A patient is found to have problems with blood flow to the anterior wall of the left ventricle. Which artery is most likely the cause of this patient's health problem?
A. Left coronary
B. Right coronary
C. Circumflex branch
D. Posterior interventricular
Answer: A
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Lipid-soluble hormones, such as progesterone, exert their effects by forming hormone-receptor complexes that
A. activate a G protein and second-messenger cascade. B. bind to DNA and initiate transcription. C. open ion channels in the cell membrane. D. activate adenylate cyclase.
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 depolarization phase of an action potential is punctuated by the closing of inactivation gates in the voltage gated sodium ion channels. All of the following are consequences of this inactivation except one
Choose the statement below that is not a consequence of the closing of inactivating gates. A) This allows for the efflux (diffusion out) of potassium ions, resulting in the repolarization of the cell. B) This allows for the one way transmission of action potential down the axon. C) This limits the frequency of action potentials down the axon. D) This stops the depolarization of the axon membrane.
The entire process of movement of the sperm and sex gland secretions out of the male reproductive tract is called ____________________; emptying of semen into the urethra is known as ____________________; forceful ejection of sperm from the penis is called ____________________
Fill in the blank(s) with correct word