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Biology 121 Exam 2 Study Guide (University of Oregon) 2025 Questions and Answers What two sections make up blood? - ....ANSWER☑️☑️...-Plasma and hematocrit What is plasma made of? - ....ANSWER☑️☑️...-Water with dissolved substances Percentage of plasma relative to whole cell - ....ANSWER☑️☑️...-55% What does the hematocrit include? - ....ANSWER☑️☑️...-Red blood cells What is the hematocrit? - ....ANSWER☑️☑️...-Percentage of blood that is red blood cells Typical hematocrit percentage for males - ....ANSWER☑️☑️...-40-50% Typical hematocrit percentage for females - ....ANSWER☑️☑️...-38-42% Red blood cells function - ....ANSWER☑️☑️...-Transport oxygen and some carbon dioxide in the blood, very flexible, contains hemoglobin which binds to oxygen Sickle-cell anemia - ....ANSWER☑️☑️...-Decrease in flexibility of red blood cells Buffy coat - ....ANSWER☑️☑️...-Less than 1% of blood, contains platelets and white blood cells White blood cells - ....ANSWER☑️☑️...-Combat harmful bacteria and viruses Platelets - ....ANSWER☑️☑️...-Initiate blood clotting Monocytes and Macrophages - ....ANSWER☑️☑️...-Types of white blood cells FOR STUDY PURPOSES ONLY ©️ 2025 ALL RIGHTS RESERVED 1