BSC 2085 EXAM 3 Question and Answer A+
Verified 100% Correct Questions and Answers
• What are the 3 types of muscle tissue? -✓✓Skeletal, Cardiac, Smooth
• Which type of muscle tissue is voluntary? -✓✓Skeletal muscle
• Which muscle tissues are striated? -✓✓Skeletal and Cardiac muscle
• What microscopic structures give skeletal muscle its striated appearance? -
✓✓Myofibrils
• Define epimysium. -✓✓Connective tissue surrounding the entire muscle
• Define perimysium. -✓✓Connective tissue surrounding bundles of muscle fibers
• Define endomysium. -✓✓Connective tissue surrounding individual muscle fibers
• What connective tissue structure typically connects muscle to bone? -✓✓Tendons
• Define myofibril. -✓✓A long, threadlike structure composed of myofilaments
• Define myofilament. -✓✓Contractile proteins within myofibrils
• Define sarcolemma. -✓✓The cell membrane of a muscle fiber
• Define sarcoplasm. -✓✓The cytoplasm of a muscle fiber
• Define sarcoplasmic reticulum. -✓✓The specialized endoplasmic reticulum in
muscle cells
• Define sarcomere. -✓✓The basic contractile unit of muscle fibers
• What protein primarily makes up thick myofilaments? -✓✓Myosin
• What protein primarily makes up thin myofilaments? -✓✓Actin
, • Describe the sliding filament model of contraction. -✓✓Myosin heads pull actin
filaments closer together, shortening the sarcomere
• Do myofilaments change length during contraction? -✓✓No, they stay the same
length
• What is the primary function of the sarcoplasmic reticulum in skeletal muscle? -
✓✓To store and release calcium ions
• T-tubules are extensions of what in skeletal muscle fibers? -✓✓Sarcolemma
• What structures make up a 'triad' in muscle contraction? -✓✓T-tubule and two
terminal cisternae
• What type of neurons innervate skeletal muscle? -✓✓Somatic motor neurons
• What type of neurons innervate smooth muscle? -✓✓Autonomic motor neurons
• What does a motor neuron release to stimulate a skeletal muscle fiber? -
✓✓Acetylcholine
• What is calcium's function during muscle contraction? -✓✓To bind to troponin,
allowing myosin to attach to actin
• What is the role of acetylcholinesterase in muscle cell contraction? -✓✓To break
down acetylcholine in the synaptic cleft
• What happens if a muscle fiber is treated with an acetylcholinesterase inhibitor? -
✓✓Prolonged contraction due to increased acetylcholine
• For a muscle fiber to relax after contraction, calcium ions must be actively
pumped back into what? -✓✓Sarcoplasmic reticulum
• Define the term motor unit. -✓✓A motor neuron and all the muscle fibers it
innervates
• How many muscle fibers are innervated by a single motor neuron controlling eye
movement? -✓✓Few
Verified 100% Correct Questions and Answers
• What are the 3 types of muscle tissue? -✓✓Skeletal, Cardiac, Smooth
• Which type of muscle tissue is voluntary? -✓✓Skeletal muscle
• Which muscle tissues are striated? -✓✓Skeletal and Cardiac muscle
• What microscopic structures give skeletal muscle its striated appearance? -
✓✓Myofibrils
• Define epimysium. -✓✓Connective tissue surrounding the entire muscle
• Define perimysium. -✓✓Connective tissue surrounding bundles of muscle fibers
• Define endomysium. -✓✓Connective tissue surrounding individual muscle fibers
• What connective tissue structure typically connects muscle to bone? -✓✓Tendons
• Define myofibril. -✓✓A long, threadlike structure composed of myofilaments
• Define myofilament. -✓✓Contractile proteins within myofibrils
• Define sarcolemma. -✓✓The cell membrane of a muscle fiber
• Define sarcoplasm. -✓✓The cytoplasm of a muscle fiber
• Define sarcoplasmic reticulum. -✓✓The specialized endoplasmic reticulum in
muscle cells
• Define sarcomere. -✓✓The basic contractile unit of muscle fibers
• What protein primarily makes up thick myofilaments? -✓✓Myosin
• What protein primarily makes up thin myofilaments? -✓✓Actin
, • Describe the sliding filament model of contraction. -✓✓Myosin heads pull actin
filaments closer together, shortening the sarcomere
• Do myofilaments change length during contraction? -✓✓No, they stay the same
length
• What is the primary function of the sarcoplasmic reticulum in skeletal muscle? -
✓✓To store and release calcium ions
• T-tubules are extensions of what in skeletal muscle fibers? -✓✓Sarcolemma
• What structures make up a 'triad' in muscle contraction? -✓✓T-tubule and two
terminal cisternae
• What type of neurons innervate skeletal muscle? -✓✓Somatic motor neurons
• What type of neurons innervate smooth muscle? -✓✓Autonomic motor neurons
• What does a motor neuron release to stimulate a skeletal muscle fiber? -
✓✓Acetylcholine
• What is calcium's function during muscle contraction? -✓✓To bind to troponin,
allowing myosin to attach to actin
• What is the role of acetylcholinesterase in muscle cell contraction? -✓✓To break
down acetylcholine in the synaptic cleft
• What happens if a muscle fiber is treated with an acetylcholinesterase inhibitor? -
✓✓Prolonged contraction due to increased acetylcholine
• For a muscle fiber to relax after contraction, calcium ions must be actively
pumped back into what? -✓✓Sarcoplasmic reticulum
• Define the term motor unit. -✓✓A motor neuron and all the muscle fibers it
innervates
• How many muscle fibers are innervated by a single motor neuron controlling eye
movement? -✓✓Few
