________ involves a cascade of reactions leading to the conversion of fibrinogen to fibrin
A) Vascular spasm
B) The platelet phase
C) Retraction
D) Coagulation
E) Fibrinolysis
Answer: D
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At very low concentrations, epinephrine causes an artery to dilate. At higher concentrations epinephrine causes the same artery to constrict. How can these different effects be explained?
A. There are two types of receptors for epinephrine that use the same second-messenger system. B. There are two types of epinephrine receptors with different affinities for epinephrine that use two different second-messenger systems. C. There is one type of epinephrine receptor that uses two second-messenger systems. D. At higher concentrations epinephrine can pass through the plasma membrane and directly stimulate contraction within the cell.
Select the correct statement regarding epithelia.
A) Simple epithelia form impermeable barriers. B) Stratified epithelia are tall, narrow cells. C) Stratified epithelia are present where protection from abrasion is important. D) Pseudostratified epithelia consist of at least two layers of cells stacked on top of one another.
The hydration status of animals is obtained from the _________________________ or elasticity of the skin
Fill in the blank(s) with correct word
Blood clotting is an example of positive feedback since the action of the effector opposes that of the stimulus.
Answer the following statement true (T) or false (F)