CD4 is normally used by the helper t-cell to recognize and bind to ________.
A) Foreign antigen
B) Interleukin 2
C) Interferon
D) MHC I
E) MHC II
Answer: E) MHC II
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During days 15-28 of the uterine cycle, increased production of progesterone causes the endometrium to double in thickness.
a. true b. false
Why does damaged cartilage heal slowly?
A) Chondrocytes cannot be replaced if killed, and other cell types must take their place. B) Cartilage is avascular, so nutrients and other molecules must diffuse to the site of injury. C) Damaged cartilage becomes calcified, thus blocking the movement of materials required for healing. D) Chondrocytes divide more slowly than other cell types, delaying the healing process. E) Damaged collagen cannot be quickly replaced, thus slowing the healing process.
The muscles of the pectoralis group originate on which bone?
A) humerus B) sternum C) clavicle D) cervical vertebra E) mandible
Which structure is medial to the eyes?
A) ears B) nose C) eyebrows D) shoulders