Which of the following is/are vasoconstrictors?
A) serotonin
B) platelet-activating factor
C) thromboxane A2
D) serotonin and thromboxane A2
E) adenosine diphosphate
D) serotonin and thromboxane A2
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The placental membrane is composed of
A. the embryonic disc. B. the amnion and chorion. C. a single layer of epithelial cells. D. a double layer of epithelial cells.
The most common type of feeding is free choice
Indicate whether the statement is true or false
The striations in striated muscle correspond with actual molecular structures. Which of the following is the I band?
A) a band where only actin myofilaments are found B) a band where only myosin myofilaments are found C) an attachment point for actin myofilaments D) an attachment point for myosin myofilaments
What is systemic arterial oxygen tension (PO2) in a healthy young person breathing room air at sea level?
A. 40 mm Hg B. 46 mm Hg C. 100 mm Hg D. 150 mm Hg E. 760 mm Hg