The active sites to which cross-bridges attach are found on the
A. sarcoplasmic reticulum.
B. actin myofilaments.
C. Z disks.
D. T tubules.
E. myosin myofilaments.
B
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Areas of the nervous system that are dense in myelinated axons are referred to as
A) arachnoid mater. B) white matter. C) pia matter. D) dura mater. E) gray matter.
The iris consists of layers of ____________________ and ____________________ smooth muscle fibers
Fill in the blank(s) with correct word
The internal nose connects with the pharynx via two openings called the internal ____
a. vestibules b. nares c. cavities d. septa
Answer the following questions true (T) or false (F)
1. Corticotropin-releasing hormone (CRH), released by the placenta, increases the production of cortisol from the adrenal cortex, which is needed for the maturation of the fetal lungs and the production of surfactant. 2. A pregnant woman typically needs about 300 extra calories each day to support both herself and the fetus. 3. Dilation is the longest of the three stages of labor.