Which of the following is a characteristic of a covalent bond?
A. Electrons are shared.
B. Electrons are donated.
C. The molecule is always polar.
D. Protons are involved in the bond.
Answer: A
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What is the function of thromboplastin in hemostasis?
A) It dissolves the clot after the tissue has healed. B) It initiates the intrinsic pathway of coagulation. C) It acts as a potent vasoconstrictor to reduce blood loss. D) It initiates the extrinsic pathway of coagulation. E) It converts prothrombin into thrombin.
Which of the following does not occur when smooth muscle contracts?
a. Walls of blood vessels help maintain blood pressure. b. Food moves through the digestive tract. c. Bones of the skeletal system move. d. All of the above occur when smooth muscle contracts.
The micturition center is located in the __________________ of the brainstem.
Fill in the blank(s) with the appropriate word(s).
A ________ is a substance that dissolves when added to a solvent
A) molecule B) buffer C) solute D) compound