When a jogger starts to run, the rate at which his muscles produce CO2 rises sharply. The CO2 in his blood rises only slightly before he starts to breathe faster and his heart starts beating stronger. Soon his increased rate of CO2 production is balanced by an increased rate of CO2 removal. This would be an example of __________ feedback because the jogger's circulatory and respiratory systems are __________.
a. negative; restoring the CO2 concentration to a set point
b. positive; improving the operating conditions in the jogger's body
c. positive; decreasing the CO2 concentration
d. positive; restoring the CO2 concentration to a set point
e. negative; acting in opposition to one another
Answer: a. negative; restoring the CO2 concentration to a set point
You might also like to view...
In aquatic ecosystems, CO2 reacts with water to form ____
a. HCO b. HNO3 c. CaCO3 d. CO e. H2CO3
T. H. Morgan and his colleagues found that among the offspring of genetic crosses, parental phenotypic classes were the most frequent, while recombinant classes occurred less frequently. This observation led Morgan to conclude that
A) all genes are linked. B) alleles of linked genes assort independently. C) alleles of some genes assort together. D) genes on different chromosomes assort independently. E) genes on different chromosomes do not assort independently.
The pollen tube grows from the ________ to the ________, where it eventually fertilizes the egg
A) anther; style B) sepal; filament C) stigma; ovule D) petal; ovary
Sexually transmitted chlamydia is similar to infection with Yersinia pestis in that they both can produce
A. urethritis. B. pelvic inflammatory disease in females. C. conjunctivitis. D. buboes. E. pneumonia.