Unit 2 Milestone-9

HQ7. Determine whether each label describes skeletal or cardiac muscle.

Muscle hypertrophy refers to _______ while muscle atrophy refers to _______.     "an increase in muscle strength and diameter, a decrease in muscle strength and diameter"     "an increase in the number of motor units in a muscle, a decrease in the number of motor units in a muscle"     "the effect of rest on muscle cells, the effect of endurance exercise on muscle cells"     all of the above are correct

Match the relaxation and contraction action of the skeletal muscle with the events mentioned. D D D D Calcium moves out of the sarcoplasm, back into the sarcoplasmic reticulum The membrane of the muscle fiber repolarizes. The membrane of the muscle fiber depolarize. Motor neuron stops releasing its chemical signal Calcium from the sarcoplasmic reticulum into the sarcoplasm. ions are released Action potential arrives at the neuromuscular junction and synaptic vesicles release acetylcholine (ACh) 1. Relaxation 2. Contraction

What contains troponin, is involuntary and intracellular calcium is necessary in muscle contraction? Multi unit smooth muscle  Unitary smooth muscle Cardiac muscle fiber Red skeletal muscle fiber White skeletal muscle fiber   only one option should be correct

Describe the process of skeletal muscle contraction, beginning with an action potential in a motor neuron and ending with the relaxation of the muscle. Your answer should include the following words: neuromuscular junction, T tubule, sarcoplasmic reticulum, calcium, thin filaments, binding sites, thick filaments, sarcomere, Z disc, and active transport.

Muscle spindles :-a- are found in all skeletal musclesb- are found only in large skeletal musclesc- consist of small numbers of extrafusal muscle fibersd- consist of a large number of extrafusal muscle fibers

1. Compare the excitation-contraction coupling in the three types of muscle. Skeletal muscle Smooth muscle Cardiac muscle Sarcomere/myofibril Thick filament Thin filament Striations I tubules Sarcoplasmic reticulum

At right are pictures showing a part①Fully relaxed sarcomere of a muscle fiber of a skeletal muscle cell when it is relaxing and after it has contracted fully. 1. Label the following components: • Actin/thin filament • Myosin/thick filament • Sarcomere Н 2. Skeletal muscle cells are said to be striated, striped. Alternating dark and light stripes can be seen under a light microscope; more detail is shown in the electron micrographs (EMS) at right. Compare the top EM, which shows one dark vertical stripe (taking up about the middle third of the picture) flanked by two white stripes (taking up the rest of the picture). What protein's presence or absence appears to cause the dark and light stripes? ②Fully contracted sarcomere of a muscle fiber Figure: E. Marieb & K. Hoehn, Human Anatomy & Physiology (2016).

The correct order for the smallest to the largest unit of organization in muscle tissue is ________. fascicle, filament, muscle fiber, myofibril filament, myofibril, muscle fiber, fascicle muscle fiber, fascicle, filament, myofibril myofibril, muscle fiber, filament, fascicle

S2

please fill in the blanks: 25. The combination of alternating dark A bands and light _______________ bands gives a muscle fiber its striated appearance 27. neurotransmitters are stored in ______________, which are located within synaptic end bulbs 30. cardiac muscle tissue has a long _____________ that allows time for the chambers of the heart to relax and fill with blood between beats 31. smooth muscle tissue contains thick filaments, thin filaments, and ____________ filaments 34. the minimum stimulus required for skeletal muscle contraction is called a ____________ stimulus

Muscle versus bone Venn diagram Drag each word or phrase to the part of the Venn diagram to which it is associated; if a word or phrase is associated with both muscular and skeletal systems, place it in the overlapping parts of the circles. High use of ATP Bone cells Helps maintain body temperature Contains blood vessels Includes connective tissue Calcium reservoir Produces blood cells Receives signals from nervous system One function is movement Sliding filament model Myofibrils Vertebrate muscular system Vertebrate skeletal system

Once an action potential arrives at the neuromuscular junction, there is a sequence of events that result in muscle contraction. Place these events in the correct numerical sequence. 1 2 3 4 5 [Choose ] [Choose ] [Choose ] [Choose] [Choose ] [Choose ] acetylcholine is released the binding sites for myosin heads are exposed calcium is converted to ATP action potentials travel down t-tubules to the inner regions of muscle fibers calcium is released cross bridges form

