Antigarvity muscles maintain stretch reflex for prolonged periods withoutfatigue, because :-a- they are heavily innervated by α -motor neuronsb- they obtain their energy needs mainly from anaerobic metabolic processesc- they contain exceptionally high levels of creatine phosphated- they are rich in mitochondria

Antigarvity muscles maintain stretch reflex for prolonged periods withoutfatigue, because :-a- they are heavily innervated by α -motor neuronsb- they obtain their energy needs mainly from anaerobic metabolic processesc- they contain exceptionally high levels of creatine phosphated- they are rich in mitochondria

Human Physiology: From Cells to Systems (MindTap Course List)

9th Edition

ISBN:9781285866932

Author:Lauralee Sherwood

Publisher:Lauralee Sherwood

Chapter8: Muscle Physiology

Section: Chapter Questions

Problem 2TAHL

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What happens to contraction of a muscle cell if some of the Ca2+ that was released during a contraction is still in the cytoplasm (sarcoplasm) when the next stimulus arrives? - The muscle contracts with the same tension generated as during the first contraction, because the number of cross-bridges formed is always the same during a contraction. - The muscle contracts with greater tension generated because more troponin molecules bound means greater myosin-binding sites (active sites) are revealed on the actin, leading to a larger number of cross-bridges formed. - The muscle contracts with greater tension generated because there will be more Ca2+ in the sarcoplasm after the second stimulation, which will bind to more troponin molecules. - The muscle contracts with the same tension generated as during the first contraction, because muscles contract in an all-or-none fashion.
Muscle contraction involves a protein conformational change called the power stroke. Where ultimately does the energy come from that allows a series of conformational changes involved in the power stroke? O Ca2+ O ATP hydrolysis O Actin polymerization O GTP hydrolysis
Shortly after a person dies, Ca2+diffuses out of the saroplasmic reticulum and the body becomes very still and rigid, a phenomenoncalled rigor mortis (rig′er mōr′tis). Given ATP’s role in myosin head movement, propose an explanation for rigor mortis.
The discharge from Golgi tendon organs initiated by excessive stretch ofa skeletal muscle produces :-a- inhibition of α -motor neurons of antagonistic musclesb- inhibition of γ-motor neurons of antagonistic musclesc- inhibition of α -motor neurons of the same muscled- stimulation of γ-motor neurons of the same muscle
This thick filament motor protein composed of 6 polypeptide chains uses ATP hydrolysis to interact creating a powerstroke for skeletal muscle contractions. A Myosin B Actin C Titin D Tropomyosin
The human body has mainly two types of muscle fibres: slow-twitch and fast-twitch. The { slow or fast} twitch contract slowly and resist fatigue and produce most of their energy through { aerobic or anaerobis} rispiration. These muscle fibres are best used for activities like { weight lifting and playing tennis or biking and jogging} The { slow or fast} twitch are adapted for the rapid regeneration of power. They can best be used in activities such as { weight lifting and playing tennis or biking and jogging}. They are rich in glycogen and depend on { aerobic or anaerobis} rispiration. to produce energy. This leaves them vulnerable to the accumulation of lactate and they fatigue quickly. which one are those? the answers
Which of the following commits a cell to become muscle cell? O the glucocorticoid receptor O MyoD O Ey O Muts O HDAC (histone deacetylase)
Myofibis in muscle fibres are made up of repeating units of dark and light bonds called
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)
When a skeletal muscle is suddenly stretched :-a- it relaxes suddenlyb- it develops a static stretch reflexc- it develops a dynamic stretch reflexd- it develops clonic contractions
Which of the following statements about smooth muscle is correct: Select one: O a. Endothelial secretion of NO results in relaxation of blood vessel wall smooth muscle O b. Its activity is not affected by nervous system c. In smooth muscle cells myosin is deactivated by myosin light chain kinase O d. Its contraction is weaker than the contraction of skeletal muscle
Skeletal muscles would be expected to contain large numbers of ————— because of their high energy demands 1. Lysosomes 2.cilia 3. Mitochondria 4. Chloroplasts