During an isometric twitch in a skeletal muscle
A. the whole muscle shortens.
B. tension generated by the muscle always exceeds the load on the muscle.
C. H zones shorten.
D. sarcomeres do not significantly shorten.
E. tetanus occurs.
Answer: D
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The esophagus:
A) contains cartilaginous rings. B) enters the superior mediastinum anterior to the trachea. C) in the superior mediastinum is in contact with the thoracic duct on its left. D) inclines to the right as it nears the diaphragm. E) traverses the diaphragm at the T8 level.
Polyarthritis can be treated with ______________ antibiotics
Fill in the blank(s) with correct word
During spermatogenesis, the first meiotic division yields two ____, and the second meiotic division yields four ____
a. primary spermatocytes, secondary spermatocytes b. secondary spermatocytes, spermatids c. spermatids, spermatozoa d. spermatogonia, primary spermatocytes e. none of these answers.
Depolarization of the oocyte plasma membrane occurs when the first sperm attaches to the integrin ?6?1. This is called the
A. slow block to polyspermy. B. acrosomal reaction. C. fast block to polyspermy. D. fertilization. E. spermiogenesis.