The presence of which of the following reduces the risk for myocardial infarctions?
A. Arterial anastomoses in the coronary circulation
B. Desmosomes of the intercalated discs
C. Double circulation
D. Gap junctions in the myocardium
E. Circumflex arteries
A. Arterial anastomoses in the coronary circulation
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Which of the following formed elements in blood are removed by fixed macrophages in the spleen and liver after only 5 to 9 days in the circulation?
a) erythrocytes b) thrombocytes c) monocytes d) basophils e) eosinophils
Permissiveness of hormones refers to the fact that
a. hormones permit cellular processes to occur b. hormones permit their target organs to function at the optimal rate c. in some instances an adequate amount of one hormone must be present for the full exertion of another hormone's effect, even though the first hormone itself does not directly elicit the response d. the nervous system through numerous neuroendocrine relationships permits the endocrine system to function e. the tropic hormones permit other endocrine glands to secrete their hormones
Which of the following does NOT directly affect the alveolar partial pressure of oxygen?
A. PaCO2 B. atmospheric pressure C. tidal volume D. inspired oxygen fraction E. oxygen consumption and carbon dioxide production (R)
Which of the following is least related to glycolysis?
a. NADH b. ATP c. pyruvate d. CO2 e. glucose