188. A 3-year-old boy is brought to the physician because of a 6-month history of a sway back when standing. His brother had a history of muscle weakness and died of pneumonia at the age of 12 years. Physical examination shows hip girdle weakness. His serum creatine kinase concentration is markedly increased. This patient's symptoms are most likely caused by the accumulation of a defective protein in which of the following locations in muscle cells? A) Cytoplasm B) Lysosome C) Mitochondria D) Nuclear membrane E) Peroxisome F) Smooth endoplasmic reticulum h
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- 57. The type of muscle that contains neural varicosities delivering neurotransmitters to a large group of muscle cells instead of to just one cell is the ______________________muscle. -cardiac -smooth -skeletal -smooth, cardio and skeletalMehran has heard from some of his teammates on the football team that taking creatine as a supplement during training will improve his muscle mass. He decides to test this hypothesis through an experimental study. What would be the best control group for this study?42- One of the following sentences is incorrect: a- Stretching Golgi tendon leads to a relaxation to the muscle. Hee b- Knee jerk reflex causes contraction of the antagonist muscle c- the spindle muscle is a sensory organ. d- alpha motor neuron acts to inhibit the antagonist muscle in knee jerk reflex.
- Cardiac and skeletal muscle are both “striated” types of muscle and yet they have very distinct functional characteristics. a) Skeletal muscle functions as discrete motor units and the cardiac muscle works as a functional syncytium. Define the italicized terms in the previous sentence, explain their importance, and describe the cellular features that underlie these functional differences. b) Cardiac muscle exhibits automaticity, while excitation of skeletal muscle is neurogenic. Define the italicized terms and provide a brief explanation of mechanisms underlying each.Please answer both questions 1) Which of the following components of skeletal muscle tissue is absent from smooth muscle tissue? a) sarcoplasmic reticulum b) t-tubules c) myofibrils d) regulatory proteins 2) Cell-to-cell communication is possible in smooth muscle tissue due to the absence of: a) troponin. b) sarcomeres. c) endomysium. d) striations.31) Provide one difference and one similarity in the process of contraction of smooth, skeletal, and cardiac muscle. These could include channels, mechanisms, anatomic features etc (SHORT ANSWER PLEASE)
- Skeletal muscle fibres are very metabolically active and are adapted to create a lot of ATP from aerobic cellular respiration. Additionally, cells require other things to stay alive. Explain how the following three organ systems contribute to allowing a muscle cell to carry out its roles: a) Respiratory system b) Cardiovascular system c) Gastrointestinal system asap please.Why is the proportion of actin within filaments in cells smaller than would be predicted by in vitro experiments?15) what role does calcium play in muscle contraction? a) calcium is not involved in skeletal muscle contraction b) it binds to tropomyosin and moves Tripp in away from the myosin binding sit on the actin molecules c) it's binds to Troponin and moves tropomyosin away from the actin binding sit on the myosin molecules d) it binds to troponin and moves tropomyosin away from the myosin binding site on the actin mole