Patient Care Technician (PCT) AAH Practice Exam

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What term refers to the liquid portion of blood?

Plasma
Sera
Interstitium
Hemolymph

The correct answer is: Plasma

The term that refers to the liquid portion of blood is plasma. Plasma comprises about 55% of the total blood volume and is primarily made up of water, in which nutrients, hormones, proteins, and waste products are dissolved. Plasma serves several crucial functions in the body, including transporting nutrients and hormones to cells, aiding in blood clotting through proteins, and regulating body temperature and pH. The other terms listed are related but represent different biological contexts. Sera refers to the clear fluid that remains after blood has clotted, which is different from plasma that contains clotting factors. Interstitium refers to the space between cells where interstitial fluid is found, which is not part of the blood. Hemolymph is a fluid found in some invertebrates, such as insects and mollusks, that serves a function similar to blood and interstitial fluid in those organisms, but it is not applicable to humans or mammals. Understanding these distinctions is important for comprehending the specific roles and components of bodily fluids.