Asian pearl divers hyperventilate in order to reduce the __________ concentration in the blood
a. oxygen
b. hydrogen ion
c. carbon dioxide
d. chloride ion
e. hemoglobin
C
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Root activities are all passive, requiring no additional energy
A. true B. false
At the doctor's office, you may have noticed that when you are asked to "breathe deeply," your chest rises and falls more dramatically than when you are breathing normally. Why?
A. Your intercostal muscles are being used to expand your chest cavity. B. Your spiracles are being used to expand your chest cavity. C. Your air sacs are being used to expand your chest cavity. D. Your bronchioles are being used to expand your chest cavity.
The formation of carbonic acid in the oceans directly results in
A) increased sea surface temperatures. B) inhibition of shell growth in marine animals. C) increased marine biodiversity. D) increased pH.
What is a characteristic of the all-or-none response?
a. If a stimulus is strong enough, all axons in a nerve bundle will fire simultaneously. b. A neuron will only produce an action potential if it has been depolarized to its threshold level. c. All neurons of a nerve bundle discharge impulses at the same frequency. d. A neuron can create an action potential of varying intensities. e. Either all or none of the neurons of a brain region will fire impulses when stimulated.