Identify the organ circled in the image below. Note: you must include right or left as appropriate. Fill in the blank

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A. Fibrinogen, globulins, and albumin: those are plasma proteins, not electrolytes (they’re large molecules, not ions).
B. Bicarbonate, magnesium, chloride, and potassium ions: these are ions dissolved in plasma and are classically considered electrolytes.
C. Monocytes, basophils, and eosinophils: those are white blood cells (formed elements), not electrolytes.
D. Creatinine, urea, and uric acid: those are nitrogenous waste/metabolites present in plasma, not electrolytes.

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.