Challenge 2 unit 4_ challenge two unit four human biology Sophia pathway from sophia.org

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Saylor Academy *

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Chemistry

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Nov 24, 2024

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1. The cardiovascular system is responsible for moving __________ through the body. a.) blood correct answer b.) air c.) food d.) lymph 2. Which of the following describes the atrium? a.) The thick wall that divides the heart in half b.) The upper chamber of each half of the heart correct answer c.) The valve that separates the upper and lower chambers of the right half of the heart d.) The lower chamber of each half of the heart 3. What is the role of the AV node in the heart? a.) It causes the chambers of the heart to relax after a contraction. b.) It produces two electric signals: first for the atria to contract and second for the ventricles to contract. Correct answer c.) It slows down the electric signal to the ventricles so they beat after the atria. Correct answer d.) It originates the electric signal that causes the heart to beat.
4. How do blood vessels maintain homeostasis when blood pressure decreases? a.) Hypotension b.) Vasodilation c.) Hypertension d.) Vasoconstriction correct answer 5. What is a heart attack? a.) When buildup of plaque causes a blood clot in the heart b.) When high blood pressure exhausts the heart's ability to pump c.) When the heart isn't able to get enough oxygen to function properly. Correct answer d.) When a weak spot in the walls of the heart bursts
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