The property that allows the heart to initiate each heartbeat itself is called ________.
Fill in the blank(s) with the appropriate word(s).
autorhythmicity
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The lumbar regions are located lateral to the umbilical region.
Answer the following statement true (T) or false (F)
The pelvic girdle consists of each of these bones EXCEPT the ________.
A. clavicle B. ischium C. ilium D. pubis
Opsonization involves
A. cross-linking several antigens together so that they are no longer soluble, and it is facilitated by the Fc region of the antibody. B. marking a target for phagocytosis, and it is facilitated by interaction of the Fc region of the antibody with a phagocyte. C. activation of NK cells, and it is a function of the antigen-binding site of the antibody. D. fixation of antibodies in the IgG and IgM classes, and it involves the antigen-binding site of the antibody.
What keeps the HCN channels open?
A. G-proteins B. cAMP C. Ca2+ D. ATP