During exercise, the initial rapid increase in breathing rate appears to be primarily because of
A. increased blood carbon dioxide levels.
B. decreased blood oxygen levels.
C. decreased blood pH levels.
D. collateral sensory input from the skeletal muscles and joints during limb movements.
Ans: D. collateral sensory input from the skeletal muscles and joints during limb movements.
You might also like to view...
Explain why the prefix homeo- is used in the term homeostasis. Why do some physiologists prefer the term homeodynamics over homeostasis?
What will be an ideal response?
Which of the following statements is NOT true?
a. Cnidarians circulate fluid in the coelenteron. b. The differences between an open and a closed circulatory system are clear-cut. c. Many animals have an internal extracellular fluid that is separate from the environment. d. The fluid leaving the capillary bed of closed circulatory systems is similar to the hemolymph of open systems. e. Closed circulatory systems are made necessary by the large size of organisms that have them and the large distances between nutrient sources and cells.
Sensible perspiration
A. is water lost through simple evaporation. B. is secreted by the sweat glands. C. is secreted by salivary glands. D. contains only water. E. is invisible on the skin.
An elderly person becomes confused, and takes an overdose of a medication designed to block both cholesterol uptake from the GI tract and cholesterol synthesis by all cells
After 24 hr, the individual is severely hypocholesterolemic (i.e., has very low levels of circulating cholesterol). This individual would experience a transient lower level of which type of hormone? A. catecholamines B. protein hormones C. steroid hormones D. iodothyronines E. peptide hormones