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*The dark lines visible between cardiac muscle cells are called:

*A person whose red blood cells have neither A, nor B antigens, but has D antigens, on their surface is type:

*In an electrocardiogram (EKG / ECG) the t-wave represents the:

*If a blockage occurs in a vessel, it may be possible for blood to follow an alternative pathway called a(n):      

*The levels of which hormones help time when birth should occur?

*Veins are different from arteries in that they have:

*Veins are different from arteries in that they have:

*The portion of hemoglobin that binds oxygen is the:

*The excess tissue fluid from capillary exchange goes directly into:

*The autorhythmic (pacemaker) cells of the heart: