During the development of lymphocytes, some pre-T and pre-B cells survive and develop into cells capable of an immune response; this is referred to as ________ selection. However, some cells are suppressed from responding to self antigens; this is referred to as ________ selection.
A. negative; neutral
B. negative; positive
C. neutral; positive
D. neutral; negative
E. positive; negative
Answer: E
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Our inner ear is protected from very loud noises by
A) the tensor tympani stiffening the tympanic membrane. B) the stapedius reducing movement of the stapes. C) the tensory tympani stiffening the tympanic membrane and the stapedius reducing movement of the stapes. D) cerumen in the auditory canal. E) contraction of the auditory tube.
The adductor magnus originates at the ________ of the ischium.
Fill in the blank(s) with the appropriate word(s).
Which of the following cannot act as antigen-presenting cells?
A) B cells B) Dendritic cells C) Reticular cells D) T cells E) Macrophages
Which statement about taste cells is false?
A. They secrete a neurotransmitter to stimulate the sensory neuron at their base. B. They are the bumps that cover the surface of the tongue. C. They are epithelial cells with sensory neurons at their base. D. They have taste hairs on their surface.