Post-lab for lab #4

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…

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 Pro

Muscle contraction experiment What will happen to the muscle in the experiment?

Muscle contraction experiment What will happen to the muscle if ATP and salt was added simultaneously?

Work 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 SUBSTANCES

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Biology Question: True or False? Action potential is an electrical signal traveling along the membrane of the muscle cell as a non-graded depolarization.

No plagiarism How do the movements promoted by smooth or cardiac muscle? Explain.   Explain the sliding filament theory of contraction.

MULTIPLE 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 Next

what is happening here in muscle contraction.  Be sure to tell me what role Ca+, ATP, myosin, and actin playwhat is happening here in muscle contraction.  Be sure to tell me what role Ca+, ATP, myosin, and actin play

multiple choice

Reflect back on the Muscle Fatigue investigation we did earlier in this Activity. Choose one of your classmate’s interpretation to one of these questions: What happened to your energy & ability to pinch the clothespin as you progressed through each trial? Why?  What might cause one to be able to get more squeezes, in other words, to have less fatigue? Explain in terms of biological concepts. Suggest how the amount of ATP produced cause your muscle cells to be less efficient. When did this change in the amount of ATP produced occur in this investigation? How could you tell? Your muscles would probably recover enough after 10 minutes to operate at the original efficiency. Explain why.  Show how specific details from the steps of cellular respiration add details to answer this question.

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.

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…

Q2\ The process of muscle contraction occurs over a number of key step. What are these steps? Explain with details. *

Define the all-or-none principle. The same student remarked that at 180 mV stimulus, it is expected that 100 g mass is lifted by the muscle fibre. Do you agree or disagree? Why or why not?

Place the appropriate reactant, catalyst, and product into the blanks provided to accurately portray ATP sources for muscle contraction. Labels Drop Zones Reset All Myokinase ATP Creatine kinase Creatine ADP + Pi Creatine phoshate + ADP ADP Glucose Glucose + O2 Image Description IT ATP + ATP CO2 + H2O + Lactic acid + ATP + Pi ATP

Compare and contrast the major biochemical and mechanical properties of the three primary types of muscle fibers found in human skeletal muscle.

We move a lot and do not even realize how intricate these movements may be from gross motor to fine motor manipulations. Briefly explain the steps involved in a single muscle contraction beginning at the neuromuscular junction through one complete contraction and relaxation for the sliding filament theory. Don’t forget to include all the major proteins (actin, myosin, troponin and tropomyosin) involved as well as calcium and ATP.

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Skeletal muscle is described as striated. What are the lighter, thinner stripes noted under the  microscope?  Group of answer choices troponin actin myosin dystrophin   Rather than innervating individual muscle fibers, motor neurons often innervate two or more muscle fibers. The motor neuron and the muscle fibers it innervates are together called a:  Group of answer choices motor unit myofibril muscle fascicle motor fascia   Fast glycolytic muscle fibers allow for relatively quick ATP energy production by splitting glucose (but eventually leads to fatigue), a process described as:  Group of answer choices fermentation aerobic pathway anaerobic pathway ATP reserve use

Anatomy 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 possible

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Part B - Electrical and Chemical Events of Muscle Contraction Match the type of articulation with the best description of either its functionality or arrangement of tissue. > View Available Hint(s) Reset Help Motor unit Also known as an 1Cimpulse, 1D a(n) is an electrical signal that is produced on Neurotransmitters excitable membrane such as muscle and nerve tissue. All-or-none principle are chemicals released at the synaptic terminal of a neuron that can transmit an Muscle fatigue Sm impulse to a muscle fiber. Action potential A muscle fiber is either contracted or it's not. This is the Recruitment A runner competing in the 50-yard dash has muscles in the legs that are undergoing Complete tetanus is described as àll the muscle fibers controlled by the same motor neuron. is the process by which a muscle produces more force to pick up a brick verses a feather. You are at the finish line of the Boston Marathon and see a runner fall a few yards from the finish line. This runner is…

The role of tropomyosin in a muscle cell is to ____. all to cell to relax by blocking the binding sites on actin facilitate the formation of cross-bridges between actin and myosin Interactions between thick and thin filaments during muscle contraction occur in which sequence? "attach to actin, detach from actin, pivot in powerstroke, return or recock" "attach to actin, pivot in powerstroke, detach from actin, return or recock" "attach to actin, pivot in powerstroke, return or recock, detach from actin" "detach from actin,pivot in powerstroke, attach to actin, return or recock" What is the role of calcium pump in muscle contractions? pump calcium out of the sarcoplasmic reticulum against its concentration gradient to initiate contractions remove calcium from the fluid surrounding the myofibrils to end contractions pump calcium into the muscle cell to stimulate the release of acetylcholine

3.4. About human skeletal muscle contraction, what are the correct statements? PHYSIOLOGY_basic (OJO) A muscle fiber is made by the parallel apposition of sarcomers. Generation of force relies on the formation of cross-bridges between actin and myosin filaments. In the process of contraction, adenosine triphosphate (ATP) is required both to drive the actin-myosin association-dissociation cycle and to recycle calcium back to the endoplasmic reticulum. Each muscle fiber is innervated by one neuron only. T tubules are plasma membrane invaginations of the sarcolemma that allow excitation-contraction coupling.

Experimenters can separate F-actin thin myofilaments frommyosin thick myofilaments. First they homogenize musclecells in a blender (to break cell membranes); then they place thehomogenate in a Ca2+-free “relaxing solution” that contains ATP.Explain why ATP must be present and Ca2+ ions must not bepresent in order to isolate thick and thin myofilaments from eachother.

physiology question

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Using the biceps brachii as an example, describe the biochemical and mechanochemical series of events that enables motor neurons to trigger muscle contraction.   Thank you!