The function of helper T-lymphocytes is to
A. initiate and oversee the immune response.
B. trigger cell death by disrupting metabolic activities.
C. secrete toxins to kill or disable pathogens.
D. turn off the immune response once it has been activated.
E. All of the choices are correct.
Answer: A
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Answer the following statement true (T) or false (F)
Which of the following are composed of actin?
A) thick filaments B) thin filaments C) all myofilaments D) None of the listed responses is correct.
The secretion of parathyroid hormone is controlled by ________.
A. a change of blood calcium level B. action potentials for the sympathetic part of the autonomic division C. action potentials for the parasympathetic part of the autonomic division D. a releasing hormone from the pituitary gland
When voltage-gated sodium channels are open, sodium flows ______ the neuron making the inside of the cell more _____.
Fill in the blank(s) with the appropriate word(s).