The second signal during cytotoxic T-lymphocyte activation involves stimulation of the cell by interleukin 2 released by helper T-lymphocytes
Indicate whether this statement is true or false.
TRUE
You might also like to view...
Drug Y is a drug that is used to increase the force of contraction achieved by heart muscle tissue. In the absence of the drug, epinephrine increases heart contractility through a signaling pathway that involves a receptor and cAMP. Which of the following are plausible mechanisms of action for Y?A) Acting as an agonist on the receptor for epinephrine, a hormone that increases heart contractilityB) Increasing the expression of cAMPC) Inhibiting phosphodiesterase activityD) Increasing the availability of phosphodiesterase moleculesE) Decreasing the activity of cAMP-dependent protein kinase
What will be an ideal response?
A patient with a thicker-than-normal buffy coat may have:
a. an infection b. leukemia c. leukopenia d. both A and B above
Which of the following statements is true of the amount of horizontal force required to start an object sitting on a horizontal surface in motion?
A. it must be greater than the coefficient of kinetic friction B. it must be greater than the coefficient of static friction C. it must be greater than the maximum static friction force D. it must be greater than the maximum kinetic friction force
Which of the following is NOT a function of the tensor tympani and stapedius muscles?
A. protection of the inner ear against continuous loud sounds B. protection of the delicate inner ear from sudden intermittent loud sounds C. reflexive contraction when vocalizing to reduce the loudness of your own voice D. optimization of the state of the inner ear for hearing over certain frequency ranges