BIO 348 - Lecture Exam #2 Questions With
Complete Solutions
4 functional properties of all muscle tissues correct answer: contractility, excitability, extensibility, elasticity
Contractility correct answer: ability to shorten forcibly when stimulated
what is responsible for contractility correct answer: actin and myosin
excitability correct answer: nerve signals or other stimuli excite muscle cells by causing electrical impulses
extensibility correct answer: muscle cells can be stretched or lengthened
when does extensibility occur correct answer: when the opposing muscle is contracting
elasticity correct answer: muscle tissues recoiling passively and resuming resting length
skeletal muscle tissue (microscopic anatomy) correct answer: attaches to skeleton, striated with muscle fibers, voluntary contraction cardiac muscle tissue (microscopic anatomy) correct answer: only occurs in walls of the heart (visceral organ), striated, involuntary contraction
smooth muscle tissue (microscopic anatomy) correct answer: found in the walls of the hollow internal organs(visceral organ), no striations, involuntary contraction
how does skeletal muscle produce movement correct answer: attaches to skeleton and moves by moving bones
how do visceral organs produce movement correct answer: contract and release to move fluid and substances through hollow organs
what kind of muscles open and close body passages, how? correct answer: sphincter muscles, encircle openings, contract to restrict, relax to allow passage
how do skeletal muscles and muscle tone maintain posture and stabilize joints correct answer: contract continuously
how do muscles produce heat correct answer: contraction
what connective tissue surrounds muscles (organ level) correct answer: epimysium
what connective tissue surrounds fascicles correct answer: perimysium what connective tissue surrounds muscle fibers (cell level) correct answer: endomysium
muscles are made up of correct answer: fascicles
fascicles are made up of correct answer: muscle fibers
muscle fibers are made up of correct answer: myofibrils
myofibrils are made up of correct answer: sarcomeres
contractile proteins are correct answer: actin and myosin
sarcomeres are made up of correct answer: actin and myosin filaments
types of myofilaments correct answer: thick and thin
what are thick filaments correct answer: bundled myosin molecules
what are thin filaments correct answer: actin molecules and regulator proteins
what are regulator proteins correct answer: troponin and tropomyosin
epimysium correct answer: connective tissue surrounding entire
muscle perimysium correct answer: Connective tissue surrounding a fascicle
endomysium correct answer: connective tissue surrounding a muscle fiber
in general what are skeletal muscles supplied by correct answer: one nerve, one artery, and one or more veins
how do nerves are vessels supply intramuscular connective tissue correct answer: they branch out through the tissue, with the smallest branches serving individual muscle fibers
contracting muscles have a high demand for ____ and ____ correct answer: nutrients, O2
the basic unit of contraction in skeletal muscle correct answer: sarcomere
troponin correct answer: regulatory protein in thin filaments that spiral around actin molecules
tropomyosin correct answer: regulatory protein that covers myosin-binding sites to prevent actin from binding to myosin
what enzyme do thick filaments contain, and what does it do correct answer: ATPase - splits ATP to release the energy required for muscle contraction
Complete Solutions
4 functional properties of all muscle tissues correct answer: contractility, excitability, extensibility, elasticity
Contractility correct answer: ability to shorten forcibly when stimulated
what is responsible for contractility correct answer: actin and myosin
excitability correct answer: nerve signals or other stimuli excite muscle cells by causing electrical impulses
extensibility correct answer: muscle cells can be stretched or lengthened
when does extensibility occur correct answer: when the opposing muscle is contracting
elasticity correct answer: muscle tissues recoiling passively and resuming resting length
skeletal muscle tissue (microscopic anatomy) correct answer: attaches to skeleton, striated with muscle fibers, voluntary contraction cardiac muscle tissue (microscopic anatomy) correct answer: only occurs in walls of the heart (visceral organ), striated, involuntary contraction
smooth muscle tissue (microscopic anatomy) correct answer: found in the walls of the hollow internal organs(visceral organ), no striations, involuntary contraction
how does skeletal muscle produce movement correct answer: attaches to skeleton and moves by moving bones
how do visceral organs produce movement correct answer: contract and release to move fluid and substances through hollow organs
what kind of muscles open and close body passages, how? correct answer: sphincter muscles, encircle openings, contract to restrict, relax to allow passage
how do skeletal muscles and muscle tone maintain posture and stabilize joints correct answer: contract continuously
how do muscles produce heat correct answer: contraction
what connective tissue surrounds muscles (organ level) correct answer: epimysium
what connective tissue surrounds fascicles correct answer: perimysium what connective tissue surrounds muscle fibers (cell level) correct answer: endomysium
muscles are made up of correct answer: fascicles
fascicles are made up of correct answer: muscle fibers
muscle fibers are made up of correct answer: myofibrils
myofibrils are made up of correct answer: sarcomeres
contractile proteins are correct answer: actin and myosin
sarcomeres are made up of correct answer: actin and myosin filaments
types of myofilaments correct answer: thick and thin
what are thick filaments correct answer: bundled myosin molecules
what are thin filaments correct answer: actin molecules and regulator proteins
what are regulator proteins correct answer: troponin and tropomyosin
epimysium correct answer: connective tissue surrounding entire
muscle perimysium correct answer: Connective tissue surrounding a fascicle
endomysium correct answer: connective tissue surrounding a muscle fiber
in general what are skeletal muscles supplied by correct answer: one nerve, one artery, and one or more veins
how do nerves are vessels supply intramuscular connective tissue correct answer: they branch out through the tissue, with the smallest branches serving individual muscle fibers
contracting muscles have a high demand for ____ and ____ correct answer: nutrients, O2
the basic unit of contraction in skeletal muscle correct answer: sarcomere
troponin correct answer: regulatory protein in thin filaments that spiral around actin molecules
tropomyosin correct answer: regulatory protein that covers myosin-binding sites to prevent actin from binding to myosin
what enzyme do thick filaments contain, and what does it do correct answer: ATPase - splits ATP to release the energy required for muscle contraction
