Select the term that completes this sentence correctly: "Because our body uses bicarbonate to buffer metabolic acids, we can rid our body of excess acid by exhaling _______."
A. carbon dioxide
B. heat
C. oxygen
D. nitrogen
E. water vapor
Answer: A. carbon dioxide
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Which describes a covalent bond?
A. A bond between two free radicals B. The positive side of one molecule is attracted to the negative side of another C. A bond between water molecules D. Two atoms share electrons with each other from their outermost shell E. A bond between two oppositely charged ions
It is because of adaptive ________ that people normally get chickenpox only once.
A. immunity B. WBCs C. antibodies D. antigens
Synovial fluid is classified as interstitial fluid and is located inside certain joints where it serves as a shock absorber
Indicate whether the statement is true or false
What are osteoclasts?
A. Cells that break down bone B. Cells that build bone C. Cells that break down cartilage D. Cells that build cartilage