Which of the following ECG waves represents ventricular repolarization?
a. P wave.
b. QRS complex.
c. T wave.
d. PR segment.
e. ventricular repolarization occurs simultaneously with atrial depolarization and consequently cannot be recorded.
C
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The uptake of cholesterol into cells is an example of
A. phagocytosis. B. pinocytosis. C. receptor-mediated endocytosis. D. receptor-mediated exocytosis. E. simple diffusion.
Which choice best distinguishes between mitosis and meiosis?
A. Mitosis produces sex cells that are genetically identical to the parent cell, whereas meiosis produces somatic cells that are genetically different from the parent cell. B. Mitosis produces sex cells that are genetically different from the parent cell, whereas meiosis produces somatic cells that are genetically identical to the parent cell. C. Mitosis produces somatic cells that are genetically identical to the parent cell, whereas meiosis produces sex cells that are genetically different from the parent cell. D. Mitosis produces somatic cells that are genetically different from the parent cell, whereas meiosis produces sex cells that are genetically identical to the parent cell.
Indicate which is the proper sequence of blood flow through the circulatory system
1 . right atrium 2 . left atrium 3 . right ventricle 4 . left ventricle 5 . pulmonary artery 6 . pulmonary vein 7 . lungs 8 . systemic tissues 9 . aorta 10 . vena cava a. 1-2-3-4-5-6-7-8-9-10 b. 10-2-4-5-7-6-1-3-9-8 c. 10-1-3-5-7-6-2-4-9-8 d. 10-1-2-3-4-5-7-6-9-8 e. none of these answers.
Which of the following structures is most like the receptor of a homeostatic control mechanism?
A. The mechanism that opens the automatic door at the local grocery store B. The mechanism that detects a decrease in tire pressure on an automobile C. The heating element of a hot water heater D. All of the choices are correct.