Chemoreceptors could be stimulated when which one of the following chemical imbalances occurs?

The bony tube composed of 33 vertebrae is the:

a. spinal column b. spinal cord c. spinal body d. spinal process

Mixed field reaction is commonly seen in the forward ABO test if a group _________ patient has received an emergency transfusion of group ____ cells

a. A, A b. A, B c. A, O d. O, O