What does the umbilical vein carry?
A) metabolic wastes and carbon dioxide from the fetus to the placenta
B) metabolic wastes and carbon dioxide from the placenta to the fetus
C) oxygen and nutrients from the fetus to the placenta
D) oxygen and nutrients from the placenta to the fetus
E) blood from the navel into the inferior vena cava
D
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Red blood cells (RBCs) have been placed in three different solutions: hypotonic, hypertonic, isotonic. What is solution "A" relative to the RBC?
A. Isotonic solution B. Hypertonic solution C. Hypotonic solution
The action potentials are slowed at the AV node to allow the
A. pacemaker to reset for the next beat. B. atria to complete their contraction. C. ventricles to repolarize. D. atria to begin their contraction. E. ventricles to completely empty of blood.
Another name for a base is alkali.?
Indicate whether the statement is true or false
From the time it is formed until it reproduces, the cell undergoes growth and carries out its functions in the body. What is the name for this portion of the cell's life cycle?
A) interphase B) functional phase C) life phase D) growth and development