Mcq physiology

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فاينل 2021 مهمات

اهمشي تقرا وماتترك ابد ونهائياً 🔥الكوزات المنشورات فوك 🔥اسئلة المد 🔥15 سؤال النشرتهن اذا تريد تطور نفسك على افكار حلوه اقرة الباقي وطور نفسك بيهن راح يفهمن الك المادة اكثر مو قصة يجي منهن بس يطور فكرتك اكثر عن المادة ومن يجيك سؤال حتكون عندك معلومة شاملة عن المادة

هذني مهمات وركز عليهن كلش كلش هواي وبل اخص ركز على Sympathetic راح اجي اوضحهن الك بصورة واضحة …………………………………………….. ‼️‼️بل نسبة لل parasympathetic عندي الريسبتر في (ganglia )و (post يلي بعد ganglia )هو ثابت لثنينهم (Ach ) ……………………………………………… بينما من يجي على Sympathatic هنا السالفة بيها اختلاف وراح اوضحة الك بصورة واضحة جميع Ganglia الريسبتر البيها Ach متفقين عليها بس الاختلاف راح يصير وين ؟ راح يصير ب post هنا المشكلة تعال اوضحها الك ‼️اذا جان ال ganglia قريبه من عضو حيكون الريسبتر مالت post ء( Ach) الثاني اذا جانت ganglia بعيده عن العضو بي عدا خيارات اذا جان Post Sympathetic Adrenergic حيكون الرسيبتر (NE) اذا جان Post Sympathetic Cholinergic حيكون الريسبتر Ach اذا جان Post Sympathetic Dopaminergic حيكون الريسبتر هو الدوبامين (D) والمايعرف الرموز مكتوبات ب صوره جوا كل رموز ✅

1. What is the typical resting membrane potential of skeletal muscle fibers? a) -20 millivolts b) -50 millivolts c) -80 to -90 millivolts d) -110 millivolts Answer: c) -80 to -90 millivolts 2. How does the duration of an action potential in skeletal muscle compare to large myelinated nerves? a) It is shorter b) It is approximately the same c) It is five times longer d) It varies depending on the type of muscle fiber Answer: c) It is five times longer 3. What is the velocity of conduction for muscle action potentials in skeletal muscle? a) 1 meter per second b) 5 meters per second c) 10 meters per second d) 3 to 5 meters per second Answer: d) 3 to 5 meters per second 4. Which of the following statements is true regarding the resting membrane potential of skeletal muscle fibers? a) It is significantly higher than in large myelinated nerve fibers b) It is significantly lower than in large myelinated nerve fibers c) It is approximately the same as in large myelinated nerve fibers d) It varies depending on the muscle fiber type Answer: c) It is approximately the same as in large myelinated nerve fibers 5. The duration and velocity of muscle action potentials are optimized for which of the following functions? a) Rapid signal transmission b) Efficient muscle contraction c) Protection against fatigue d) Maintenance of muscle tone Answer: b) Efficient muscle contraction

1. What is the role of transverse tubules (T tubules) in muscle contraction? a) They store calcium ions for muscle contraction. b) They generate action potentials in the muscle fiber. c) They facilitate the spread of action potentials into the interior of the muscle fiber. d) They contract and generate force during muscle contraction. Answer: c) They facilitate the spread of action potentials into the interior of the muscle fiber. 2. What is the purpose of the triad formation in muscle fibers? a) It provides structural support to the muscle fiber. b) It generates ATP for muscle contraction. c) It enables the release of calcium ions from the sarcoplasmic reticulum. d) It generates action potentials in the T tubules. Answer: c) It enables the release of calcium ions from the sarcoplasmic reticulum. 3. How does the release of calcium ions contribute to muscle contraction? a) Calcium ions bind to actin filaments and initiate muscle contraction. b) Calcium ions generate action potentials in the muscle fiber. c) Calcium ions remove acetylcholine from the neuromuscular junction. d) Calcium ions open voltage-gated sodium channels. Answer: a) Calcium ions bind to actin filaments and initiate muscle contraction. 4. What is the process called when the action potential triggers the release of calcium ions and subsequent muscle contraction? a) Muscle relaxation b) Excitation-contraction coupling c) Tetanus d) Muscle fatigue Answer: b) Excitation-contraction coupling 5. Which structure is responsible for the rapid spread of the action potential from the sarcolemma to the interior of the muscle fiber? a) Myofibrils b) Sarcolemma c) Mitochondria d) Transverse tubules Answer: d) Transverse tubules

1. What is the main difference between action potentials with plateaus and typical spike potentials? a) Duration b) Repolarization speed c) Contraction strength d) Onset mechanism Answer: b) Repolarization speed 2. How long can the repolarization phase be delayed in action potentials with plateaus? a) Several milliseconds b) Several seconds c) Several minutes d) Several hours Answer: b) Several seconds 3. What is the importance of the plateau phase in smooth muscle action potentials? a) It accounts for rapid repolarization. b) It triggers the onset of contraction. c) It delays repolarization, leading to prolonged contraction. d) It enhances the strength of contraction. Answer: c) It delays repolarization, leading to prolonged contraction. 4. Which types of smooth muscle are known to exhibit prolonged contraction due to action potentials with plateaus? a) Skeletal muscle b) Cardiac muscle c) Vascular smooth muscle d) Smooth muscle in the intestines Answer: c) Vascular smooth muscle 5. In addition to smooth muscle, where else are action potentials with plateaus observed? a) Skeletal muscle fibers b) Nerve fibers c) Cardiac muscle fibers d) Glandular cells Answer: c) Cardiac muscle fibers

1. What is the role of acetylcholine in skeletal muscle contraction? a) It stimulates muscle fiber growth b) It promotes muscle relaxation c) It initiates muscle contraction d) It provides structural support to muscle fibers Answer: c) It initiates muscle contraction 2. Where is the neuromuscular junction located? a) Near the middle of the muscle fiber b) At the ends of the muscle fiber c) Within the muscle cell nucleus d) In the connective tissue surrounding the muscle Answer: a) Near the middle of the muscle fiber 3. What is the function of motor neurons in skeletal muscle contraction? a) They provide blood supply to the muscle fibers b) They generate electrical impulses for muscle contraction c) They transmit sensory information from the muscle to the brain d) They innervate muscle fibers and control their contraction Answer: d) They innervate muscle fibers and control their contraction 4. Which of the following is true about the organization of skeletal muscle fibers? a) Each muscle fiber is composed of multiple nuclei b) Muscle fibers are arranged in bundles called fascicles c) Muscle fibers range from 10 to 80 micrometers in diameter d) Each muscle fiber extends only a portion of the muscle length Answer: b) Muscle fibers are arranged in bundles called fascicles 5. How many nerve endings typically innervate a single muscle fiber? a) One b) Two c) Multiple d) None Answer: a) One