In the heart of cartilaginous fishes, blood enters the _____ and is returned to the systemic circulation by the _____
a. right atrium; left ventricle
b. sinus venosus; conus arteriosus
c. sinus arteriosus; conus venosus
d. sinus venosus; bulbus arteriosus
e. sinus arteriosus; bulbus venosus
B
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Which is NOT true about cofactors involved in enzymatic reactions?
A. They may alter the conformation of the enzyme. B. Only a small number of cofactor molecules may be needed to maintain enzyme activity. C. They may be a metal such as iron. D. There must be equal quantities of enzyme and cofactor molecules for a reaction to proceed. E. They may be a substrate in a catalyzed reaction.
The neural change responsible for retention or storage of knowledge is known as the ____________________
Fill in the blank(s) with correct word
Which of the following would disqualify a chemical messenger from being considered a paracrine signal?
a. It is an organic molecule. b. It is not transported in the blood. c. It affects the cell that released it. d. Once released, it is distributed to its target(s) by simple diffusion. e. It is released as a specific response to a signal.
The patient was in a coma and you forgot to turn them often enough so they developed bedsores.
A) Anemic hypoxia B) Ischemic (stagnant) hypoxia C) Hypoxemic hypoxia D) Histotoxic hypoxia