The hormone that signals that fertilization and implantation have taken place is
A. pluripotent prolactin.
B. human chorionic gonadotropin.
C. gonadotropin releasing hormone.
D. progesterone.
E. pre-embryonic pellucida factor.
B
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The function of helper T-lymphocytes is to
A. initiate and oversee the immune response. B. turn off the immune response once it has been activated. C. secrete toxins to kill or disable pathogens. D. trigger cell death by disrupting metabolic activities. E. All choices are correct.
What causes muscle contractions to be graded?
A) both increasing stimulus strength and increasing stimulus frequency B) increasing stimulus strength C) increasing stimulus frequency
The ultimate source of the fluids secreted into the digestive tract is the plasma
Indicate whether the statement is true or false
Which of the following functions as a motor protein in all three types of muscle tissue?
a) actin b) myosin c) troponin d) titin e) tropomyosin