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Questions and Answers
Which type of muscle tissue is found in the heart wall?
Which type of muscle tissue is found in the heart wall?
- Smooth muscle
- Skeletal muscle
- Cardiac muscle (correct)
- Connective tissue
What type of muscle tissue is responsible for pushing things through organs?
What type of muscle tissue is responsible for pushing things through organs?
- Skeletal muscle
- Cardiac muscle
- Adipose tissue
- Smooth muscle (correct)
Which type of muscle tissue is voluntary and attached to bones for movement?
Which type of muscle tissue is voluntary and attached to bones for movement?
- Smooth muscle
- Cardiac muscle
- Skeletal muscle (correct)
- Nervous tissue
What is the size of skeletal muscle fibers?
What is the size of skeletal muscle fibers?
What are the striations in skeletal muscle fibers made of?
What are the striations in skeletal muscle fibers made of?
Why are skeletal muscle fibers multinucleate?
Why are skeletal muscle fibers multinucleate?
How do myoblasts become multinucleate in skeletal muscle development?
How do myoblasts become multinucleate in skeletal muscle development?
What is the role of myosatellite cells in muscle injury?
What is the role of myosatellite cells in muscle injury?
What is the function of myosatellite cells that did not fuse in development?
What is the function of myosatellite cells that did not fuse in development?
What is the function of perimysium in skeletal muscle organization?
What is the function of perimysium in skeletal muscle organization?
Where do the collagen fibers of epimysium, perimysium, and endomysium converge at the end of a muscle?
Where do the collagen fibers of epimysium, perimysium, and endomysium converge at the end of a muscle?
What is the role of endomysium in skeletal muscle organization?
What is the role of endomysium in skeletal muscle organization?
Where do arterioles supply blood in the skeletal muscle organization?
Where do arterioles supply blood in the skeletal muscle organization?
What is the pathway of nerve fibers in skeletal muscle organization?
What is the pathway of nerve fibers in skeletal muscle organization?
Where do blood vessels and nerves enter in skeletal muscle organization?
Where do blood vessels and nerves enter in skeletal muscle organization?
What is the function of titin in muscle tissue?
What is the function of titin in muscle tissue?
Where are mitochondria located in muscle tissue?
Where are mitochondria located in muscle tissue?
What happens when myofibrils contract in muscle tissue?
What happens when myofibrils contract in muscle tissue?
What is the function of T tubules in muscle cells?
What is the function of T tubules in muscle cells?
What is the structure formed by the combination of 2 terminal cisternae and 1 T tubule?
What is the structure formed by the combination of 2 terminal cisternae and 1 T tubule?
What is the role of the sarcoplasmic reticulum (SR) in muscle cells?
What is the role of the sarcoplasmic reticulum (SR) in muscle cells?
What structural feature of sarcomeres is directly responsible for muscle contractions?
What structural feature of sarcomeres is directly responsible for muscle contractions?
What is the primary component of the A band in a sarcomere?
What is the primary component of the A band in a sarcomere?
Where is the H Band located within the sarcomere?
Where is the H Band located within the sarcomere?
What is the role of the Z line in the structure of a sarcomere?
What is the role of the Z line in the structure of a sarcomere?
Which region of the sarcomere contains only thin filaments and extends from one A band to the next?
Which region of the sarcomere contains only thin filaments and extends from one A band to the next?
What is the significance of the M Line in the sarcomere?
What is the significance of the M Line in the sarcomere?
Which feature contributes to the striated appearance of muscle cells?
Which feature contributes to the striated appearance of muscle cells?
What happens to the I Band during muscle contraction?
What happens to the I Band during muscle contraction?
What protein covers the active sites on G-actin, preventing actin-myosin interaction at rest?
What protein covers the active sites on G-actin, preventing actin-myosin interaction at rest?
What protein binds to one G-actin, holding the troponin-tropomyosin complex in position?
What protein binds to one G-actin, holding the troponin-tropomyosin complex in position?
What protein has a receptor that binds 2 calcium ions to initiate a contraction?
What protein has a receptor that binds 2 calcium ions to initiate a contraction?
Which protein forms a long strand holding F-actin together and extends along the F-actin strand between G-actin molecules?
Which protein forms a long strand holding F-actin together and extends along the F-actin strand between G-actin molecules?
What molecule has active sites where myosin (in thick filament) can bind for contractions?
What molecule has active sites where myosin (in thick filament) can bind for contractions?
What is the primary function of titin in muscle tissue?
What is the primary function of titin in muscle tissue?
What happens to the titin strands during muscle contraction?
What happens to the titin strands during muscle contraction?
During muscle contraction, what is the primary role of the myosin heads?
During muscle contraction, what is the primary role of the myosin heads?
What is the function of the core of titin within the thick filament?
What is the function of the core of titin within the thick filament?
What is the function of titin in muscle tissue?
What is the function of titin in muscle tissue?
Where does titin extend within the sarcomere in muscle tissue?
Where does titin extend within the sarcomere in muscle tissue?
What happens to the myosin heads during muscle contraction?
What happens to the myosin heads during muscle contraction?
What is the primary function of the core of titin within the thick filament?
What is the primary function of the core of titin within the thick filament?
