When the solute concentration outside a red blood cell equals the solute concentration inside the cell, the solution is called ____
a. hypotonic
b. osmotic
c. hypertonic
d. isotonic
d
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Convergence refers to
A. dendrites from the same neuron touching each other. B. dendrites from neurons in different parts of the nervous system contacting the same neuron. C. a neuroglial cell that contacts many neurons. D. axons from neurons in different parts of the nervous system contacting the same neuron.
Each of the receiving chambers of the heart has a wrinkled flaplike extension; the one that is more visible from an anterior view is the
A. interatrial septum. B. interventricular septum. C. left auricle. D. right auricle.
Small veins in the neural tissue of the brain empty directly into the
A) coronary sinuses. B) dural sinuses. C) cerebral arterial circle. D) external jugular vein. E) vertebral veins.
Sunlight, ultraviolet light, and X-rays all darken skin because they increase blood flow to the dermis.
Answer the following statement true (T) or false (F)