Question 22ListenWhich of the following statements are true with respect to cardiac muscle?Select all that applyA Cardiac muscle is under voluntary controlDCardiac muscle contains intercalaned discs.Cardiac muscle is located in the heartCardiac muscle lacks striations.00000

Cardiac muscle is a specialized type of muscle tissue that constitutes the myocardium, the middle layer of the heart wall. Unlike skeletal muscle, which is under voluntary control, and smooth muscle, which is found in various organs and operates involuntarily, cardiac muscle has unique properties tailored to its role in the heart's function.Structural Characteristics:Striations: Similar to skeletal muscle, cardiac muscle cells exhibit striations, or alternating dark and light bands, when viewed under a microscope. This striated appearance is due to the organized arrangement of contractile proteins within the cells. Intercalated Discs: One distinctive feature of cardiac muscle is the presence of intercalated discs. These are specialized junctions that connect adjacent cardiac muscle cells. Intercalated discs play a vital role in synchronizing the contractions of individual cells, allowing the heart to function as a coordinated pump.Functional Significance:Involuntary Contraction: Cardiac muscle contracts involuntarily, meaning that its contractions are not under conscious control. This involuntary nature is essential for the continuous and rhythmic beating of the heart, which pumps blood throughout the circulatory system.Pumping Action: The primary function of cardiac muscle is to pump blood. The heart undergoes a cycle of contraction (systole) and relaxation (diastole) to propel blood through the chambers of the heart and into the blood vessels. The coordinated contraction of cardiac muscle ensures efficient and effective circulation.Endurance and Fatigue Resistance: Cardiac muscle is designed for endurance, as the heart must contract continuously throughout a person's lifetime. Unlike skeletal muscle, which can fatigue relatively quickly, cardiac muscle is adapted to sustained activity without becoming exhausted. Regulation of Contraction:Autonomic Nervous System: The autonomic nervous system, specifically the sympathetic and parasympathetic branches, plays a crucial role in regulating the rate and force of cardiac muscle contractions. Hormones such as adrenaline also influence cardiac activity.Specialized Conduction System: The heart contains a specialized conduction system that coordinates the electrical impulses responsible for initiating and propagating muscle contractions. The sinoatrial (SA) node, atrioventricular (AV) node, and bundle of His are key components of this system. Thus of the above options the correct ones are the B. and C. These are the options which are Cardiac muscle contains intercalated discs.Cardiac muscle are located in the heart. The correct options from the above is as :) B. & C. B. Cardiac muscle contains intercalated discs.C. Cardiac muscles are located in the heart..

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Question 22 Which of the following statements are true with respect to cardiac muscle? Select all that apply A Cardiac muscle is under voluntary control B Cardiac muscle contains intercalated discs. C Cardiac muscle is located in the heart D Cardiac muscle lacks striations.

Question 22 Which of the following statements are true with respect to cardiac muscle? Select all that apply A Cardiac muscle is under voluntary control B Cardiac muscle contains intercalated discs. C Cardiac muscle is located in the heart D Cardiac muscle lacks striations.

Human Anatomy & Physiology (11th Edition)

11th Edition

ISBN:9780134580999

Author:Elaine N. Marieb, Katja N. Hoehn

Publisher:Elaine N. Marieb, Katja N. Hoehn

Chapter1: The Human Body: An Orientation

Section: Chapter Questions

Problem 1RQ: The correct sequence of levels forming the structural hierarchy is A. (a) organ, organ system,...

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Question 42 Why do cardiac muscle fibers have a long refractory period? To allow time for blood filling Refractory period is not longer Its nerve supply is poorer Due to ATP insufficiency To prevent muscle fatigue |0|0
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Question 5 Which of these processes need ATP most? O Detachment of myosin head Release of calcium O None of these needs ATP Release of acetylcholine O Attachment of myosin head
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QUESTION 15 What section of a sarcomere does not shorten during muscle contraction? Al Al Z disk zone zone Zone 1band A band- band Sarcomere Z-disk to Z-disk (sarcomere) O A band I band H zone OUEETIO LIE
Question 3 Which of these is an example of isotonic muscle contraction? O Swinging a bar Swimming O Running a race O Picking up sticks O Sitting in class
QUESTION 8 How does the nervous system grade the force of muscle contraction? O a. Only by recruiting additional motor units O b. Only by varying the firing rate of the motor neurons O c. By varying the firing rate of the motor neurons and by recruiting additional motor units O d. By using more motor neuron pools
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