Oxygen moves from alveoli to the bloodstream
a. because the concentration of oxygen is
greater in alveoli than in the blood.
b. mainly due to the activity of carbonic
anhydrase in the red blood cells.
c. because of its attraction to hemoglobin.
d. to counter the high concentration of CO2 in
the blood.
e. because of all of these
A
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Which of these time intervals, based on plant fossils, came last (most recently)?
A) extensive growth of gymnosperm forests B) Silurian-Devonian explosion with fossils of plant lineages that contain most of the major morphological innovations C) colonization of land by early liverworts and mosses D) rise and diversification of angiosperms E) carboniferous swamps with giant horsetails and lycophytes
Speciation caused by a change in the course of a river is an example of ____ speciation
a. divergent b. parapatric c. allopatric d. convergent e. sympatric
The neuron that secretes neurotransmitters into the synapse is called the _________, and the neuron that receives the signal is called the ________.
A. presynaptic neuron; postsynaptic neuron B. preneurotransmitter; postneurotransmitter C. postneurotransmitter; preneurotransmitter D. postsynaptic neuron; presynaptic neuron
Which of the following statements is false?
a. It is assumed that lower animals are incapable of perception. b. Humans, as the most complex organisms, have all of the sensory organs found in lower forms. c. Mechanoreceptors are responsible for the senses of equilibrium and hearing. d. Nociceptors detect damage to tissues. e. A lobster reacts to the boiling water in which it is placed to cook.