What 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 E A cross-section of e smooth muscle F A longitudinal section of a smooth muscle

What 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 E A cross-section of e smooth muscle F A longitudinal section of a smooth muscle

Biology: The Unity and Diversity of Life (MindTap Course List)

15th Edition

ISBN:9781337408332

Author:Cecie Starr, Ralph Taggart, Christine Evers, Lisa Starr

Publisher:Cecie Starr, Ralph Taggart, Christine Evers, Lisa Starr

Chapter31: Animal Tissues And Organ Systems

Section: Chapter Questions

Problem 8SQ: ______ muscle pulls on bones and _______ muscle regulates the diameter of blood vessels. a. Skeletal...

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Question

What 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 muscle

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Which of the following is true of cardiac muscle? о а. Cardiac cells are electrically connected via intercalated disks o b. All of these statements are true It is the only type of tissue that produces spontaneous action potentials o d. It is made of multinucleate cells It lacks sarcoplasmic reticulum Ос. Ое.
The EMG is a recording of: * The action potentials of the motor nerves supplying the muscle fibers. The action potentials of the innervated muscle fibers. The contractions of the innervated muscle fibers O The action potential of the pacemaker cells O The electrical activity in the sarcoplasmic reticulum
The layers of smooth muscle in blood vessels have what two, opposing functions? O None of these is correct O Pumping blood and lymphatic fluid Flexion and extension O Vasodilation and vasoconstriction O Increasing and decreasing flow velocity
Cardiac muscle is different from smooth muscle in that cardiac muscle is: acted on by the autonomic nervous system often interconnected by gap junctions under involuntary control O arranged in sarcomeres
Ans Column I Column II Ca binds to calmodulin 1. Elastic fibers that anchor thick filaments in place Ca binds to troponin 2. Occurs in smooth muscles only Oxidative type I muscle fibers 3. Is the primary source of Ca that drives muscle contraction Titin 4. Is a dense connective tissue that surrounds the entire muscle H zone 5. Anchors thin filaments together Z line 6. Have high concentration of mitochondria Sarcomere 7. The region of thick filaments that has no overlap with thin filaments Actin and myosin 8. Is the functional unit of skeletal muscle Epimysium 9. Occurs in skeletal and cardiac muscles Sarcoplasmic reticulum 10. Generate the mechanical force of a muscle through crossbridge cycling Matching between Column I and corresponding definition or function in column II ?
Ans Column I Column II Ca binds to calmodulin 1. Elastic fibers that anchor thick filanments in place Ca binds to troponin 2. Occurs in smooth muscles only Oxidative type I muscle fibers 3. Is the primary source of Ca that drives muscle contraction Titin 4. Is a dense connective tissue that surrounds the entire muscle H zone 5. Anchors thin filaments together Z line 6. Have high concentration of mitochondria Sarcomere 7. The region of thick filaments that has no overlap with thin filaments Actin and myosin 8. Is the functional unit of skeletal muscle Epimysium 9. Occurs in skeletal and cardiac muscles Sarcoplasmic reticulum 10. Generate the mechanical force of a muscle through crossbridge cycling
Can cardiac muscle exhibit (normally or under experimental conditions) summation or complete tetanus as does skeletal muscle? Why not? (highlight the main concepts)
In which type(s) of muscle cells does each cell have its own neuromuscular junction? skeletal only unitary smooth and skeletal skeletal and cardiac 2. The follow is NOT true of CARDIAC muscle fibers: - connected by gap junctions - include pacemaker cells that can produce produce action potentials at regular intervals without innervation - without calcium cross bridge cycles will not occur and fibers will not shorten - each cell in a motor unit has a neuromuscular junction with the same motor neuron actin and myosin filaments are arranged in sarcomeres produce greater force when stretched than at resting length 3. Match the following: -Skeletal muscle -Cardiac muscle -Smooth muscle Can maintain prolonged isometric contractions with very little energy Striated muscle fibers with gap…
You cut the axon of a single motor neuron innervating the biceps muscle. Which of the following is true? a. The biceps muscle will no longer be able to contractb. Only one muscle fiber in the biceps will be unable to contractc. All muscle fibers in the biceps innervated by that motor neuron will no longer be able to contractd. There will be no effect since each muscle fiber is innervated by multiple motor neurons
Cardiac muscle cells produce more force when they have already shortened to less A than half of their resting length when they are stimulated more calcium is released into the fluid B around their actin and myosin filaments they are stimulated to contract before C their refractory period has ended more acetylcholine is released from D nearby neurons
A significant structural feature in the microscopic studyof cardiac muscle cells is the presence of gap junctionsbetween neighboring cells. Why are these junctions soimportant?
On a cellular level, explain contraction of heart of a individual muscle fiber?