at least one-half of one parathyroid gland is necessary to maintain normal parathormone levels
a. true
b. false
a. true
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The sensor-receptive cells in the retina that function best in dim light and enable night vision are the ________
A) Rods B) Pupil C) Iris D) Cones
________ open or close in response to binding specific molecules
A) Leak channels B) Activated channels C) Chemically gated channels D) Voltage-gated channels E) Voltage-gated and chemically gated channels
Which statement is true about T cells?
A) They usually directly recognize antigens, which then activates a subpopulation of killer cells. B) Their proliferation is enhanced by interleukins 1 and 2. C) Once activated, they cannot secrete cytokines. D) They will develop into cytotoxic T cells if antigen is complexed with class II MHC proteins.
Which of the following organs is not a digestive tract organ?
a. esophagus b. stomach c. pancreas d. small intestine e. large intestine