Blood levels of hormone are kept within very narrow ranges by _________ mechanisms.
A. humoral
B. neural
C. hormonal
D. negative feedback
Answer: D. negative feedback
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Cytokines are agents that affect neighboring cells without triggering systemic effects
Indicate whether this statement is true or false.
Factor X is related to thrombin in the same way that thrombin is related to
a. prothrombin b. fibrin c. fibrinogen d. plasminogen e. thromboplastin
Which of the following terms refers to a lack of oxygen supply to heart muscle cells?
functional syncytium embolism ischemia infarction
You are viewing a vessel through the microscope and note the presence of valves. In what direction would blood flowing as it moves through this vessel?
A) Toward the heart B) Away from the heart C) Toward the pulmonary capillaries D) Toward the systemic capillaries