Electrons whirl around the center of the atom at high speed, forming a(n)
A) spiral.
B) figure 8.
C) cylinder.
D) electron cloud.
E) helix.
D
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Which of these results from hyperventilation? A) Increased alveolar PO2B) An increase in alveolar PCO2C) Decreased alveolar PCO2D) A decrease in alveolar PO2E) The same alveolar PCO2 as under normal conditions
What will be an ideal response?
A general characteristic of connective tissue is that it
A. has no blood supply. B. covers the outside of organs. C. lines organs. D. consists of cells within extracellular material.
After death, rigor mortis lasts until
A) ATP is produced. B) T-tubules recapture calcium ions. C) sodium ions are released by the sarcoplasmic reticulum. D) sarcomeres lengthen. E) myofilaments are broken down.
The one-way propagation of action potentials down an axon is primarily due to
A) sodium ion depletion. B) potassium ion depletion. C) the absolute refractory period. D) ATP loss.