Which of the following opposes the flow of blood back to the heart?
A) vascular resistance
B) peripheral veins have valves to prevent backflow of blood
C) muscular pumps squeeze veins and move blood toward the heart
D) blood pressure
E) blood pressure gradient from arteries to veins
A
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Which of the following is a vasoconstrictor released by platelets that aids in hemostasis?
A. Serotonin B. Platelet-derived growth factor C. Histamine D. Factor XII E. Plasmin
The cells of the blastocyst that become the embryo proper are the cells of the ________.
Fill in the blank(s) with the appropriate word(s).
Which of the following blood types is incompatible for donation to A+?
A) A? B) O? C) B? D) O+
Hyponatremia is usually a result of hypotonic hydration.
Answer the following statement true (T) or false (F)