Carbon dioxide levels in the blood and cerebrospinal fluid affect blood pH. This enables the organism to sense a disturbance in
gas levels as ________. A. the brain directly measures and monitors oxygen levels and causes breathing changes accordingly. B. the brain alters the pH of the cerebrospinal fluid to force the animal to retain more or less carbon dioxide. C. the medulla oblongata, which is in contact with cerebrospinal fluid, monitors pH and uses this measure to control breathing. D. stretch receptors in the lungs cause the medulla oblongata to speed up or slow breathing.
C. the medulla oblongata, which is in contact with cerebrospinal fluid, monitors pH and uses this measure to control breathing.
Explanation:
The central chemoreceptors are located near the medulla inside the blood-brain barrier. When CO2 in cerebrospinal fluid increases, pH of the fluid lower (because CO2 becomes hydrated to carbonic acid). Change in pH stimulates the central chemoreceptors to activate respiratory centers which will increase the respiratory rate and depth of breathing.
Answer: These changes can be caused by environmental factors such as ultraviolet radiation from the sun, or can occur if an error is made as DNA copies itself during cell division. Acquired mutations in somatic cells (cells other than sperm and egg cells) cannot be passed to the next generation.
The answer is people, as this is one of the sculptural
replicas that have been made by Edward Kienholz’s in the beanery. He was able
to make beautiful sculptures and replicas that could also depict aspects in the
life of the modern world.
