Homework Answers
Option 1st is the correct answer. Excitation--contraction coupling is the process by which the action potential responsible for muscle contraction triggers the release of calcium stored in the sarcoplasmic reticulum into the sarcoplasm (cytosol of muscle cell) and initiate the muscle contraction by the shortening of sarcomere.
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Titan Myosin Act Question 2 2 pts Which of the following occurs during the excitation contraction...
Question 28 4 pts Once the action potential occurs in the sarcolemma, it spreads moving down...
Question 28 4 pts Once the action potential occurs in the sarcolemma, it spreads moving down the T-tubules. What next? What is the correct order of events which result in skeletal muscle contraction? (4 points) a. Once the muscle cell action potential is initiated then calcium ions are released from the sarcoplasmic reticulum. These calcium ions bind to troponin. With this binding, tropomyosin is pulled away from the active sites on actin. Myosin can bind with actin forming a cross...
Which of the following statements about skeletal muscle contraction is false? During muscle contraction, the Z...
Which of the following statements about skeletal muscle contraction is false? During muscle contraction, the Z discs move closer together as the myosin heads move toward the plus ends of the actin filaments. The changes in voltage across the plasma membrane that occur when a muscle cell receives a signal from the nervous system causes Ca2+ to flow into the sarcoplasmic reticulum, triggering a muscle contraction. An action potential in the muscle cell plasma membrane leads to voltage-gated calcium channels...
Question 50 1 pts What happens during a tetanic contraction in skeletal muscle? Twitches sum together,...
Question 50 1 pts What happens during a tetanic contraction in skeletal muscle? Twitches sum together, creating a strong contraction Action potentials sum together, leading to a strong contraction The muscle is stretched and reflexively contracts strongly Ca2+ influxes in SR, which leads to a strong contraction Question 49 1 pts In smooth muscle, phosphorylation of leads to contraction. Dihydropyradine Receptor Tropomyosin Myosin light chain Calmodulin O Troponin
1.During skeletal muscle contraction, the following occurs except A)ATP hydrolysis directly causes the movement of the...
1.During skeletal muscle contraction, the following occurs except A)ATP hydrolysis directly causes the movement of the myosin head to cause a power stroke B)When the myosin head releases a phosphate, it can bind actin C)When a new ATP binds to a myosin head, it releases actin D)ATP hydrolysis activates the myosin head so it can bind actin E)When the myosin head binding actin releases ADP, it moves to create the power stroke 2.During skeletal muscle contraction, the length of the...
Multiple choice questions-Tor tes scantron questios s In a sarcomere, cross-bridge formation occurs specifically in the...
Multiple choice questions-Tor tes scantron questios s In a sarcomere, cross-bridge formation occurs specifically in the 5. Skeletal muscle fibers are formed from embryonic cells calledwhich fuse together, making skeletal muscle cells multinucleated. 1. a. sarcomeres b. myofibrils c. myoblasts d. fascicles a. Z line. b. I band c. M line. d. H band e. zone of overlap. 6. Titin is a(n) a. elastic protein. b. thin filament protein. 2. A thin layer of connective tissue that surounds a muscle...
NAME SID 25. Usted below are different steps that occur during the excitation and contraction of...
NAME SID 25. Usted below are different steps that occur during the excitation and contraction of a muscle fiber. Please select the correct sequence in which these stages occur. 1) Ca2+ binds to Tropomyosin, causing a conformational change that unblocks cross-bridge binding sites. 2) The Sarcoplasmic Reticulum is depolarized, which opens up Voltage-Gated Channels that release Ca2+ into the cytoplasm. 3) The Action Potential then travels along the cell membrane and down transverse tubules that extend into the muscle fiber....
2. Complete the following statements concerning smooth muscle characteristics by inserting the correct terms in the...
2. Complete the following statements concerning smooth muscle characteristics by inserting the correct terms in the answer blanks. Endomysium 1. Whereas skeletal muscle exhibits elaborate connective tissue coverings, smooth muscle has a scant connective tissue_(1) smooth muscle 2. which is secreted by the_(2)_cells. The most common variety of smooth muscle, called_(3) smooth muscle, is arranged in unitary 3. opposing layers in the walls of hollow organs. Most often, there are (4)_ such layers, one running_(5)__and the other running (6) 4....
2:34 87) Which of the below make up the pectoral girdle? Al clavicles only B) clavicles...
2:34 87) Which of the below make up the pectoral girdle? Al clavicles only B) clavicles and scapulae C) clavicles, scapulae, and humerus D) clavicles, scapulae, humerus, radius, and ulna clavicle, scapula, humerus, radius, ulna, and carpal bones 88) The scapula articulates with the humerus at its A) infraspinous B) scapular D) supraspinous E) elenoid cavity C) olecranon 89) Skeletal muscle contraction begins when calcium ions bind to A) energized cross-bridges B) myosin C actin. D) tropomyosin. E) troponin 90)...
