Circulation

• All organisms need food, water, and oxygen to live, and these substances are transported and excreted
• The circulatory system in humans is responsible for transporting nutrients, gases, and other substances to different parts of the body
• In simple multicellular organisms like sponges and the Hydra, water acts as a medium to transport food and oxygen
• Animals like cats, dogs, and humans have a well-developed circulatory system, consisting of blood, blood vessels, and the heart
• The circulatory system in humans has three main components: blood, blood vessels, and the heart
• Blood is an opaque red liquid that transports oxygen, nutrients, carbon dioxide, and other waste products inside the human body
• The liquid portion of blood is called plasma, which is a pale-yellow liquid made up of water, dissolved proteins, and other substances
• Three kinds of cells can be found floating in plasma: red blood cells (RBCs), white blood cells (WBCs), and platelet cells
• Outlining arranges ideas sequentially from general to specific using Roman numerals, capital letters, and Arabic numbers. Outlines helps create an overview of a topic and identify themes and subtopics.