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

Anatomy & Physiology

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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.

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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?

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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.

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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.

Anatomy & Physiology