Biology
5th Edition
ISBN: 9781260487947
Author: BROOKER
Publisher: MCG
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Chapter 27.2, Problem 1CC
Structure and Movement
Concept Check: Does the filament move more like the arms of a human swimmer or the shaft of a boat propeller?
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Muscle contraction experiment
What will happen to the muscle if ATP and salt was added simultaneously?
Move
Making Connections, Student Laboratory Packet, page 5
A2. How Does Fatigue Affect Muscle Performance?
A condition known as muscle fatigue occurs when certain waste products of muscle cell activity build
up in the cells. Until these waste chemicals are removed, the fatigue will continue.
Do the Following Activity
Hold a spring-type clothespin between your thumb and index finger. Pinch the ends together
completely (until the two ends touch) and release them. Do this as rapidly as possible for one minute.
Record the number of times you could squeeze the clothespin in one minute:
Try the activity again, doing it the same way and using the same
two fingers as before.
Record the number of times you could squeeze the clothespin
the second time:
Answer the Following Questions
Some people are able to squeeze the clothespin more times in a minute than others. Suggest a possible
explanation for this.
Could you do as many in a minute the second time as you could do the first time?
Provide a…
VISUAL SKILLS What will happen in a muscle cell thathas used up its supply of oxygen and ATP? (ReviewFigures 9.18 and 9.20.)
Chapter 27 Solutions
Biology
Ch. 27.2 - Core Skill: Connections Look ahead to Section...Ch. 27.2 - Prob. 2CSCh. 27.2 - Structure and Movement Concept Check: Does the...Ch. 27.2 - Prob. 3CSCh. 27.3 - Prob. 1CCCh. 27.5 - Prob. 1EQCh. 27.5 - Prob. 2EQCh. 27 - Which of the following features is common to...Ch. 27 - The bacterial phylum whose members typically...Ch. 27 - Gram-staining is a procedure that microbiologists...
Ch. 27 - Place the following steps in the correct order,...Ch. 27 - What ecological role do cyanobacteria play? a....Ch. 27 - Prob. 6TYCh. 27 - Prob. 7TYCh. 27 - Prob. 8TYCh. 27 - Prob. 9TYCh. 27 - Prob. 10TYCh. 27 - Prob. 1CQCh. 27 - Prob. 2CQCh. 27 - Prob. 3CQCh. 27 - Prob. 1COQCh. 27 - Prob. 2COQ
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- BIO168 Human Anatomy & Physiology I Practice Worksheet B Sequence of muscle contraction Number the following statements in their proper sequence to describe the contraction mechanism in a skeletal muscle cell. _____ A. Acetylcholine is released into the neuromuscular junction by the axonal terminal. _____ B. The action potential, carried deep into the cell, causes the sarcoplasmic reticulum to release calcium ions. ____ C. The muscle cell relaxes and lengthens. _____ D. Acetylcholine diffuses across the neuromuscular junction and binds to receptors on the sarcolemma. ____ E. The calcium ion concentration at the myofilaments increases; the myofilaments slide past one another, and the cell shortens. _____ F. Depolarization occurs, and the action potential is generated. _____ G. As calcium is actively reabsorbed into the sarcoplasmic reticulum, its concentration at the myofilaments decreases.arrow_forwardModule 5 Concept Check 10. Name the set of structures inside the dotted lines in the figure below. Next, identify the process that occurs in this location. THREE C D E F G H bio INCH I J B • Na EB Attached to G: +11. Name the structures in the image. Letter A B G 100 E 69 WWW € Calv Cafe F Name of Structure Action Potential 11-1 E Oarrow_forwardVISUAL SKILLS Describe how the two functional domains of the MyoDprotein relate to the two polypeptide subunitsarrow_forward
