In October 2001 at the site of the World Trade Center in New York City, fires were still burning from the terrorist attacks that had brought down the buildings. The greatest danger to the respiratory system was
A. very large particles of debris.
B. very small particles of debris.
C. the odor.
D. falling material from damaged buildings.
Answer: B
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Receptor molecules
A. are nonspecific. B. are always lipids. C. attach to the synaptic cleft. D. determine whether a neurotransmitter will be excitatory or inhibitory. E. are not attached to ligand-gated channels.
Which is not correct regarding growth hormone (GH)?
A. GH affects most body cells. B. GH stimulates the kidney to secrete somatomedin. C. GH is a tropic hormone. D. GH is also known as somatotropin. E. GH stimulates cell growth and mitosis.
Besides controlling metabolic rate, thyroid hormone has many functions. These include ________
A) stimulating production of sex cells (egg an sperm) and secondary sex characteristics B) regulation of growth and development, and maturation of the nervous system C) regulation of blood calcium, and release of calcium from bones D) enabling the body to resist both short-term and long-term stressors
Atrial contraction occurs shortly ______.
A. before P wave B. after P wave C. before T wave D. after T wave