Life: The Science of Biology
11th Edition
ISBN: 9781319010164
Author: David E. Sadava, David M. Hillis, H. Craig Heller, Sally D. Hacker
Publisher: W. H. Freeman
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Chapter 49.1, Problem 1R
Summary Introduction
To review:
The three ways by which the exercising muscles are supported by the circulatory system.
Introduction:
The circulatory system is an organ system, which facilitates the circulation of essential nutrients, proteins, hormones, gases, fluids, cells, and removal of wastes throughout the body via the network of tubes or vessels. The circulatory system includes heart, blood, and the blood vessels that are collectively referred to as the cardiovascular system.
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Chapter 49 Solutions
Life: The Science of Biology
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- What is the smallest current required to produce a contraction (the threshold current) in the human muscle? What proportion of the fibers in the muscle do you think were contracting to produce a small response?arrow_forwardWhich of the following is unique to cardiac musclecells?a. Only cardiac muscle contains a sarcoplasmicreticulum.b. Only cardiac muscle has gap junctions.c. Only cardiac muscle is capable ofautorhythmicityd. Only cardiac muscle has a high concentration ofmitochondria.arrow_forwardDefine the term Dilation of Muscle Capillaries?arrow_forward
- The muscular system is the one that receives the stimuli from the environment and executes a response. Select one: O True O False ort Jump to... I COLLADO ESPINAL (Log out) - (SP 2022- Prof. María Ruíz):arrow_forwardMake a table comparing three structural and three functional properties of skeletal, smooth and cardiac muscles.arrow_forwardWhat is represented on the image above? A A cross-section of a cardiac muscle B A longitudinal section of a cardiac muscle A cross-section of a skeletal muscle A longitudinal section of a skeletal muscle EA cross-section of e smooth muscle F) A longitudinal section of a smooth musclearrow_forward
- Which of the following is a correct sequence (in chronological order of occurrence) within excitation-contraction coupling? a. Synpatic vesicles fuse with the pre-synaptic membrane, Neurotransmitter binds to receptors in the post-synaptic membrane, Neurotransmitter diffuses across the synaptic cleft b. Neurotransmitter binds to receptors in the post-synaptic membrane, Synpatic vesicles fuse with the pre-synaptic membrane, Neurotransmitter diffuses across the synaptic cleft c. Synpatic vesicles fuse with the pre-synaptic membrane, Neurotransmitter diffuses across the synaptic cleft, Neurotransmitter binds to receptors in the post-synaptic membranearrow_forwardExplain why it is important for cardiac muscle to havelonger-lasting contractions than skeletal muscle.arrow_forwardWhat do you conclude happened to the number of fibers contracting as the current was raised from threshold to that required to produce a maximal contraction?arrow_forward
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