Norepinephrine and epinephrine open ________ channels inducing a faster diastolic depolarization.
A. HCN
B. fast Ca2+
C. voltage-gated Ca2+
D. fast Na+
Answer: A
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How is autocrine regulation best described?
A. Chemical regulators released by cells affect the functional status of different kinds of cells in the vicinity of the secretory cell. B. Chemical regulators are continuously released in constant amounts by the cell. C. Chemical regulators affect the same cells that produce them. D. Chemical regulators reach their site of action through a duct. E. Chemical regulators are released directly into blood vessels.
The mediastinum is part of the:
a. dorsal cavity b. ventral cavity c. abdominal cavity d. both B and C above
Henry has a thrombus just beyond where the vertebral arteries join on the base of the pons. Which vessel is affected?
A. dural sinuses B. basilar artery C. cranial artery D. None of the choices are correct.
Which of the cartilage types below is matched correctly to it body location?
A) elastic; at the ends of the bones where they form joints B) fibrocartilage; meniscus of the knee C) hyaline; between bodies of vertebrae