When they leave the red marrow, pre-T-lymphocytes have
A. only the CD4 protein.
B. only the CD8 protein.
C. either the CD4 or CD8 protein.
D. both the CD4 and CD8 proteins.
E. neither the CD4 nor CD8 protein.
Answer: D
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Which of the following statements is correct with respect to the sites of synthesis of B and T cells?
A) In bony fish, B cells are produced in the kidney or spleen. B) In most vertebrates, B cells are produced in body cells, but in different locations of the body. C) Jawless fish produce T cells in the thymus. D) Bony and cartilaginous fish produce T cells in the gill region, referred to as the thymoids.
Autonomic reflexes are also called ________ reflexes.
Fill in the blank(s) with the appropriate word(s).
Which of the following is not one of the three criteria used to describe receptors?
A. Modality of stimulus (stimulating agent) B. Stimulus strength (intensity of stimulus) C. Stimulus origin (location of stimulus) D. Receptor distribution (body location)
Factors that alter water balance will also alter electrolyte balance.
Answer the following statement true (T) or false (F)