This gastric juice component is produced by the chief cells of the gastric glands in an inactive form:

A. Both antigens A and B: type AB RBCs express both A and B surface antigens.
B. Neither antigens A nor antigens B: that describes type O, not AB.
C. Antigens A only: that describes type A, not AB.
D. Antigens B only: that describes type B, not AB.

A. Radial: The radial pulse is palpated at the lateral (thumb) side of the wrist between the tendons of the flexor carpi radialis and the abductor pollicis longus -it is superficial and commonly used clinically, so this is the correct pulse for a wrist/forearm highlighted area.
B. Ulnar: The ulnar pulse lies on the medial (pinky) side of the wrist and is deeper and often harder to palpate than the radial; it would not be the best choice if the highlighted area is lateral at the thumb side.
C. Brachial: The brachial pulse is felt on the medial aspect of the arm (at the antecubital fossa or just medial to the biceps tendon) and is used for infants or blood pressure -it is not located at the distal wrist.
D. Dorsalis pedis: The dorsalis pedis pulse is on the dorsum of the foot (between the tendons over the instep) and is unrelated to a wrist/forearm highlighting.