Muscular SystemOnline version muscular system quiz by Mollie Owen 1 The thick filament is composed of what moledule? a actin b troponin c myosin d tropomyosin 2 The pivoting head of the myosin provides what is known as the a power stroke b recruitment c ATP d energy 3 What molecule in the thin filament has a binding site for myosin heads? a tropomyosin b troponin c myosin d actin 4 What molecule in the thin filament covers the binding site? a tropomyosin b troponin c myosin d actin 5 What molecule in the thin filament has a binding site for calcium ions? a tropomyosin b troponin c myosin d actin 6 What molecule must bind to the myosin head in order for it to disconnect with actin? a ATP b calcium ions c thin filament d sarcomere 7 Hydrolysis of ATP returns the myosin molecule to the ______ conformation. a backsliding b high energy c relaxed d latent 8 As the contraction cycle continues, alternate binding of myosin heads prevents the tin filament from a backsliding b high energy c relaxed d latent 9 What is NOT a role of ATP in the contraction of muscle? a detach myosin from actin b operate the calcium pump c powers glycolosis d power the working stroke 10 Which of the following shorten during contraction? (may be more than one) Choose one or more answers a thick filament b sarcomere c thin filament d H zone 11 What is a neuron that extends from the brain or spinal cord to a muscle or gland? a sensory neuron b motor neuron c interneuron d none of the above 12 What is a motor neuron and all the muscle fibers it innervates referred to as? a motor unit b skeletal muscles c myofibril d thin filament 13 The stimulation of additional motor units will increase the strength of the contraction. This process is called a contraction b twitch c recruitment d resorption 14 The development of tension in a muscle, in response to a single action potential, is called a/an a contraction b stimulus c sarcomere d twitch 15 The phase of a muscle twitch where sarcomeres shorten and increase in tension a contraction period b latent period c relaxation period d power stroke period 16 The phase of a muscle twitch where sarcomeres return to resting length and decrease in tension a contraction period b latent period c relaxation period d power stroke period 17 The phase of a muscle twitch where sarcomeres are at resting length and action potential propogates a contraction period b latent period c relaxation period d power stroke period 18 ______ results from repeated stimulation of a muscle fiber. a propogation b glycolysis c wave summation d twitch 19 In wave summation, you must _____ the time interval between stimuli. a increase b decrease c eliminate 20 When stimulus frequency is increased, but some relaxation still occurs this is called a unfused tetanus b fused tetanus c wave summation d contraction 21 Once stored ATP has been used, an immediate source of energy is a glycolosis b ATPase c glucose d creatine phosphate 22 One molecule of CP produces _______ ATP. a one b two c many d no 23 ___ is the process that breaks down glucose. a contraction b resorption c power stroke d glycolosis 24 What are two products of the breakdown of glucose? Choose one or more answers a glycolosis b ATP c pyruvate d creatine phosphate 25 If oxygen is not available, pyruvate is converted to a lactic acid b glucose c ATP d myofibril 26 If oxygen is available, the process is known as ________ catabolism. a unfused tetanus b fused tetanus c anaerobic d aerobic 27 What are two sources of oxygen? Choose one or more answers a myoglobin b blood c oxidative d respiratory cells 28 What structure attaches muscles to bones? a ligaments b tendons c thick filaments d skeletal tissue 29 The whole muscles is composed of muscle cells (fibers) grouped in bundles called a myoglobin b perimysium c epimysium d fascicles 30 What connective tissue surrounds the whole muscle? a endomysium b epimysium c perimysium d fascicles 31 What connective tissue surrounds the fascicles? a endomysium b epimysium c perimysium d muscles 32 What connective tissue surrounds the muscle cell? a endomysium b epimysium c perimysium d fascicles 33 What is the plasma membrane of a cell? a sarcolemma b sarcoplasm c sarcoplasmic reticulum 34 What is the endoplasmic reticulum of a cell? a sarcolemma b sarcoplasm c sarcoplasmic reticulum 35 What is the intracellular fluid around organelles? a sarcolemma b sarcoplasm c sarcoplasmic reticulum 36 What is part of the sarcoplasmic reticulum and stores calcium ions? a T tubules b terminal cisternae c triad 37 What is part of the sarcolemma and carries action potential? a T tubules b terminal cisternae c triad 38 What is the T tubule plus two terminal cisternae? a T tubules b terminal cisternae c triad 39 Which of the following are true of the dark band? Choose one or more answers a known as A band b known as I band c contains only thin filaments d contains both thick and thin filaments e defined by length of thick filament f