Which of these is not a factor that influences regeneration of PNS axons?
A. Distance of the damaged axon from the brain
B. Secretion of nerve growth factors by neurolemmocytes
C. Distance of the damaged axon from the receptor organ
D. Amount of damage
E. No exceptions; all of these affect regeneration
Answer: A
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You and your lab partner are doing an experiment in physiology lab. Each of you has an isolated muscle cell and you are supposed to stimulate it with an electrode as soon as its absolute refractory period ends. You're watching an electromyograph tracing to know when to use the electrode. Your partner has a cardiac muscle cell and you have a skeletal muscle cell. Which one of you will use your electrode more times in one minute?
A. You both will use the electrode the same number of times. B. Your partner will use the electrode more times in a minute than you will. C. You will use the electrode more times in a minute than your partner will. D. The number of times you will use the electrode in a minute cannot be determined by this information alone.
Riboflavin is carried in the blood combined with the blood protein called ________.
Fill in the blank(s) with the appropriate word(s).
Which structure would NOT be found in the vascular layer?
-iris -ciliary body -cornea -choroid
What are pluripotent stem cells?
A. Cells that are able to develop only into one mature cell type. B. Cells found only in the bone marrow that can differentiate into any kind of blood cell. C. Cells found only in adult tissue that replace cells that have died or become damaged. D. Cells from pre-embryos that can develop into any type of embryonic or adult cell. E. Very strong cells that can assume the function of any cell type in the body.