Which of the following statements accurately describes electrons?
A. They are found inside the nucleus and have a negative charge.
B. They are found inside the nucleus and have a positive charge.
C. They are in orbitals outside the nucleus and have a positive charge.
D. They are in orbitals outside the nucleus and have a negative charge.
Answer: D
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The pharynx
A. is a passageway for air going to the trachea. B. is a passageway for food and liquid going to the esophagus. C. ends at the inferior cricoid. D. bifurcates into the trachea and esophagus. E. All of the above
Describe the location of the two major ventral body cavities
What will be an ideal response?
The cardiac electrical impulse normally begins spontaneously in the SA node because
A. of the superior location of the SA node in the right atrium. B. of action potentials from the cardioregulatory center. C. the SA node is the only area of the heart capable of spontaneous depolarization. D. of the rich sympathetic innervation of the SA node. E. this area produces action potentials more rapidly than any other portion of the conduction system.
Cone cells belong to what category of sensory receptors?
A. Chemoreceptors B. Proprioceptors C. Mechanoreceptors D. Nociceptors E. Photoreceptors