If one nerve stimulus arrives at a muscle fiber so soon that the fiber does NOT relax at all from the previous twitch, the most likely result will be ________.
A. fatigue
B. complete tetanus
C. wave summation
D. spasm
E. incomplete tetanus
Answer: B
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The most abundant high-energy compound in cells is
A) DNA. B) adenosine diphosphate. C) adenosine monophosphate. D) adenosine triphosphate. E) RNA.
A function of the hypothalamohypophysial tract is to
A. move releasing hormones from the hypothalamus to the posterior pituitary. B. carry action potentials to the posterior pituitary, causing the release of oxytocin. C. move ADH from the hypothalamus to the anterior pituitary. D. cause the release of insulin from the anterior pituitary. E. form a vascular connection from the hypothalamus to the posterior pituitary.
A cell has engulfed a substance from the extracellular material and has migrated to a lymph node to interact with a helper T cell. Which of the following statements best describes this cell?
A. This is a cytotoxic T cell that interacts with the helper T cell through an MHC class II molecule. B. This is a cytotoxic T cell that interacts with the helper T cell through an MHC class I molecule. C. This is an antigen-presenting cell that interacts with the helper T cell through an MHC class I molecule. D. This is an antigen-presenting cell that interacts with the helper T cell through an MHC class II molecule.
Sensory receptors that release neurotransmitters in response to receptor potentials are called ______ receptors
A. direct B. indirect C. secondary D. primary