When calcium ion binds to troponin
A) Tropomyosin moves out of the groove between the actin molecules
B) Actin sites on the myosin are exposed
C) Actin heads will bind to myosin
D) Muscle relaxation occurs
E) Myosin shortens
A) Tropomyosin moves out of the groove between the actin molecules
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A. Frontalis B. Zygomaticus major C. Depressor anguli oris D. Orbicularis oris E. Buccinator
Chromatin becomes organized into chromosomes during:
a. interphase b. prophase c. anaphase d. telophase
When an antigen triggers an immune response, it usually activates ________ first.
A) mast cells B) plasma cells C) B cells D) T cells E) NK cells
The group of pacemaker cells near the entrance of the superior vena cava forms the ________.
A. bundle of His B. atrioventricular node C. myocardium D. sinoatrial node