In both smooth and skeletal muscle calcium must be actively transported out of the fluid surrounding the actin and myosin filaments in order for relaxation to occur.  True    False   2. When a nerve synapses with ________ it may cause the cell to either contract or to relax.                                 a skeletal muscle cell                                 a smooth muscle cell                                 any type of muscle cell   3. Which type(s) of muscle cells are still able to contract and produce force when they are stretched to double their resting length?                                 skeletal                                 smooth                                 both smooth and skeletal

explain the inner cells of the skeletal muscle to include: myofibrils, sarcolemma, sarcoplasm

Describe the types of skeletal muscle fibers based on: Structural differences (chemical and physical) Contraction speed and resistance to fatigue Type of respiration

consider a muscle cell is changing from relaxtion to contraction  1)

What contains troponin, is involuntary and intracellular calcium is necessary in muscle contraction? Multi-unit smooth muscle Unitary smooth muscle O Cardiac muscle fiber Red skeletal muscle fiber White skeletal muscle fiber

What contains troponin, is involuntary and intracellular calcium is necessary in muscle contraction? Multi unit smooth muscle  Unitary smooth muscle Cardiac muscle fiber Red skeletal muscle fiber White skeletal muscle fiber

Matching: Match the structure to the description. 1. Bundle of muscle fibers2. Connective tissue surrounding a musclefiber3. Connective tissue surrounding a fascicle4. Z line to Z line5. Where thick myofilaments attach a. Perimysium b. Sarcomere c. Endomysiumd. Fasciclee. Tendonf. Myofibrilg. Active site

Name:. Year and Section: F. Muscular Tissues Tissue Type Source EXERCISE NO. 4 Tissue Type Source Tissues skeletal smooth 69 Date Submitted: Group No.:. Tissue Type cardiac Source

Match the statement on the left with the best response on the right. Breaking the high energy bond in ATP Causes troponin/tropomyosin proteins to move and expose the myosin binding sites on actin The place where acetylcholine contributes to muscle contraction [Choose ] [Choose ] causes myosin to perform the power stroke and produce force phosphate causes myosin to let go of actin calcium neuromuscualr junction sarcomere

Please help with the labeling of organization of skeletal muscle: Here's what  I found: fascicle muscle fibers nuclei sarcomere sarcolemma myofibril M line I band A band Z disc H zone Thick filament Thin filament perimysium sarcoplasmic reticulum epimysium

ZAV : ۱۲:۵۲م سبت ۳ نیسان docs.google.com a The functions of tropomyosin in skeletal muscle include sliding on actin to produce shortening releasing Ca2+ after initiation of contraction. binding to myosin during contraction. acting as a "relaxing protein" at rest by covering up the siteswhere myosin binds to actin generating ATP, which it passes to the contractilemechanism. Which of the following is the proper progression of the levels of organization in the body? chemicals, cells, organs, tissues, body systems, whole body chemicals, cells, tissues, organs, body systems, whole body cells, chemicals, tissues, organs, whole body, body systems cells, chemicals, organs, tissues, whole body, body systems O chemicals, cells, tissues, body systems, organs, whole body working as barriers that restricts the movement of protein and other molecules from the underlying connective tissue into the epithelium Basement membrane Epithelial tissue Dermis Microvilli Back Next Never submit passwords…

IV. Sequence of Events: Muscle Contraction See if you can place the events that occur during muscle contraction and relaxation in their proper order. Insert numbers in the spaces 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 calciun. 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 bind with the cell wall and 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 sarcolemma. G. Calcium ions are pumped back into the sarcoplasmic reticulum. H. The myosin heads…

consider a muscle is changing from relaxtion to contraction  1)Draw a diagram or flow chart of the muscle contraction cycle. You can drawpictures or write descriptions of each step. Indicate where Calcium and ATP arerequired for the cycle to continue.

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

please answer 6 7 8

During muscle contraction, what does calcium bind to in skeletal muscles? O Tropomyosin Actin Myosin Troponin DHP-Ryanodine receptors 1

Describe the major events that occur when a muscle fiber contracts. Include all chemicals, structures and processes at a microscopic level starting at the neuromuscular junction and ending with the relaxation of the muscle fiber