All of the following provide chemoreceptor input to the respiratory centers of the medulla oblongata except the
A) olfactory epithelium.
B) medullary chemoreceptors.
C) aortic body.
D) carotid body.
E) central chemoreceptors.
A
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Sympathetic preganglionic fibers are ________ and have ________ axons
A) short; myelinated B) short; unmyelinated C) long; myelinated D) long; unmyelinated E) intermediate; small
Answer the following statements true (T) or false (F)
1. The peritoneum is the most extensive serous membrane in the body. 2. Peyer's patches are found in the submucosa of the distal end of the small intestine. 3. The myenteric nerve plexus provides the major nerve supply to the GI tract wall and controls GI motility. 4. The first teeth to appear are the deciduous teeth. 5. Dentin anchors the tooth in place.
The cervical region is the ________.
A. neck B. calf C. armpit D. hollow behind the knee E. thigh
A drug that decreased calcium levels in a muscle cell and thereby lowered the number of crossbridges formed during the heart's contractions would be a
A. positive chronotropic agent. B. positive inotropic agent. C. negative inotropic agent. D. negative chronotropic agent.