Jim adds an acid to a solution, but finds the pH has not changed afterward. This suggests the solution contains a(n) (anion/buffer/salt).
Fill in the blank(s) with the appropriate word(s).
buffer
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What is the process by which cells of a malignant tumor can break away and start new cancers at distant locations?
What will be an ideal response?
Which statement is false concerning movement of molecules across the cell membrane?
A) Water and gas molecules have no difficulty. B) Small uncharged molecules pass through easily. C) Large molecules do not pass through easily. D) Charged molecules do not pass through easily. E) Lipid molecules do not pass through easily.
Adult giraffes can be up to 20 ft. tall, and thus require special adaptations to maintain appropriate blood pressure. One adaptation is the rete mirabile, a group of blood vessels that form a web or net-like structure to slow blood flow.The giraffe, as the tallest living land animal, has several adaptations for its height. To prevent blood from pooling in the head when it bends down to drink, the jugular veins of a giraffe have multiple one-way valves. Furthermore, a web of arteries and veins in the neck called the rete mirabile ("wonderful net") slows the flow of blood into the brain. These specializations of the ________ act as mechanisms to maintain ________.
A. circulatory system; blood pressure homeostasis B. nervous system; temperature homeostasis C. circulatory system; pH homeostasis D. nervous system; homeothermy