The blue areas in the image represent the body parts that transport deoxygenated blood throughout the body. what are they called?

The answer is Vein

Explanation:

Pulmonary circulation is the part of the circulatory system that carries deoxygenated blood from the heart to the lungs, and then returns oxygenated back to the heart. A vein is a blood vessel that conducts blood from the capillaries to the heart and is characterized by containing deoxygenated blood because they carry carbon dioxide and metabolic wastes from the tissues, in the direction of the organs responsible for their removal.

it also supports my hypothesis. if you rest first you can squeeze the clothespin more times. from the data i collected the average of the eight people concluded exercise makes your muscles more fatigued and less able to squeeze the clothespin compared to resting before squeezing.

the answer will be a) proteins i believe