Which statement is true about T cells?
A) They will develop into cytotoxic T cells if antigen is complexed with class II MHC proteins.
B) Once activated, they cannot secrete cytokines.
C) Their proliferation is enhanced by interleukins 1 and 2.
D) They usually directly recognize antigens, which then activates a subpopulation of killer cells.
C
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The activity of one organ is influenced by the activity of several other organs to maintain homeostasis. This is an example of:
a. intrinsic control b. extrinsic control c. positive feedback d. lack of communication e. feed forward system
The process of coating an antigen with antibodies to make it more susceptible to phagocytosis is called:
A. Opsonization B. Self tolerance C. Anergy D. Clonal selection E. Chemotaxis
Which of the following lists the parts of a reflex arc in the correct sequence?
A) Receptor, sensory neuron, motor neuron, interneuron, effector B) Effector, sensory neuron, receptor, interneuron, motor neuron C) Effector, receptor, sensory neuron, motor neuron, interneuron D) Receptor, sensory neuron, interneuron, motor neuron, effector
"Endocrine" means
A) internal secretion. B) hormone synthesis. C) acts upon target cells. D) fast-acting compound.