A primary active transport process is one in which __________.
A)molecules pass directly through the phospholipid bilayer of the plasma membrane
B)the plasma membrane folds inward to form a vesicle containing extracellular material
C)an intracellular vesicle fuses with the plasma membrane and releases its contents to the extracellular fluid
D)molecules move across the plasma membrane without an input of energy
E)molecules move through transport proteins that have been activated by ATP
E)molecules move through transport proteins that have been activated by ATP
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The part of a tooth that contains blood vessels and nerves is the
A) enamel. B) cement. C) dentin. D) pulp cavity. E) periodontium.
Movement of a body part toward the main axis of the body is called
A. abduction. B. flexion. C. inversion. D. retraction. E. adduction.
Select the correct statement about the uterine cycle.
A) The menstrual phase of the cycle is from day 1 to day 8. B) During the secretory phase, estrogen levels are at their highest. C) During the proliferative phase, levels of progesterone rise as the follicle begins to produce more hormone. D) If fertilization occurs, the corpus luteum is maintained by a hormone secreted by the developing embryo.
Cardiac contraction induces blood flow in the arterial system, but it has no influence on blood flow in the veins
Indicate whether the statement is true or false