechanical stresses. B) the corrosive effects of acids. C) pathogens that are swallowed with food. D) the corrosive effects of digestive enzymes. E) All of the answers are correct.
The sternal angle can be used as an anatomical landmark to identify the position of the
A. jugular vein. B. trachea. C. hyoid bone. D. apex of the heart. E. second rib.
If someone had a cut in their skin through which a bacterium entered, but that bacterium was then destroyed by a neutrophil, this would be an example of
A. failed innate immunity, but successful adaptive immunity. B. failed external adaptive immunity, but successful innate immunity. C. failed external immunity, but successful internal acquired immunity. D. failed external innate immunity, but successful internal innate immunity.