- Human Anatomy & Physiology I (BIO168) Sequence of Events for Muscle Contraction Practice Worksheet See if you can place the events that occur during muscle contraction and relaxation in their proper order. Insert numbers in the paces provided to order the events in the proper sequence. _____ A. An electrical impulse travels over the sarcolemma and inward along the T-tubules, causing sacs in the sarcoplasmic reticulum to release calcium. ____ B. The release of ACh stops and acetylcholinesterase breaks down any remaining ACh. _____ C. Troponin and tropomyosin prevent the myosin heads from grasping the thin filament, and the muscle fiber relaxes. _____ D. An electrical impulse causes small vesicles at the end of a motor neuron to release the neurotransmitter acetylcholine (ACh). _____ E. Calcium binds with the troponin on the actin filament, exposing attachment points. _____ F. ACh diffuses across the synaptic cleft, where it stimulates receptors in the…arrow_forwardEvaluate and Synthesize 9. INTERPRET DATA Examine Figure 40-13. Based on the summation of two stimuli shown in that graph, draw a curve showing summation when the muscle fiber is stimulated three times. Figure 40-13 Summation and tetanusarrow_forwardWork 6. Comparison of physiological properties of different types of muscles. TABLE 4. SKELETAL MUSCLES SMOOTH MUSCLES RESTING POTENTIAL (LEVEL, IN MV) DURATION OF ACTION POTENTIAL CALCIUM-BINDING PROTEINS DURATION OF THE CYCLE CONTRACTION-RELAXATION AYTOMATICITY NTERCELLULAR CONTACTS SENSITIVITY TO BIOLOGICALLY ACTIVE SUBSTANCESarrow_forward
- Vhat are the two types of muscle movement categories? Give an example for both. Describe Swammerdam's experiment and Galvani's experiment with frog legs. What did they tell us about muscle contraction? What is the sliding-filament model for muscle contraction? Describe the role of actin and myosin of sarcomeres in the model (be specific). Describe how an action potential triggers muscle contraction. Know the specific molecules involved. . Describe the structural and functional differences between smooth, cardiac and skeletal muscles. What are the three types of skeletal muscle fibers and how do they differ in structure and function? Next « Previous MacBook Proarrow_forwardL PHYSIOLOGY - Spring20 fall20 Repetitive stimulation of a skeletal muscle fiber will cause an increase in contractile strength because repetitive stimulation causes an increase in Select one: O a. The velocity of muscle contraction on O b. The number of muscle myofibrils generating tension O c. Concentration of calcium in the myoplasm O d. The duration of cross-bridge cycling Next pagearrow_forwardBiomechanically, what is the significance and importance of momentum when performing a squat?arrow_forward
- Work 4. Schemes of myocardial sarcomere and organization of fine sarcomere filaments. Indicate in the picture: 1. Membrane of muscle fibers. 2. Z-disk. 3. T-system. 4. Sarcoplasmic reticulum. 5. Actin filaments 6. Myosin filaments. Img. 9. Scheme of sarcomere structure of myofibrils of muscle fibers of skeletal muscle. The thick threads are formed by the contractile protein Thin threads are formed by contractile protein Control proteins troponin and tropomyosin are associated with thick or thin threads? Calcium binding control protein is: Img. 10. Scheme of the structure of the actin threads. Indicate in the picture: 1. Actin globules. The energy of ATP in the cycle of contraction-relaxation of 2. Troponin. skeletal muscle is being spent on: 3. Tropomyosin.arrow_forwardMULTIPLE ANSWER QUESTIONS. Select all that apply. Which of the following occurs when the muscle is excited (contracting)? The myosin binding site on the actin thin filaments are covered Ca2+ ion are being released from the sarcoplasmic reticulum into the sarcoplasm Zone of overlap of a sprcomere increases The H-zone of a sarcomere gets larger O The myosin head is NOT attached to the actin thin filament - Previous Nextarrow_forwardAnatomy and Physiology question. Please help! You likely noticed that subjects could not maintain their maximum grip strength for very longbut could maintain just above 50% grip strength for quite some time. In terms of muscle unitrecruitment and fatigue, explain why this is possiblearrow_forward
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