Why would a patient with no thymus lack an effective humoral immune response?
A. B cells develop into plasma cells in the thymus.
B. T cells are responsible for humoral immunity.
C. B cells are produced in the thymus.
D. Certain T cells are required to activate B cells into antibody-producing cells.
Ans: D. Certain T cells are required to activate B cells into antibody-producing cells.
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The trigger zone of a neuron includes which of the following?
A. The dendrites B. The synaptic knobs C. Each node of Ranvier D. Each internode E. The axon hillock
Answer the following statements true (T) or false (F)
1. One of the first signs of labor is the rupture of the “bag of waters.” 2. The birth weight of a baby usually triples by age 4 months. 3. Boys start and finish their early-teen growth spurt earlier than girls. 4. In older adulthood, the costal cartilage begins to soften, leading to a condition called “barrel chest.” 5. The prenatal period is the time before birth.
An electroencephalogram measures
A. electrical activity in the brain. B. the use of glucose in the brain. C. the production of CSF in the brain. D. blood flow in the brain.
What type of reaction is shown?A + B + C ? ABC ? AB + C
A. Synthesis B. Reversible C. Decomposition D. Exchange