Following damage to axons nearby, oligodendrocytes
A. grow their own fibers to occupy the space.
B. secrete growth-inhibitory molecules.
C. do not secrete any chemicals.
D. secrete growth factors.
Answer: B
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At peak levels of muscle exertion, the mitochondria can supply ________ of the energy required by the muscle
A) all B) 80 percent C) more than half D) only about one-third E) only about 10 percent
Which of following properties of the cytoskeleton is false?
A) It supports organelles. B) It controls cell shape. C) It provides cell strength. D) It is made of cytobones. E) It moves organelles.
What is described by the Frank-Starling mechanism of the heart?
A. the relationship between end-diastolic volume and heart rate B. the relationship between end-systolic volume and stroke volume C. the relationship between length and tension in cardiac muscle cells D. the relationship between sympathetic stimulation and stroke volume E. the relationship between arterial blood pressure and stroke volume
The I band is dark and split by a Z line.
Answer the following statement true (T) or false (F)