Complex sympathetic and parasympathetic reflexes are coordinated by specific processing centers in the medulla, which include
A) vasomotorcenter.
B) vomiting and coughing centers.
C) swallowing center.
D) cardiac center.
E) All of the answers are correct.
E) All of the answers are correct.
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Which statement about hemoglobin is true?
A. Each globin chain on a hemoglobin molecule contains a heme group. B. Hemoglobin is a complex protein made of 5 chains of amino acids called globins. C. Each hemoglobin molecule can carry five oxygen molecules. D. The cytoplasm of white blood cells contains hemoglobin.
Blood from the descending colon and rectum is carried to the hepatic portal vein by the
A. superior mesenteric vein. B. inferior mesenteric vein. C. splenic vein. D. gastric vein. E. cystic vein.
"Complement" refers to a group of
A. white blood cells. B. plasma proteins. C. antibodies. D. molecules on the surface of pathogenic microbes.
During which phase of meiosis do synapsis and crossing over occur?
A. Anaphase I B. Prophase I C. Telophase II D. Prophase II E. Metaphase I