Trace Digestion and Respiration - Middle School Life Science
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Which organ is the main site of nutrient absorption into the bloodstream?
Which organ is the main site of nutrient absorption into the bloodstream?
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Small intestine. Its extensive surface area and blood supply maximize nutrient uptake.
Small intestine. Its extensive surface area and blood supply maximize nutrient uptake.
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What is the overall reactants-to-products equation for cellular respiration?
What is the overall reactants-to-products equation for cellular respiration?
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Glucose + oxygen → carbon dioxide + water + ATP. Summarizes the complete chemical transformation in cellular respiration.
Glucose + oxygen → carbon dioxide + water + ATP. Summarizes the complete chemical transformation in cellular respiration.
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What is cellular respiration?
What is cellular respiration?
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Process that uses glucose and oxygen to make ATP. Cells break down glucose with oxygen to release energy stored in ATP.
Process that uses glucose and oxygen to make ATP. Cells break down glucose with oxygen to release energy stored in ATP.
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Identify the monomers produced when proteins are digested.
Identify the monomers produced when proteins are digested.
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Amino acids. Proteins are hydrolyzed into these building blocks for absorption.
Amino acids. Proteins are hydrolyzed into these building blocks for absorption.
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Identify the monomer produced when carbohydrates are digested.
Identify the monomer produced when carbohydrates are digested.
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Simple sugars (such as glucose). Enzymes break complex carbs into these basic sugar units.
Simple sugars (such as glucose). Enzymes break complex carbs into these basic sugar units.
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Which organ system brings oxygen into the body for cellular respiration?
Which organ system brings oxygen into the body for cellular respiration?
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Respiratory system. Lungs extract oxygen from air for cellular energy production.
Respiratory system. Lungs extract oxygen from air for cellular energy production.
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Identify the main products when fats (lipids) are digested.
Identify the main products when fats (lipids) are digested.
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Fatty acids and glycerol. Lipases break triglycerides into these smaller, absorbable molecules.
Fatty acids and glycerol. Lipases break triglycerides into these smaller, absorbable molecules.
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Where does gas exchange occur in the lungs?
Where does gas exchange occur in the lungs?
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Alveoli. These tiny air sacs provide maximum surface area for gas diffusion.
Alveoli. These tiny air sacs provide maximum surface area for gas diffusion.
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Identify the correct path for glucose: mouth → stomach → small intestine → blood → ?.
Identify the correct path for glucose: mouth → stomach → small intestine → blood → ?.
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body cells (for cellular respiration or building molecules). Glucose fuels ATP production or becomes structural components.
body cells (for cellular respiration or building molecules). Glucose fuels ATP production or becomes structural components.
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Identify the correct path for oxygen: mouth/nose → ? → alveoli → blood → cells.
Identify the correct path for oxygen: mouth/nose → ? → alveoli → blood → cells.
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trachea and bronchi. Air passages that conduct oxygen from upper airways to gas exchange sites.
trachea and bronchi. Air passages that conduct oxygen from upper airways to gas exchange sites.
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Which waste product of cellular respiration can leave the body in urine, sweat, or exhaled air?
Which waste product of cellular respiration can leave the body in urine, sweat, or exhaled air?
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Water. Multiple excretory routes remove this metabolic byproduct.
Water. Multiple excretory routes remove this metabolic byproduct.
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Which waste product of cellular respiration is exhaled from the lungs?
Which waste product of cellular respiration is exhaled from the lungs?
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Carbon dioxide. This gas diffuses from cells to blood to lungs for removal.
Carbon dioxide. This gas diffuses from cells to blood to lungs for removal.
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In a body cell, which organelle is the main site of cellular respiration?
In a body cell, which organelle is the main site of cellular respiration?
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Mitochondrion. This organelle contains enzymes for the aerobic breakdown of glucose.
Mitochondrion. This organelle contains enzymes for the aerobic breakdown of glucose.
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Which body system transports absorbed nutrients and oxygen to body cells?
Which body system transports absorbed nutrients and oxygen to body cells?
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Circulatory system. Blood vessels deliver materials needed for cellular respiration.
Circulatory system. Blood vessels deliver materials needed for cellular respiration.
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What is the main role of the liver in processing absorbed nutrients?
What is the main role of the liver in processing absorbed nutrients?
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Stores, converts, and regulates nutrient levels in the blood. The liver acts as a metabolic hub and nutrient processing center.
Stores, converts, and regulates nutrient levels in the blood. The liver acts as a metabolic hub and nutrient processing center.
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What happens to large food molecules during digestion before absorption?
What happens to large food molecules during digestion before absorption?
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They are broken into monomers (small soluble molecules). Enzymes break polymers into smaller units that can cross cell membranes.
They are broken into monomers (small soluble molecules). Enzymes break polymers into smaller units that can cross cell membranes.
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What structures increase small intestine surface area for absorption?
What structures increase small intestine surface area for absorption?
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Villi and microvilli. These finger-like projections greatly expand absorption surface area.
Villi and microvilli. These finger-like projections greatly expand absorption surface area.
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What is mechanical digestion?
What is mechanical digestion?
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Physical breakdown of food into smaller pieces. Uses teeth, tongue, and churning without chemical changes.
Physical breakdown of food into smaller pieces. Uses teeth, tongue, and churning without chemical changes.
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What is the correct order of the digestive tract from mouth to anus?
What is the correct order of the digestive tract from mouth to anus?
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Mouth → esophagus → stomach → small intestine → large intestine → rectum → anus. Food travels through this sequence during digestion.
Mouth → esophagus → stomach → small intestine → large intestine → rectum → anus. Food travels through this sequence during digestion.
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After absorption, how does glucose usually travel from the small intestine to body cells?
After absorption, how does glucose usually travel from the small intestine to body cells?
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Through the bloodstream (plasma) to cells. Absorbed into capillaries, then transported via circulation.
Through the bloodstream (plasma) to cells. Absorbed into capillaries, then transported via circulation.
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Which macromolecule is digested into amino acids?
Which macromolecule is digested into amino acids?
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Proteins. Proteases break peptide bonds between amino acids.
Proteins. Proteases break peptide bonds between amino acids.
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What is absorption in digestion?
What is absorption in digestion?
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Movement of nutrients from intestine into blood or lymph. Nutrients cross intestinal wall into circulatory system.
Movement of nutrients from intestine into blood or lymph. Nutrients cross intestinal wall into circulatory system.
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What is the main function of the large intestine (colon)?
What is the main function of the large intestine (colon)?
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Absorbs water and forms feces. Removes remaining water from undigested material.
Absorbs water and forms feces. Removes remaining water from undigested material.
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What is chemical digestion?
What is chemical digestion?
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Enzyme-driven breakdown of macromolecules into monomers. Enzymes break bonds between molecules chemically.
Enzyme-driven breakdown of macromolecules into monomers. Enzymes break bonds between molecules chemically.
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Identify the structures that increase small intestine surface area for absorption.
Identify the structures that increase small intestine surface area for absorption.
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Villi and microvilli. Finger-like projections maximize surface area for nutrient absorption.
Villi and microvilli. Finger-like projections maximize surface area for nutrient absorption.
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