Helper T-lymphocytes are also known as
A. cytotoxic T-lymphocytes.
B. CD8+ cells.
C. CD4+ cells.
D. T8 cells.
E. memory T-lymphocytes.
C
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Undescended testes cause infertility because
A. they undergo apoptosis, and can no longer produce sperm. B. there is too little testosterone. C. sperm development is impeded by the higher internal body temperature. D. they become entangled in the seminiferous tubules, which then degenerate.
The prostate gland is the size and shape of a(n)
A. horseshoe. B. apple. C. pea. D. walnut or chestnut.
A joint in which the bone can move in two planes is said to be __________
Fill in the blank with correct word.
Electrical activity occurs at the AV node
a. during the P wave. b. between the P wave and QRS complex. c. during the QRS complex. d. between the QRS complex and T wave. e. during the T wave.