A skeletal muscle cell contains hundreds to thousands of ________, which are complex organelles; they are cylindrical in shape-about 2 micrometers in diameter and as long as the cell.
A. microfilaments
B. T-tubules
C. sarcolemma
D. myofibrils
E. sarcomeres
Answer: D
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The lumbar region of the back is the __________
Fill in the blank(s) with correct word
The most profound changes in thoracic volume can be accomplished by contraction of the ____________________
Fill in the blank(s) with correct word
Breastfeeding is an excellent contraceptive for women in developed countries.
Answer the following statement true (T) or false (F)
This figure shows an example of regulation of hormone secretion by a negative feedback loop. The large box labeled 1 represents the initial stimulus. Which could be the initial stimulus for this pattern of regulation?
A. Low blood sugar level B. High WBC (white blood cell) count C. High blood calcium level D. Low body temperature E. Low RBC (red blood cell) count