Erythrocytes ________
A) possess lobed nuclei and cytoplasmic granules
B) lack a nucleus and most organelles
C) are the least common of all formed elements
D) travel by diapedesis through the walls of vessels
E) clot blood
B
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Maintenance of appropriate ion concentrations (especially after nerve impulses that involved ion diffusion) is primarily the job of
A. sodium-potassium pumps. B. mechanically gated channels. C. voltage-gated channels. D. chemically gated channels.
The strength of a stimulus is communicated through
A. changes in the magnitude of the action potential. B. the frequency of the action potentials. C. the length of time action potentials are produced. D. both the frequency and the length of time action potentials are produced.
The pelvic girdle is comprised of three bones, ___________________, _________________, and ___________________. ________________________________________
Fill in the blank(s) with the appropriate word(s).
Using Figure 17.4, match the following:
1) Tricuspid valve.
2) Mitral valve.
3) Right atrium.
4) Left ventricle.
5) Pulmonary veins.