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Science exam

Teacher: Chapter 5
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Across
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Occurs when enzymes and other chemicals break down large food molecules into smaller ones
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Type of protein that regulates nearly all chemical reactions in cells; speeds up chemical reactions without being changed or used up itself
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Flow of blood to and from the tissues of the heart
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Fingerlike projections covering the wall of the small intestine that increase the surface area for food absorption
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Flow of blood through the heart to the lungs and back to the heart
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Building block of protein
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Waves of muscular contractions that move food through the digestive tract
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Inorganic nutrient that regulates many chemical reactions in the body
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Blood vessel that carries blood back to the heart, and has one-way values that keep blood moving toward the heart
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Blood vessel that carries blood away from the heart, and has thick, elastic walls made of connective tissue and smooth muscle tissue
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Mechanical and chemical breakdown of food into small molecules that cells can absorb and use
Down
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Largest part of the circulatory system, in which oxygen-rich blood flows to all the organs and body tissues, except the heart and lungs, and oxygen-poor blood is returned to the heart
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Large molecule that contains CO2, H20, O, N, and sometimes S and is made up of amino acids; used by the body for growth and for replacement and repair of body cells
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Breakdown of food through chewing, mixing and churning
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Liquid product of digestion
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Substances in foods that provide energy and materials for cell development, growth, and repair
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Microscopic blood vessel that connects arteries and veins; has walls one cell thick, through which nutrients and oxygen diffuse into body cells, and waste materials and CO2 diffuse out of body cells
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Groups of foods - such a bread, cereal, rice and pasta - containing the same type of nutrients
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Nutrient that usually is the body's main source of energy
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Two lower chambers of the heart, that contract at the same time, during a heart beat
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Nutrient that stores energy, cushions organs, and helps the body absorb vitamins
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Water-soluble or fat-soluble organic nutrient needed in small quantities for growth, for preventing some diseases, and for regulating body functions
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Two upper chambers of the heart that contract at the same time during a heart beat