The opening of more and more Na+ ion channels during depolarization
A. is the result of the sodium-potassium exchange pump.
B. is an example of a positive feedback cycle.
C. is possible only if K+ channels remain closed.
D. is the cause of the afterpotential.
E. is an example of a negative feedback cycle.
B
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During surgery, general anesthesia inhibits the ________, causing unconsciousness in the patient.
A. reticular system B. basal nuclei C. limbic system D. hypothalamus
If someone had a cut in their skin through which a bacterium entered, but that bacterium was then destroyed by a neutrophil, this would be an example of
A. failed external adaptive immunity, but successful innate immunity. B. failed innate immunity, but successful adaptive immunity. C. failed external innate immunity, but successful internal innate immunity. D. failed external immunity, but successful internal acquired immunity.
Deep inward extensions of the sarcolemma form a tunnel-like network inside the muscle cell known as:
A) myofibrils. B) transverse tubules (T-tubules). C) myofilaments. D) the sarcoplasmic reticulum.
In addition to the supporting muscles and ligaments found in the vertebral column, the thoracic spine is further stabilized by the:
A) diaphragm. B) upper sternum. C) rib attachments. D) large spinous processes.