When you hold your breath, which of the following leads to the urge to breathe?
a. Falling blood O2 concentration
b. Falling blood CO2 concentration
c. Rising blood CO2 concentration
d. Rising blood CO2 concentration and falling pH
e. Rising blood pH
Answer: d. Rising blood CO2 concentration and falling pH
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A(n) ________ cross yields a genotypic ratio of 121 and a phenotypic ratio of 31.
A) allelic B) monohybrid C) test D) dihybrid
The term radappertization is used to describe food preservation by ________.
A. gamma irradiation B. heat C. chemicals D. UV irradiation
Depending on the disease, individuals can be contagious during the incubation and prodromal periods as well as the periods of illness, decline, and convalescence.
a. true b. false
Motor neurons
A) carry impulses to the brain. B) send signals to effector organs. C) transmit impulses toward the spinal cord. D) receive stimuli from inside or outside the body. E) integrate information from many sources.