The document defines key terms related to the respiratory and circulatory systems, including cells, oxygen, carbon dioxide, heart, blood, arteries, veins, capillaries, and lungs. It explains that the circulatory system transports substances to cells and removes waste, while the respiratory system provides gas exchange between the blood and atmosphere. It also summarizes that cells need oxygen, water, food and waste removal to survive, and the circulatory system delivers these through transport of blood from the heart, through arteries and capillaries to cells, and back to the heart through veins.

1. Living Systems Respiratory & Circulatory Systems Vocabulary and Content

2. Vocabulary Cell - the basic unit of life Oxygen - an atmospheric gas needed by most living cells Carbon dioxide - a waste gas produced by living cells

3. Heart - a muscular organ that contracts rhythmically, producing a pulse with each contraction Blood - a liquid tissue that flows to and from cells in blood vessels called arteries , veins , and capillaries Arteries - carry blood away from the heart to the body

4. Veins - carry blood from the body to the heart Capillaries - connect arteries and veins. Gases, nutrients, and wastes are exchanged between capillaries and cells Four chambers of the human heart - right atrium , right ventricle , left atrium , and left ventricle

5. Circulatory system - includes tissues (blood and blood vessels) and organs (heart) that transport life-support substances to cells and removes waste Lung - organ in animals where gases, such as oxygen and carbon dioxide, pass between the atmosphere and the blood

6. Respiratory system - includes tissues and organs ( lungs ) that provide gas exchange between the blood and atmosphere Tissue - a group of similar cells working together to perform a function

7. Content What do cells need to stay alive? Cells need water, food, oxygen, and waste disposal to stay alive.

8. Content How do cells get the things they need to survive? Cells get the things they need to survive by the circulatory system which delivers water, sugar, and oxygen to cells and carries waste carbon dioxide away from cells.

9. Content What is the general path taken by blood through the circulatory system? The path the blood flows through the circulatory system is: from the body to the right atrium of the heart, to the right ventricles, to the lungs, to the left atrium, to the left ventricle, into arteries that flow into capillaries, which are in contact with cells. Blood returns to the heart in veins. Your questions?