Which of the following statements concerning the structure of spinal nerves is true?
A. The ventral root has a prominent root ganglion.
B. Each spinal nerve is formed by the union of a cranial nerve and a spinal nerve.
C. The ventral root contains motor or efferent fibers.
D. Spinal nerves do not have specific cutaneous distributions.
E. Rootlets from the surface of the spinal cord form the dorsal and ventral rami.
Answer: C
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Answer the following statements true (T) or false (F)
1. The yellowish area near the center of the retina is called the fovea centralis. 2. The greatest concentration of rods is found in the macula lutea. 3. Looking directly at an object in bright light would give us greater visual acuity because the light would be focused on the fovea centralis. 4. One of the functions of the fluids in the eye is to focus light. 5. Aqueous humor is the watery fluid in the posterior chamber of the eye.
Which of these is (are) found in the medulla oblongata?
A) cardioregulatory center B) swallowing reflex center C) reflex centers for sneezing and coughing D) reflex center for vomiting E) all of these
Phagocytosis differs from endocytosis in that during phagocytosis ________.
A. the plasma membrane extends outwards with pseudopods to surround the substance B. specific membrane receptors bind to the molecules to be brought into the cell C. the plasma membrane invaginates to produce a furrow that pinches off inside the cell D. None of the choices are correct.
Occlusion of which of the following would primarily damage the posterior wall of the heart?
A. circumflex artery B. pulmonary artery C. right marginal artery D. coronary sinus artery E. right coronary artery