Describe the functions of water in the body
What are they?
Water is a solvent that allows transportation of solutes. Water acts in hydrolysis reactions to split reactants. Water can transport heat in the body and can be used to release heat from the body as occurs in sweating. Water is used as a lubricant, particularly in serous fluids like those surrounding the lungs and on mucosal membranes like those lining the gastrointestinal tract.
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The action potential is caused by permeability changes in the plasma membrane
Indicate whether the statement is true or false
The esophagus
A) is reinforced by cartilaginous structures. B) is a hollow muscular tube that connects the pharynx to the stomach. C) is under both voluntary and autonomic nervous control. D) always remains open. E) All of the answers are correct.
Which of the following is NOT true of joint movements?
A. In the upper and lower limbs, the origin is typically proximal to the insertion. B. The more moveable end of a skeletal muscle is called its insertion. C. When a skeletal muscle contracts to move a joint, the insertion is pulled toward the origin. D. Most joints are flexed and abducted when the body is in anatomical position. E. All of these are true of joint movements.
When a clot is no longer needed, fibrin is dissolved by ________.
A. plasmin B. thromboplastin C. platelet-derived growth factor D. prothrombin E. kallikrein