During ventricular ejection,
A) the semilunar valves are closed.
B) the QRS complex is just starting.
C) blood is forced into veins.
D) the AV valves are open.
E) the ventricles are in systole.
E) the ventricles are in systole.
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Signaling molecules are divided into categories based upon their chemical structure. Which of the following is NOT a chemical structure category for signaling molecules?
a. retinoids b. gases c. pyrimidines d. amines e. peptides
Which structure marks the end of the left ventricle and the entrance to the aorta?
A. Foramen ovale B. Right atrioventricular valve C. Aortic semilunar valve D. Pulmonary semilunar valve E. Left atrioventricular valve
Decreased collagen and relatively more matrix is associated with ______ bone.
A. fetal B. aging C. post-pubescent
Cells that lack ribosomes cannot
A. eliminate wastes. B. produce energy. C. package cellular products. D. engage in protein synthesis. E. ingest and phagocytize bacteria.