The exchange of gases between the alveoli and the pulmonary capillaries is called external respiration.
a. true
b. false
Ans: a. true
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Bones are constantly undergoing resorption (breaking bone down) for various reasons. Which of the following cells accomplishes this process?
A) osteoblast B) stem cell C) osteoclast D) osteocyte
The space between the body wall and the GI tract of vertebrates is known as the
A) Gastric vestibule. B) Peritoneal cavity. C) Visceral mass. D) Abdominal lumen.
Autonomic ganglia contain ________
A) the cell bodies of motor neurons B) both somatic afferent and efferent neurons C) synapses between postganglionic fibers and their effectors D) an outer connective tissue capsule around the cell bodies of preganglionic motor neurons
Voltage-gated K+ channels:
a. are closed during the falling phase of the action potential b. are slow to close c. are activated at threshold, but open a short time later d. both b and c e. all of the above