Biology: The Unity and Diversity of Life (MindTap Course List)
15th Edition
ISBN: 9781337408332
Author: Cecie Starr, Ralph Taggart, Christine Evers, Lisa Starr
Publisher: Cengage Learning
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Chapter 35, Problem 11SQ
Summary Introduction
Introduction: The functioning of the muscles weakens when there is a disturbance in the signaling of the motor neurons. When an action potential reaches the neuromuscular junction, it causes the release of the acetylcholine (ACh).
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Cardiomyocytes differ from skeletal muscle cells in that cardiomyocytes ______.
A
"do not have actin, myosin, or Z-disk "
B
do not have their actin and myosin arranged into sarcomeres and myofibrils
C
cannot have action potentials at a high enough frequency for tetani to occur
D
have fewer mitochondria and are more reliant on anaerobic respiration
E
All of the above are true of heart muscle cells
burst of Calchu
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Which of the following is true concerning the role of Calcium in the contraction of muscle-
cells?
20.
A. skeletal muscle cells require a burst of calcium from the sarcoplasmic reticulum.
B. smooth muscle cells require a burst of calcium from the sarcoplasmic reticulum.
C. cardiac muscle cells require a burst of calcium from the sarcoplasmic reticulum.
D. All of the above are correct.
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response to an ertraceil
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Unlike skeletal muscle cells, cardiac muscle cells________."
A
do not use the sliding filament mechanism of contraction
B
are not striated
C
do not rely on an influx of Ca+2 for contraction to occur
D
do not require neural stimulation to contract
Chapter 35 Solutions
Biology: The Unity and Diversity of Life (MindTap Course List)
Ch. 35 - Prob. 1DAACh. 35 - Prob. 2DAACh. 35 - Prob. 3DAACh. 35 - Prob. 4DAACh. 35 - An endoskeleton consists of _________. a. a fluid...Ch. 35 - Prob. 2SQCh. 35 - Prob. 3SQCh. 35 - A ligament connects ________. a. bones at a joint...Ch. 35 - Prob. 5SQCh. 35 - The ___ attaches to the pelvic girdle. a. radius...
Ch. 35 - The ________ is the basic unit of contraction. a....Ch. 35 - In sarcomeres, phosphate-group transfers from ATP...Ch. 35 - A sarcomere shortens when ________. a. thick...Ch. 35 - Prob. 10SQCh. 35 - Prob. 11SQCh. 35 - A motor unit is _________. a. a muscle and the...Ch. 35 - _______ from a motor neuron excites a muscle...Ch. 35 - The sarcoplasmic reticulum stores and releases...Ch. 35 - Match the words with their defining feature. _____...Ch. 35 - Continued strenuous activity can cause lactate to...Ch. 35 - After death, calcium pumps no longer function and...Ch. 35 - Bully whippets are homozygous for a deletion of...Ch. 35 - Athletes tend to have stronger bones than...
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- Muscle fibers that have a high number of mitochondria, contain largeamounts of myoglobin, and exhibit low rates of ATP hydrolysis arecalled __________ fibers.a. slow-glycolyticb. fast-glycolyticc. intermediated. fast-oxidativee. slow-oxidativearrow_forwardWhat event causes a troponin-tropomyosin complex to regain its original shape in muscle relaxation? a. stimulation of ACh receptors b. diffusion of Na+ back into transverse tubules c. return of Ca2+ into the sarcoplasmic reticulum d. breaking of the bond with tropomyosinarrow_forwardMuscle relaxation occurs when ________. a. calcium ions are actively transported out of the sarcoplasmic reticulum b. calcium ions diffuse out of the sarcoplasmic reticulum c. calcium ions are actively transported into the sarcoplasmic reticulum d. calcium ions diffuse into the sarcoplasmic reticulumarrow_forward
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- Which of the following is true concerning the role of Calcium in the contraction of muscle- cells? 23. A. skeletal muscle cells require an extracellular inward-Calcium-current to stimulate the burst of Calcium from the sarcoplasmic reticulum. B. smooth muscle cells require an extracellular inward-Calcium-current to stimulate the burst of Calcium from the sarcoplasmic reticulum. C. cardiac muscle cells require an extracellular inward-Calcium-current to stimulate the An burst of Calcium from intracellular stored-Calcium-organelles. D. No type of muscle cell requires an extracellular inward-Calcium current for normal contractile-function.arrow_forwardThe muscles of a professional marathon runner are most likely to have ________.a. 80 percent fast-twitch muscle fibers and 20 percent slow-twitch muscle fibersb. 20 percent fast-twitch muscle fibers and 80 percent slow-twitch muscle fibersc. 50 percent fast-twitch muscle fibers and 50 percent slow-twitch muscle fibersd. 40 percent fast-twitch muscle fibers and 60 percent slow-twitch muscle fibersarrow_forwardCompared to fast twitch muscle fibers, slow-twitch fibers _____. A are able to produce much greater force during contractions B "have more myoglobin, more mitochondria, and greater endurance" C "are lighter in color, wider in diameter, and receive less blood flow" D cannot maintain contractions as long because they have fewer mitochondriaarrow_forward
- The muscles of a professional sprinter are most likely to have ________.a. 80 percent fast-twitch muscle fibers and 20 percent slow-twitch muscle fibersb. 20 percent fast-twitch muscle fibers and 80 percent slow-twitch muscle fibersc. 50 percent fast-twitch muscle fibers and 50 percent slow-twitch muscle fibersd. 40 percent fast-twitch muscle fibers and 60 percent slow-twitch muscle fibersarrow_forwardD2arrow_forwardMatch each term with the most suitable description. ___ exocrine gland a. cell in nervous tissue ___ endocrine gland b. secretes a hormone ___ fibroblast c. secretes through a duct ___ melanocyte d. collagen-producing cell ___ neuron e. contracts involuntarily ___ smooth muscle f. pigment-producing cell ___ skeletal muscle g. main source of body heat ___ blood h. main cells in epidermis ___ keratinocyte i. fluid connective tissue ___ extracellular fluid j. includes interstitial fluid, lympharrow_forward
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