Severe combined immune deficiency (SCID) describes a condition in which neither nor are functional. Question 1 options: innate; acquired immune responses MHC class I; MHC class II molecules T-cell-dependent antibody responses; cell-mediated immune responses classical; alternative pathways of complement
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Ответ:
Cell dependent antibody responses; cell-mediated immune responses
Explanation: We know that this is an immune deficiency, so it has to do with something in the immune system and its immune cells. The cells of the immune system help to make sure things travel safely as well as the antibodies they produce.
Ответ:
An action potential is caused by either threshold or suprathreshold stimuli upon a neuron. It consists of four phases; hypopolarization, depolarization, overshoot, and repolarization.
*Part 2 of the question*
An action potential occurs when a neuron sends information down an axon, away from the cell body. ... Therefore, the neuron either does not reach the threshold or a full action potential is fired - this is the "ALL OR NONE" principle.
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