The thin strand of pia mater that helps to anchor the spinal cord to the coccyx is the
A. coccygeal tendon.
B. terminus coccyx.
C. conus medullaris.
D. filum terminale.
E. cervical enlargement.
Answer: D
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The factor(s) that determine the duration of a twitch in various types of fibers is the speed of the
A) hydrolysis of ATP only. B) removal of Ca2+ ions from the sarcoplasm only. C) removal of Ca2+ ions from the sarcoplasm and hydrolysis of ATP and movement of Na+ across their membranes. D) movement of Na+ across their membranes only. E) removal of Ca2+ ions from the sarcoplasm and hydrolysis of ATP.
________ nonspecifically cause virus-infected cells to lyse
a. Cytotoxic T-cells b. Natural killer cells c. Lymphocytes d. Macrophages e. Granulocytes
Cardiac muscle cannot undergo tetanus because its absolute refractory period lasts almost as long as the muscle twitch.
Answer the following statement true (T) or false (F)
The primary curves of the vertebral column are also called accommodation curves, while the secondary curves are also called ________ curves.
Fill in the blank(s) with the appropriate word(s).