Neurotransmitters that are modified amino acids are
A) aspartic acid, glutamic acid, glycine, and GABA.
B) dopamine, serotonin, epinephrine, and norepinephrine.
C) enkephalins, endorphins, and substance P.
D) potassium, sodium, and calcium ions
B
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Plasma makes up about ________ percent of a centrifuged sample of whole blood.
A. 55 B. 45 C. 25 D. 75 E. 35
With advancing age, ________ become less elastic as the cross-links that hold collagen molecules together break down.
Fill in the blank(s) with the appropriate word(s).
Identify the phase of cell division in which the nuclear envelope disappears and the chromatids become attached to the spindle fibers.
A) anaphase B) prophase C) interphase D) telophase E) metaphase
Which is not part of the conducting portion of the respiratory system?
A. Bronchi B. Larynx C. Trachea D. Alveoli E. Nasal cavity