What remains unchanged in width during muscle contraction according to the Sliding Filament Theory?
What remains unchanged in width during muscle contraction according to the Sliding Filament Theory?
What prevents myosin from binding to actin in a relaxed muscle?
What prevents myosin from binding to actin in a relaxed muscle?
During muscle contraction, the shortening of which structure leads to the muscle fiber shortening?
During muscle contraction, the shortening of which structure leads to the muscle fiber shortening?
Which bands narrow as the thin filaments slide toward the center of the sarcomere during muscle contraction?
Which bands narrow as the thin filaments slide toward the center of the sarcomere during muscle contraction?
What is held in place by troponin in a relaxed muscle?
What is held in place by troponin in a relaxed muscle?
During a muscle contraction, which band remains constant in width according to the Sliding Filament Theory?
During a muscle contraction, which band remains constant in width according to the Sliding Filament Theory?
What happens to the I bands during muscle contraction?
What happens to the I bands during muscle contraction?
What changes occur to the H bands and I bands during muscle contraction?
What changes occur to the H bands and I bands during muscle contraction?
What happens to the Z lines during muscle contraction?
What happens to the Z lines during muscle contraction?
What occurs to the zones of overlap between thin and thick filaments during muscle contraction?
What occurs to the zones of overlap between thin and thick filaments during muscle contraction?
What is the primary function of the sodium-potassium pump in the maintenance of resting membrane potential?
What is the primary function of the sodium-potassium pump in the maintenance of resting membrane potential?
What accounts for approximately 93% of ion movement across the cell membrane under resting conditions?
What accounts for approximately 93% of ion movement across the cell membrane under resting conditions?
What type of potentials are responsible for long-distance signals in excitable membranes?
What type of potentials are responsible for long-distance signals in excitable membranes?
What happens if the continuous leakage of Na+ and K+ across the membrane is allowed?
What happens if the continuous leakage of Na+ and K+ across the membrane is allowed?
What is the significance of an excitable cell?
What is the significance of an excitable cell?
Which type of cells generally use only small changes in membrane potential to initiate their responses?
Which type of cells generally use only small changes in membrane potential to initiate their responses?
What is the term for the period where no other action potential can be generated in the cell?
What is the term for the period where no other action potential can be generated in the cell?
Which type of muscle tissue generally uses propagating action potentials to initiate their responses?
Which type of muscle tissue generally uses propagating action potentials to initiate their responses?
What is the term for the period where another action potential can be generated, but a large stimulus is needed?
What is the term for the period where another action potential can be generated, but a large stimulus is needed?
Which cells are characterized by having a high number of voltage-gated ion channels?
Which cells are characterized by having a high number of voltage-gated ion channels?
What is the term for the period where no other action potential can be generated in a cell?
What is the term for the period where no other action potential can be generated in a cell?
Which type of cells generally use only small changes in membrane potential to initiate their responses?
Which type of cells generally use only small changes in membrane potential to initiate their responses?
What type of cells are characterized by having a high number of voltage-gated ion channels and using propagating action potentials to initiate their responses?
What type of cells are characterized by having a high number of voltage-gated ion channels and using propagating action potentials to initiate their responses?
What is the term for the membrane potential moving from a positive value to -70mV?
What is the term for the membrane potential moving from a positive value to -70mV?
Which type of cells have few voltage-gated ion channels and generally use only small changes in membrane potential to initiate their responses?
Which type of cells have few voltage-gated ion channels and generally use only small changes in membrane potential to initiate their responses?
What is the primary function of the Sodium-Potassium pump in the context of the Resting Membrane Potential?
What is the primary function of the Sodium-Potassium pump in the context of the Resting Membrane Potential?
What accounts for approximately 93% of ion movement across the cell membrane under resting conditions?
What accounts for approximately 93% of ion movement across the cell membrane under resting conditions?
What is the primary role of transient changes in resting membrane potential in excitable cells?
What is the primary role of transient changes in resting membrane potential in excitable cells?
What is the primary function of the all-or-none law in the context of action potentials?
What is the primary function of the all-or-none law in the context of action potentials?
What is the significance of the unequal charge distribution in excitable cells?
What is the significance of the unequal charge distribution in excitable cells?
What is the term for the period when the cell rapidly repolarizes and K+ gates open?
What is the term for the period when the cell rapidly repolarizes and K+ gates open?
What causes hyperpolarization of the membrane during the action potential process?
What causes hyperpolarization of the membrane during the action potential process?
What occurs once the peak of action potential is reached?
What occurs once the peak of action potential is reached?
What happens to the membrane potential during depolarization?
What happens to the membrane potential during depolarization?
What occurs when the membrane potential moves from a negative value to a positive peak of +30mV?
What occurs when the membrane potential moves from a negative value to a positive peak of +30mV?
What happens after the peak of the action potential when the cell rapidly repolarizes?
What happens after the peak of the action potential when the cell rapidly repolarizes?
What causes the hyperpolarization of the membrane in the neuron?
What causes the hyperpolarization of the membrane in the neuron?
What prevents further depolarization once the hyperpolarization occurs?
What prevents further depolarization once the hyperpolarization occurs?
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