If you centrifuge (spin) whole blood, you will find the red blood cells (erythrocytes) at the bottom of the tube and white blood cells atop them. This implies that ________
A) red blood cells are larger than white blood cells
B) white blood cells are fewer in number than red blood cells
C) white blood cells are smaller than red blood cells
D) red blood cells have a greater density than white blood cells
D
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You just ate a huge, delicious breakfast and now are going to head out for your morning run. As you try picking up the pace, you find running to be quite difficult because
A. everywhere in the systemic circuit, blood vessels are constricted. B. stroke volume is decreased. C. your heart rate is too high. D. blood flow to the abdominal organs is dominant. E. your mean arterial pressure is too high.
Using the maintaining of a constant temperature in a building as an example of a feedback loop, the furnace would be an example of a(n):
a. sensor b. control center c. effector d. positive feedback loop
A small family was traveling in its van and had a minor accident. The children in the back seats were wearing lap belts, but still sustained numerous bruises about the abdomen, and had some internal organ injuries. Why is this area more vulnerable to damage than others?
What will be an ideal response?
Adding additional neutrons to an atom would form ________.
A. an ion B. an isotope C. covalent bonds D. ionic bonds