19. Which of the following is true about cardiac muscle? A. It is voluntary and striated B. It is involuntary and striated C. It is voluntary and non-striated D. It is involuntary and non-striated 20. Where does the electrical impulse of the heart start? A Sinoatrial node B. Atrioventricular node C. Purkinje fiber D. Left bundle branch 21. What is unique about veins? A. They contain a tunica media B. They contain a tunica external C. They contain a tunica interna D. They contain valves

19. Which of the following is true about cardiac muscle? A. It is voluntary and striated B. It is involuntary and striated C. It is voluntary and non-striated D. It is involuntary and non-striated 20. Where does the electrical impulse of the heart start? A Sinoatrial node B. Atrioventricular node C. Purkinje fiber D. Left bundle branch 21. What is unique about veins? A. They contain a tunica media B. They contain a tunica external C. They contain a tunica interna D. They contain valves

Body Structures & Functions Updated

13th Edition

ISBN:9780357191606

Author:Scott

Publisher:Scott

Chapter7: Muscular System

Section: Chapter Questions

Problem 1RQ

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Cardiac muscle cells differ from skeletal muscle cells because: a. They can respond to neurotransmitters.b. They are striated.c. They contain intercalated discs and gap junctions.d. They require calcium for contraction.
The action potential of skeletal muscle A. is not essential for contraction. B. is longer than the action potential of cardiac muscle. C. has a prolonged plateau phase. D. causes the immediate uptake of calcium ions into the lateral sacs of the sarcoplasmic reticulum. E. spreads inward to all parts of the muscle via the T tubules.
* Cardiac muscle 1. Where are intercalated discs located?What is their function? 2. Describe two more characteristics of cardiac muscle?
Which 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.
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.
19. During Cross Bridge Cycling in Cardiac Muscle Which of The Following is True. A. Troponin pulls on Myosin to generate contractile force. B. The power stroke occurs through interaction of myosin and kinesin. C. Calcium activation of Myosin kinase is required for the cycle to proceed. D. A and C. E. None of the above.
An autorhythmic muscle type containing mononucleated and striated muscle fibers. cardiac muscle smooth muscle skeletal muscle 2. This type of muscle is found in the lining of the stomach as well as the walls of arteries. cardiac muscle skeletal muscle smooth muscle 3. A muscle type that functions to transport substances through hollow viscera (organs). skeletal muscle cardiac muscle smooth muscle 4. Voluntary, striated and multinucleated muscle. skeletal muscle cardiac muscle smooth muscle
11. Electrical impulses in muscle fibers are called 12. Groups of muscle fibers are that are surrounded by a type o connective tissue. 13. The is where a neuron synapses with a muscle fiber. ions: On
6. Explain what how the muscles cell maintains resting membrane potential and explain the two main parts of an action potential. Include type of channels and pumps 7. Describe the events at the neuromuscular....
17. Which of the following properties of the structure of skeletal muscle is not true? A. Comprised of individual cells. B. Have well defined striations. C. Have T-tubules. D. Communicate electrically through gap junction channels (connexins). E. Have well defined sarcomeric structure and extensive sarcoplasmic reticulum.
What is a neuro-muscular junction? Please explain its function.2.- What is a chief muscle? Please give an example.3.- Sartorious muscle: Please explain its principal function.4.- Where is located the primary heart pacemaker? What is its function? What is the normal heart rate for adults?5.- Please name the vessels originated from the aortic arc.6.- What is the Portal vein, and its importance? Please name the vessels that give origin to the Portal Vein.7.- Which structures see deoxygenated blood in the pulmonary circuit?8.- What are the main functions of the capillaries?
23. Which of the following statements about the connective sheath of skeletal muscle is true? a. the endomysium wraps around every single muscle fiber b. the perimysium wraps around groups of muscle fibers c. the epimysium wraps around the whole muscle organ d. all of the above e. none of the above