Cold sterilization may be used for surgical instruments
Indicate whether the statement is true or false
F
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Which of the following statements about the refractory period of a membrane is TRUE?
A. The refractory period places an upper limit on the frequency with which a nerve cell can conduct action potentials. B. The refractory period prevents the action potential from spreading back over the part of the membrane that just underwent an action potential. C. The absolute refractory period refers to the period of time during which another action potential cannot be initiated in that part of the membrane that is undergoing an action potential, no matter how great the strength of the stimulus. D. The relative refractory period refers to the period of time during which another action potential can be initiated in that part of the membrane that has just undergone an action potential if a stronger than normal stimulus is applied. E. All of the answer choices are correct.
Motor neurons of the autonomic nervous system
A. always excite effector organs. B. always inhibit effector organs. C. can either excite or inhibit effector organs. D. do not excite effector organs but monitor their status of activity.
The fluid carried throughout the lymphatic system is called ________________________________________
Fill in the blank(s) with correct word
Which of the following most accurately describes how foreign substances can activate complement?
A. Antibodies can bind to foreign antigens and activate complement through the classical pathway. B. Foreign substances can bind to spontaneously activated C3 and stabilize it. C. Foreign proteins bind to C1 and activate it. D. Foreign proteins are phagocytized by macrophages and directly activate complement. E. Antibodies can bind to foreign antigens and activate complement through the classical pathway and foreign substances can bind to spontaneously activated C3 and stabilize it.