defined as distance between two thick filaments 40 Which of the following are true of the light band? Choose one or more answers a known as A band b known as I band c contains only thin filaments d contains both thick and thin filaments e defined by length of thick filament f defined as distance between two thick filaments 41 What bisects the I band and anchors the thin filaments? a Sarcomere b H zone c A band d Z-discs 42 What is the region between two Z-discs that is the functional unit of the skeletal muscle called? a Sarcomere b H zone c A band d Z-discs 43 What is the cylindrical organelle inside the muscle cells? a fascicle b myofilament c myofibril d muscle fiber (cell) e muscle 44 Thousands of these bundled together compose a myrofibril a fascicle b myofilament c myofibril d muscle fiber (cell) e muscle 45 Thin cylinders that are much longer than most cells a fascicle b myofilament c myofibril d muscle fiber (cell) e muscle 46 Made up of muscle fibers or cells a fascicle b myofilament c myofibril d muscle fiber (cell) e muscle 47 Made up of fascicles a fascicle b myofilament c myofibril d muscle fiber (cell) e muscle 48 The synapses between a motor neuron and the muscle it innervates is called a/an a neuromuscular junction b axon c myofibril d sarcolemma 49 Synaptic vesicles in the axon terminal of a motor neuron contain what neurotransmitter a ATP b creatine phosphate c acetylcholine 50 Binding a neurotransmitter to the receptors on the motor end plate opens what type of ion channels? a calcium channels b sodium channels c axon channels d ATP channels 51 Opening of the sodium channels leads to _____ of the motor end plate. a contraction b recruitment c hydrolosis d depolarization 52 As a result of depolarization, an action potential is propagated along the _______ of the muscle cell and down the _____ into the cell. a Z discs; terminal cisternae b dark band; fascicle c sarcolemma; T tubules 53 Propagating action potential releases what ion from the terminal cisternae? a potassium ions b calcium ions c sodium ions d ATP 54 How is a neurotransmitter removed from the synaptic cleft? a acetylcholinesterase b ATP c calcium ions d choline phosphate 55 What type of muscle tissue is striated and under voluntary control? a smooth b skeletal c cardiac 56 Muscle tissue has all of the following characteristics except a secretion b contractility c excitability 57 Which of the following connective tissue layers surrounds a fascicle? a endomysium b epimysium c perimysium 58 What is the functional unit of skeletal muscle? a sarcomere b myofiliment c sarcoplasm 59 What structure in skeletal muscle stores calcium? a mitochondria b sarcoplasmic reticulum c T-tubules 60 What type of ion channel opens at the neuromuscular junction which leads to the release of acetylcholine? a voltage-gated Na channels b voltage-gated Ca++ channels c ligand-gated Ca++ channels 61 What prevents Ach in the synaptic cleft from continuing to stimulate contraction? a calcium returning to the terminal cisternae b Ach gets used up c acetylcholineserate destroys Ach 62 When _____ gated ion channels at the motor end plate open, the interior of the cell becomes less negative, which is known as _____. a ligand; depolarization b ligand; repolarization c voltage; depolarization 63 What ion exits the muscle cell returning the cell to its resting membrane potential? a sodium b potassium c calcium 64 Excitation-contraction coupling requires: a calcium only b calcium and ATP c ATP only 65 During muscle contraction which two filaments form cross bridges? a actin and myosin b troponin and tropomyosin c myosin and troponin 66 What ion binds to regulatory sites on troponin to remove contraction inhibition? a sodium b potassium c calcium 67 What protein blocks myosin binding sites on actin molecules preventing contraction? a troponin b tropomyosin c actin 68 A motor neuron and all the muscle fibers it innervates is called a a motor unit b sarcomere c functional unit 69 Wave summation produces a smooth, continuous contractions b increase muscle tension c prevent fatigue 70 During an isometric contraction, the muscle a shortens b lengthens c does not change length 71 Which fiber type depends on oxygen delivery and aerobic metabolism? a type I fibers b type II fibers 72 What molecule is stored in muscle and provides energy that can be transferred to ADP and resynthesize ATP? a glucose b creatine phosphate c pyruvic acid 73 Which of the following statements about myofilaments is false? a Both thick and thin filaments contain the contractile protein myosin. b Thin filaments of skeletal muscle contain the regulatory proteins troponin and tropomyosin. c Thick filaments contain the contractile protein myosin. 74 The tension in our muscles at rest, which helps to maintain posture and stabilize joints, is called a treppe b recruitment c muscle tone d there is no tension in muscles at rest
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