What is the central mechanism for establishing self-tolerance?
A. Self-reactive T cells and B cells are killed during development.
B. Individuals that have immune systems that respond to self-antigens do not survive to reproduce.
C. Immune cells that react to self-antigens are turned off when they recognize self-tissues.
D. Certain immune suppressive cytokines are maintained in tissues to dampen auto reactive immune responses.
E. Peripheral tissues have mechanisms to kill T or B cells that respond to them.
A
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A. sexual orientation. B. biological sex. C. gender identity. D. puberty.
According to programmed theories of aging, longevity:
a. is determined by a biological clock that ticks at a rate governed by the organism's genes. b. has a tendency to run in families. c. is linked to genes and learning more about which ones control aging, which could increase the lifespan. d. all of these choices
A vague, generalized pain often along the midline is known as:
A) Somatic pain B) Referred pain C) Visceral pain D) Peritoneal pain
?Even while we sleep, thoughts in the unconscious mind can produce muscle tension.
Answer the following statement true (T) or false (F)