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Unit A Chapter 3 Review
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When you hold your breath, your brain sends a message to the diaphragm and rib muscles telling them to breathe. Why is this message sent from the brain?
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because carbon dioxide is building up in the blood.
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Which type of blood vessel takes blood from the cells back to the heart?
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vein
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Around the wall of each air sac in the lungs is a web of …
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capillaries
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When does digestion begin?
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when the teeth grind the food
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How does food move through the esophagus?
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Rings of muscles squeeze food down the esophagus.
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Which organs send chemicals to the small intestine to help digest food?
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pancreas and liver
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What is the role of villi in the small intestine?
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The villi provide more surface area to absorb food.
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The transportation system of the body is …
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circulatory system
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Which system in the human body is involved in removing wastes from the body?
urinary nervous skeletal circulatory
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urinary
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Name three tasks the kidneys perform.
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Clean the blood Regulate the level of salt in the blood Control the level of water in the blood
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Which organ stores a mix of wastes and water until the mix of waste and water is ready to leave the body?
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Urinary bladder
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Which type of cell will the body make in greater numbers in response to an infection?
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white blood cells
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What is the thick, sticky fluid that traps germs and other things that may be in the air?
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mucus
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Which part of your blood has the job of clotting your blood?
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platelets
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