The pulmonary arteries have ________ elastic tissue and ________ lumens than systemic arteries.
A. less; narrower
B. more; wider
C. more; narrower
D. less; wider
Answer: D
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Where do the special senses originate?
A) Special senses originate at the axon of the sensory neuron. B) Special senses originate at the interneurons of the brain. C) Special senses originate at the sensory receptor. D) Special senses originate in the thalamus where sensations are relayed. E) Special senses originate in the association areas of the cerebral cortex.
Parathyroid hormone stimulates calcitriol synthesis in the kidney and is therefore a tropic hormone.
Answer the following statement true (T) or false (F)
Internal work includes
a. all of the energy-expending activities that must go on all of the time to sustain life b. all energy expenditure by tissues other than skeletal muscles c. the energy expenditure required to move external objects d. both a and b e. all of the above
What is a major function of potassium ions in the body?
A) activating enzymes B) repolarization of neurons and muscle cells after action potential C) forming hydroxyapatite salts in osseous tissue D) maintaining osmotic pressure in the extracellular fluid (ECF)