The large number of alveoli in lungs improve gas exchange by _____.
A. increasing the concentration difference
B. changing the diffusion constant
C. decreasing the distance for diffusion
D. increasing the surface area for diffusion
D. increasing the surface area for diffusion
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Neuropeptide neurotransmitters
a. can act as a direct neurotransmitter between neurons and muscle cells. b. can act as a postsynaptic membrane inhibitors. c. directly open K+ channels to inhibit neurons. d. can act as pain reducers and initiate euphoria. e. directly inhibit euphoria.
All of the genes located on a given chromosome
constitute a. a karyotype. b. a bridging cross. c. a wild-type allele. d. a linkage group. e. none of these.
What are the three general types of amino acids?
A) ? helices, ? sheets, and looped segments B) covalent, noncovalent, and van der Waals forces C) positive, negative, and noncharged D) hydrophobic, polar (noncharged), polar (charged) E) acidic, basic, and neutral
What two organs are considered to be part of the lymphatic system?
A) Pancreas and liver B) Heart and lungs C) Thalamus and hypothalamus D) Gall bladder and kidneys E) Spleen and thymus