Living Systems

Respiratory & Circulatory Systems

Vocabulary and Content

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

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

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

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

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

ContentWhat do cells need to stay alive?

Cells need water, food, oxygen, and waste disposal to stay alive.

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.

ContentWhat 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.

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