The P wave on an electrocardiogram (ECG) represents the depolarization of cells in the:
A) sinoatrial (SA) node. B) atrioventricular (AV) node.
C) ventricles. D) atria.
Answer: D
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The rate of gastric emptying is influenced by factors both in the stomach and in the duodenum
Indicate whether the statement is true or false
Estrogen levels cause both increased and decreased hormone secretions from the anterior pituitary and hypothalamus at various points in the menstrual cycle. This indicates that ________.
A. estrogen is involved in both positive and negative feedback with the anterior pituitary and hypothalamus B. estrogen is secreted in consistent amounts from the ovaries throughout the menstrual cycle C. estrogen is not involved in any feedback loops D. the ovaries serve as the integrating center in a feedback loop with the anterior pituitary and hypothalamus
An increase in blood Ca2+ concentration stimulates the thyroid gland to secrete ________.
A. calcitonin B. thyroxine C. T4 D. T3
Which type of lung cancer originates in the bronchial epithelium?
A. Adenocarcinoma B. Oat cell carcinoma C. Squamous cell carcinoma D. None of these are correct.