QUIZ What percentage of blood is made up of plasma? A) 45% B) 55% C) 65% D) 75% How many red blood cells are found in a single drop of blood? A) 250,000 B) 2.5 million C) 250 million D) 25 billion What is the primary function of red blood cells? A) Transporting oxygen B) Fighting infections C) Carrying nutrients D) Regulating temperature How many hemoglobin molecules are found in one red blood cell? A) 25 million B) 250 million C) 2.5 billion D) 25 billion How often is the heart expected to beat over an average lifetime of 70 years? A) 2.5 million times B) 25 million times C) 250 million times D) 2.5 billion times Which blood vessels carry oxygen-rich blood away from the heart? A) Veins B) Capillaries C) Arteries D) Lymphatics What is the role of white blood cells? A) Transporting nutrients B) Removing waste C) Fighting infections D) Delivering hormones VOCABULARY 💉 plasma: the yellowish fluid in blood that carries cells and nutrients. 🔴 red blood cells: the cells responsible for transporting oxygen throughout the body. ⚪ white blood cells: cells that play a key role in the immune system by fighting infections. 🩸 platelets: small blood components that help in blood clotting. 🧬 hemoglobin: a protein in red blood cells that binds to oxygen for transport. 🌬️ oxygen transport: the process of delivering oxygen to body cells through red blood cells. 🛡️ immune system: the body's defense system against infections and diseases. 🌐 capillaries: tiny blood vessels where the exchange of oxygen, nutrients, and waste occurs. 🚚 arteries: blood vessels that carry oxygen-rich blood from the heart to the rest of the body. 🔄 veins: blood vessels that carry oxygen-poor blood back to the heart. Приходи на обучение подробно здесь ANSWERS B) 55% C) 250 million A) Transporting oxygen B) 250 million D) 2.5 billion times C) Arteries C) Fighting infections