The placenta is detached from the uterus during which one of the following stages of labor?
A) placental
B) dilation
C) secretory
D) expulsion
E) afterbirth
E
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Briefly describe the function of a portal vein system (for example, the hepatic portal vein).
What will be an ideal response?
Impulses conducted along the transverse tubules of the muscle fiber stimulate
A. the release of ATP. B. the binding of actin to the Z lines. C. tropomyosin and troponin binding. D. the release of calcium ions. E. the release of acetylcholine.
Members of this Lophotrochozoan phylum have highly segmented bodies, with many repeating units
that are usually separated by transverse partitions called septa.
a. Rotifera b. Mollusca c. Platyhelminthes d. Annelida e. Nemertea
In the amniote egg diagram shown, the item labeled "5" is the
a. yolk sac. b. chorion. c. allantois. d. amnion. e. albumin.