What is an orphan receptor?
What will be an ideal response?
a receptor that has no known ligand
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Suppressor T cells act to
A) suppress antigens. B) erase memory T cells. C) limit antigen proliferation. D) inhibit T and B cell activities. E) produce antibodies involved in autoimmunity.
As a result of a sudden increase in the blood pressure, the baroreceptors signal a(n) ___ in sympathetic outflow, which results in a(n) ___ in peripheral resistance and return of blood pressure to normal.
a. increase, decrease b. decrease, increase c. increase, increase d. decrease, decrease
Cy Dill noticed that when he traveled from his home at 1,100 ft. elevation, to hike in the forest at 8,000 ft. elevation, his respiratory rate was elevated even while he was resting. This is because
A. the partial pressure of carbon dioxide is greater at higher elevations. B. the partial pressure of oxygen is lower at higher elevations. C. the air is "thinner" at higher elevations. D. his proprioceptors were stimulating his respiratory center. E. there would be a decrease in blood pH at that altitude.
Describe the three types of skin grafts. Which one is best? Why?
What will be an ideal response?