If one nerve stimulus arrives at a muscle fiber so soon that the fiber has only partially relaxed from the previous twitch, the most likely result will be ________.
A. flaccid paralysis
B. complete tetanus
C. fatigue
D. incomplete tetanus
E. spasm
Answer: D
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Which of the following descriptions of glial cells is mismatched?
A. Astrocytes - blood-brain barrier B. Microglia - provide support for the neuron cell body C. Ependymal cells - produce cerebrospinal fluid D. Oligodendrocytes - form myelin sheaths E. Ependymal cells - choroid plexus
The true ribs ________.
A. are not attached to the sternum B. are attached by cartilages to the costal cartilages of the ribs superior to them C. are attached directly to the sternum by the costal cartilages D. are attached directly to the sternum by dense regular connective tissue
____________________ along axons reduces resistance and, hence, increases impulse velocity
Fill in the blank(s) with correct word
What is the term used when any other part of the conduction system other than the SA node is setting the pace of the heart?
A. Arrhythmia B. Ectopic focus C. Vagal tone D. Nodal rhythm