Campbell Biology
12th Edition
ISBN: 9780135188743
Author: Urry
Publisher: PEARSON
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Chapter 42, Problem 42.3CR
Summary Introduction
To explain: How blood pressure of an arm changes when a person places his/her forearm on their head.
Concept introduction: Blood pressure is generated by the contraction of the heart ventricle, and it supplies force in all directions. It is measured using the sphygmomanometer. Normal range of blood pressure is 120/80 mmHg, where 120 mmHg is generally referred as systolic pressure and 80 mmHg taken as diastolic pressure.
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Now try feeling for a “pulse” from a vein on the back of your forearm, the side opposite where you took your arterial pulse, so that you do not confuse the two. To find a vein, let your left arm hang by your side and relax all of the muscles in that arm. After about 20-30 seconds, your veins should be more pronounced. Place the first two fingers of your right hand on one of the larger veins to mark that spot, then place your left arm in your lap (palm down) as you take the “pulse” of this vein with the same pressure and posture as you did with the artery.
What did you feel? Explain any differences between the artery and the vein, in terms of what you know about the circulatory system and how blood pressure changes after it passes through the capillary beds.
When the pressure cuff is inflated to close the brachial artery, which arteries in the upper limb will not receive blood flow?
Let your arm hang limply by your side again until the veins become very visible, then slowly raise that arm in front of you while keeping it relaxed. As you move your arm, watch the location where you saw your veins.
What happens to your veins as your arm reaches the height of your heart? Why do you think this happens?
Let your arm hang limply by your side again until the veins become very visible. Flex your arm muscles four times in quick succession and relax again.
What did you notice about your veins right after you contracted these muscles? Why do you think this happened?
Chapter 42 Solutions
Campbell Biology
Ch. 42.1 - Prob. 1CCCh. 42.1 - Three-chambered hearts with incomplete septa were...Ch. 42.1 - Prob. 3CCCh. 42.2 - Explain why blood has a higher 02 concentration in...Ch. 42.2 - Prob. 2CCCh. 42.2 - Prob. 3CCCh. 42.3 - Prob. 1CCCh. 42.3 - Prob. 2CCCh. 42.3 - Prob. 3CCCh. 42.4 - Explain why a physician might order a white cell...
Ch. 42.4 - Prob. 2CCCh. 42.4 - Prob. 3CCCh. 42.4 - Prob. 4CCCh. 42.5 - Why is an internal location for gas exchange...Ch. 42.5 - Prob. 2CCCh. 42.5 - MAKE CONNECTIONS Describe similarities in the...Ch. 42.6 - Prob. 1CCCh. 42.6 - Prob. 2CCCh. 42.6 - Prob. 3CCCh. 42.7 - What determines whether O2 and CO2 undergo net...Ch. 42.7 - How does the Bohr shift help deliver O2 to very...Ch. 42.7 - Prob. 3CCCh. 42 - How does the flow of a fluid in a closed...Ch. 42 - Prob. 42.2CRCh. 42 - Prob. 42.3CRCh. 42 - Prob. 42.4CRCh. 42 - Prob. 42.5CRCh. 42 - How does air in the lungs differ from the fresh...Ch. 42 - How are the roles of a respiratory pigment and an...Ch. 42 - Prob. 1TYUCh. 42 - Blood returning to the mammalian heart in a...Ch. 42 - Prob. 3TYUCh. 42 - When you hold your breath, which of the following...Ch. 42 - Prob. 5TYUCh. 42 - Prob. 6TYUCh. 42 - Prob. 7TYUCh. 42 - DRAW IT Plot blood pressure against time for one...Ch. 42 - EVOLUTION CONNECTION One opponent of the movie...Ch. 42 - Prob. 10TYUCh. 42 - Prob. 11TYUCh. 42 - WRITE ABOUT A THEME: INTERACTIONS Some athletes...Ch. 42 - Prob. 13TYU
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