answer both to get a like.or don't attempt plz.Thanks When might unrelated individuals engage in apparently altruistic acts?O If they have the same phenotype.O If they are unselfish individuals.O If the altruism is likely to be reciprocated.O If the act benefits their species or population.O Unrelated individuals never perform apparently altruistic acts.Question 57Which of the following is the last step in the muscle stroke cycle?O Calcium ions bind to the protein troponinO Myosin heads form cross-bridges with actin filamentsO Depolarization of the T tubulesO Displacement of tropomyosin, exposing myosin-binding sites on actinO ATP hydrolysis, the myosin head unbinds the cross-bridge

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Description: answer both to get a like.or don't attempt plz.Thanks When might unrelated individuals engage in apparently altruistic acts?O If they have the same phenotype.O If they are unselfish individuals.O If the altruism is likely to be reciprocated.O If the

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Biology

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BIOLOGY:CONCEPTS+APPL.(LOOSELEAF)

10th Edition

ISBN:9781305967359

Author:STARR

Publisher:STARR

Chapter32: Structural Support And Movement

Section: Chapter Questions

Problem 2CT: After death, a person no longer makes ATP, so calcium stored in the sarcoplasmic reticulum diffuses...

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You can choose one or more than one option About human skeletal muscle contraction, what are the correct statements? PHYSIOLOGY basi:. 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 tubules are plasma membrane imaginations of the sarcolemma that allow excitation-contraction coupling Arginase is an enzyme that : BIOCHEMISTRY advanced is expressed in the cytoplasm of hepatocytes shows two isoenzymes in mammals. found in the liver and other tissues catalyzes the formation of urea and ornithine from arginine. induces hyperammonemia when it is overexpressed is inhibited by basic amino acids such as lysine and ornithine.…
The sliding filament model depicts how myosin motors attached to actin lead to muscle contraction. This process proceeds in a precise series of events. Indicate which of the following shows the correct order of steps in the sliding filament model. Group of answer choices Myosin binds ATP; myosin tightly binds actin; power stroke; myosin releases actin Myosin binds GTP; myosin releases actin; power stroke; myosin tightly binds actin Actin binds ATP; power stroke; myosin tightly binds actin; actin releases ADP Actin binds ADP; myosin releases actin; power stroke; actin releases ADP
OEE QUESTION 39 In a contractile unit of muscle, "thin" filaments are composed of O A. calcium. O B. actin. OC myosin. OD lactic acid. QUESTION 40 Which ofE the following ir acorroct nnir?
Muscle contraction can occur when: is it 1,2,3,4? A bands lengthen. myosin filaments shorten. sarcomeres shorten. I bands remain unchanged
96. An investigator is studying the contraction and relaxation of vascular smooth muscle in an experimental animal model. Which of the following describes the most likely order of events during this process? 0000000 200602 H) Myosin Light Chain Phosphorylation 1 2 2 3 3 4 4 Binding of Calcium to Calmodulin 3 1 4 2 4 2 3 Myosin Light Chain Dephosphorylation 2 3 4 3 4 2 1 2 Calcium Entry Into the Cell 4 2 3 1 1 1 3 1
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…
Which of the following are true regarding processes that are involved in the Relaxation Period of a muscle twitch? (choose all that apply) O This is the fırst phase where the "cross-bridge" occurs O ATP binds to the Myosin head to release it from Actin n Calcium is removed from sarcoplasm and returned to sarcoplasmic reticulum O This is the phase that begins the depolarization of the sarcolemma O Acetylcholinesterase helps to remove Acetylcholine from the synapse
Which of the following summarizes the role of acetylcholinesterase in muscle contraction? O opens the receptor site for cross bridge activity O increases acetylcholine so muscle contractions will increase O degrades acetylcholine so muscle contraction will stop O neurotransmitter that initiates the motor impulse for a contraction to occur
Select ALL that could cause muscle cramping (a sustained muscle contraction) in skeletal muscle: OHyperexcitability of somatic motor neurons (secreting too much Ach) Botulism poisoning, which prevents Ach secretion from somatic motor neurons O Myasthenia Gravis, in which antibodies block Ach receptors at the motor end plate, preventing Ach from binding O Hypocalcemia, in which the calcium pumps of the sarcoplasmic reticulum are unable to keep Ca2+ inside the SR (allowing Ca2+ to leak into the cytoplasm)
Part 1 of 1- Question 1 of 1 During the actin-myosin ATP cycle, if there is no action potential on the muscle cell but lots of ATP available, which of the following statements will be true? • O A. Myosin will be attached to actin but there will be no ATP attached to the myosin head O B. ATP will have been split into ADP and Pi but a crossbridge will not have formed yet OC. The power stroke will have occurred, but no ATP can attach to the myosin head D. The crossbridge between the myosin head and actin will not break
Calcium initiates smooth muscle contraction by leading to the phosphorylation of calcium channels leading to the phosphorylation of myosin • activating myosin light chain phosphatase removing tropomyosin from actin
A study of muscle fibers between chimpanzees and humans revealed that although muscle mass per body size are approximately equivalent, the ratio of red (slow) and white (fast) fibers were significantly different. Chimps tend to have a ratio of 30% red to 70% white where humans are 60/40 respectively. Speculate about what this ratio difference means in terms of muscle activity potential and a possible evolutionary significance of this difference.