Natural _________ cells are large lymphocytes that function in nonspecific defense and that provide important defense against cancer.
Fill in the blank(s) with the appropriate word(s).
killer
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Once threshold is reached, the rising phase of the action potential in pacemaker cells is brought about by the opening of ____-type ____ channels
Fill in the blank(s) with correct word
The region of an enzyme into which the substrate fits is a
A. one-size-fits-all active site. B. highly specific active site. C. highly specific antibody. D. one-size-fits-all antibody.
Which of the following is NOT true of the ulnar notch?
A. It is a curved shallow depression. B. It is found on the radius. C. It is closer to the humerus than to the wrist. D. It articulates with the head of the ulna. E. All of these are true of the ulnar notch.
The placenta produces both
A. progesterone and prolactin. B. estrogen and progesterone. C. oxytocin and prolactin. D. prolactin and FSH. E. androgens and estrogens.