Which of the following stimuli will not activate a nociceptor?
A. Specific chemicals in the extracellular fluid
B. Chemicals released by injured cells
C. External odorant molecules
D. Extremes in temperature
E. Very intense mechanical stimulation
Answer: C
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Four of the five answers are ways by which animals remove water and/or unwanted solutes. Select the exception
a. excretion in urine b. secretions c. exhalation d. elimination in feces e. bleeding
Pheromones
a. are signaling molecules. b. are released by one individual and influence other individuals of the same species. c. diffuse through the air d. help to regulate honeybee behavior. e. do all of these.
What is the fate of Meckel's Cartilage?
A. Degenerates completely, to be replaced by the mandible by membranous ossification. B. Degenerates partially, forming the proximal end of the mandible by endochondral ossification. C. Provides additional support to the mandible as it develops, and then degenerates. D. Serves as the cartilaginous template for the maxillary ossification. E. Serves as the cartilaginous template for the mandibular ossification.
Which part of the immune system's "learning system" is responsible for maintaining life-long immunity against measles after a measles infection?
a. somatic recombination c. affinity maturation b. clonal expansion d. retention of responding cells