Biology: The Dynamic Science (MindTap Course List)
4th Edition
ISBN: 9781305389892
Author: Peter J. Russell, Paul E. Hertz, Beverly McMillan
Publisher: Cengage Learning
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Textbook Question
Chapter 44, Problem 6TYK
Keeping the mammalian cardiac cycle balanced is/are:
a. an AV node between the right atria atrium and right ventricle, which induces a wave of contraction.
b. pacemaker cells, which compose the AV node and signal theSA node.
c. an insulating layer that isolates the SA node from the rightatrium.
d. ion channels in pacemaker cells, which close to depolarizetheir plasma membranes.
e. neurogenic stimuli from the nervous system.
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Which of the following is a predicted outcome in a mammal heart that entirely lacks valves?
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Oxygenated and spent (deoxygenated) blood would mix.
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Chapter 44 Solutions
Biology: The Dynamic Science (MindTap Course List)
Ch. 44.1 - What are the three basic features of animal...Ch. 44.1 - Prob. 2SBCh. 44.1 - Prob. 3SBCh. 44.1 - Prob. 4SBCh. 44.2 - Outline the life cycle of an erythrocyte.Ch. 44.2 - Prob. 2SBCh. 44.2 - Prob. 3SBCh. 44.3 - Prob. 1SBCh. 44.3 - Prob. 2SBCh. 44.3 - How do neurogenic and myogenic hearts differ?
Ch. 44.3 - Describe the electrical events that occur during...Ch. 44.4 - Prob. 1SBCh. 44.4 - Prob. 2SBCh. 44.4 - Prob. 3SBCh. 44.5 - Prob. 1SBCh. 44.5 - Prob. 2SBCh. 44.5 - Prob. 3SBCh. 44.6 - Prob. 1SBCh. 44 - Prob. 1TYKCh. 44 - Prob. 2TYKCh. 44 - Prob. 3TYKCh. 44 - A characteristic of blood circulation through or...Ch. 44 - The heartbeat includes: a. the systole when the...Ch. 44 - Keeping the mammalian cardiac cycle balanced...Ch. 44 - Prob. 7TYKCh. 44 - Characteristics of veins and venules are: a. thick...Ch. 44 - Prob. 9TYKCh. 44 - Prob. 10TYKCh. 44 - Prob. 11TYKCh. 44 - Prob. 12TYKCh. 44 - Prob. 13TYKCh. 44 - Prob. 15TYKCh. 44 - Nifedipine is an antihypertension medication that...Ch. 44 - Prob. 2ITDCh. 44 - Nifedipine is an antihypertension medication that...
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- Blood returning to the mammalian heart in a pulmonary veindrains first into the(A) left atrium.(B) right atrium.(C) left ventricle.(D) right ventricle.arrow_forwardA rhythmic beating of cardiac muscle in a mammalian heart is initiated by the _____. A.Atrioventricular node B.Parasympathetic nervous system C.Purkinje fibers D.Sinoatrial nodearrow_forwardDescribe all the events (steps) that occur during a cardiac cycle for mammals (organisms with a double circulation). Please include in your description all the steps illustrated in slide #16 of the Cardiovascular System PowerPoint presentation (Lectures 5&6), as well as the opening and closing of all heart valves (refer to slide #21), and the signals arising from the SA and AV nodes (shown in slide #25). How does this cycle contribute to metabolic homeostasis for our cells, and what is the purpose of the valves?arrow_forward
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- Double-loop circulatory systems are found in adult amphibians, reptiles, birds, and mammals, In which characteristic do these systems differ from one another,arrow_forwardHow does an open circulatory system differ from a closed one? A)A closed circulatory system is completely encased in the body cavity whereas the open one is not. B)The open circulatory system has a combination of blood vessels and large thin-walled sinuses whereas a closed circulatory system has only vessels. C)An open circulatory system opens into the heart whereas the closed circulatory system does not. D)An open circulatory system drains into the mantle cavity whereas a closed circulatory system drains into the hemolymph. E)An open circulatory system opens into arteries and is drained by veins whereas in a closed one it is just the reverse.arrow_forwardPlease define the term closed circulatory system. Which animals have it, and what are its’ evolutionary advantages over open systems (why might a closed system be more efficient)?arrow_forward
- The systemic circuit of mammals______ . a. carries blood to the lungs and back b. is shorter than the pulmonary circuit c. carries blood to body tissues and back d. allows oxygenated and oxygen-poor blood to mixarrow_forwardQuestion 4 of 25 Use the diagram to answer the question. Some organisms use a single loop circulatory system such as the one shown. How is the transport of gases in such a design different from that in the circulatory systems found in humans? A. The transport of gases is more efficient because oxygenated blood mixes with deoxygenated blood. B. The transport of gases is less efficient because oxygenated blood mixes with deoxygenated blood. C. The transport of gases is more efficient because the distance between the heart and the capillaries is shorter. D. The transport of gases is less efficient because the distance between the heart and the capillaries is shorter.arrow_forwardDescribe the actions of the frog heart chambers during a cardiac cycle.arrow_forward
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