Question 21 2 pts While watching TV last night, the detectives referred to a victim as...
Question 21 2 pts While watching TV last night, the detectives referred to a victim as a stiff. The medical examiner corrected the detective and stated that the proper description is rigor mortis. How does this process occur in the human body? Tissues harden due to a lack of circulation. Blood coagulates in the body causing stiffness. Without ATP, muscles remain fixed in their last state of contraction. With a lack of nerve signals, the body tenses. 10:54 il LTE...
Question 46 Not yet answered Points out of 1 P Flag question The structural and functional...
Question 46 Not yet answered Points out of 1 P Flag question The structural and functional unit of skeletal muscle is the Select one: O a. Sarcolemma O b. Actin myofilament O c. Sarcomere O d. Myosin myofilament Question 34 Not yet answered Points out of 1 P Flag question Which one of the following proteins is present in the thin filament? Select one: O a. Myosin O b. Titin O c. Actin Dronione nome Net Which one of the...
Which of the following statements about skeletal muscle contraction is false? During muscle contraction, the Z discs move closer together as the myosin heads move toward the plus ends of the actin filaments. The changes in voltage across the plasma membrane that occur when a muscle cell receives a signal from the nervous system causes Ca2+ to flow into the sarcoplasmic reticulum, triggering a muscle contraction. An action potential in the muscle cell plasma membrane leads to voltage-gated calcium channels...
Question 50 1 pts What happens during a tetanic contraction in skeletal muscle? Twitches sum together, creating a strong contraction Action potentials sum together, leading to a strong contraction The muscle is stretched and reflexively contracts strongly Ca2+ influxes in SR, which leads to a strong contraction Question 49 1 pts In smooth muscle, phosphorylation of leads to contraction. Dihydropyradine Receptor Tropomyosin Myosin light chain Calmodulin O Troponin
Multiple choice questions-Tor tes scantron questios s In a sarcomere, cross-bridge formation occurs specifically in the 5. Skeletal muscle fibers are formed from embryonic cells calledwhich fuse together, making skeletal muscle cells multinucleated. 1. a. sarcomeres b. myofibrils c. myoblasts d. fascicles a. Z line. b. I band c. M line. d. H band e. zone of overlap. 6. Titin is a(n) a. elastic protein. b. thin filament protein. 2. A thin layer of connective tissue that surounds a muscle...
NAME SID 25. Usted below are different steps that occur during the excitation and contraction of a muscle fiber. Please select the correct sequence in which these stages occur. 1) Ca2+ binds to Tropomyosin, causing a conformational change that unblocks cross-bridge binding sites. 2) The Sarcoplasmic Reticulum is depolarized, which opens up Voltage-Gated Channels that release Ca2+ into the cytoplasm. 3) The Action Potential then travels along the cell membrane and down transverse tubules that extend into the muscle fiber....
2. Complete the following statements concerning smooth muscle characteristics by inserting the correct terms in the answer blanks. Endomysium 1. Whereas skeletal muscle exhibits elaborate connective tissue coverings, smooth muscle has a scant connective tissue_(1) smooth muscle 2. which is secreted by the_(2)_cells. The most common variety of smooth muscle, called_(3) smooth muscle, is arranged in unitary 3. opposing layers in the walls of hollow organs. Most often, there are (4)_ such layers, one running_(5)__and the other running (6) 4....
2:34 87) Which of the below make up the pectoral girdle? Al clavicles only B) clavicles and scapulae C) clavicles, scapulae, and humerus D) clavicles, scapulae, humerus, radius, and ulna clavicle, scapula, humerus, radius, ulna, and carpal bones 88) The scapula articulates with the humerus at its A) infraspinous B) scapular D) supraspinous E) elenoid cavity C) olecranon 89) Skeletal muscle contraction begins when calcium ions bind to A) energized cross-bridges B) myosin C actin. D) tropomyosin. E) troponin 90)...
Question 21 2 pts While watching TV last night, the detectives referred to a victim as a stiff. The medical examiner corrected the detective and stated that the proper description is rigor mortis. How does this process occur in the human body? Tissues harden due to a lack of circulation. Blood coagulates in the body causing stiffness. Without ATP, muscles remain fixed in their last state of contraction. With a lack of nerve signals, the body tenses. 10:54 il LTE...
Question 46 Not yet answered Points out of 1 P Flag question The structural and functional unit of skeletal muscle is the Select one: O a. Sarcolemma O b. Actin myofilament O c. Sarcomere O d. Myosin myofilament Question 34 Not yet answered Points out of 1 P Flag question Which one of the following proteins is present in the thin filament? Select one: O a. Myosin O b. Titin O c. Actin Dronione nome Net Which one of the...
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