Four-year-old Sammy is having a temper-tantrum. In a final attempt to get his way, he yells to his mom, "I'm gonna hold my breath 'til I die!" What is the primary reason that Sammy's mom is unconcerned by this statement?
A. It is impossible for Sammy to control the contraction of his diaphragm and intercostal muscles since they are made up of smooth muscle.
B. Sammy is too young to hold his breath for more than 30 seconds.
C. As Sammy holds his breath, the increasing levels of carbon dioxide in his blood will lead to stimulation of the respiratory control center in his brain.
D. As Sammy holds his breath, the decreasing levels of oxygen in his blood will lead to stimulation of the respiratory control center in his brain.
Answer: C
You might also like to view...
The founder effect is an important component of ____
a. natural selection b. genetic drift c. gene flow d. inheritance e. mutations
Habitat corridors allow animals to move from one habitat fragment to another. Indicate whether the statement is true or false
Since chemoreceptors are found in arthropods, crustaceans, vertebrates and all other animals it is believed that chemoreception is the most primitive sense.
Answer the following statement true (T) or false (F)
Which substance is released by motor neurons to stimulate a contraction?
A) calcium B) acetylcholine C) dopamine D) myosin