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6- Musculoskeletal System (3 Hours & 16 minutes)

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[vdo id=’3493d07b4538475fae4f68410ce9f3a0′]

 

   Content of this Session
    • Organization of a Muscle Cell
    • Types of skeletal muscle fibers
    • Muscle proprioceptors
    • Sarcomere (Skeletal and Cardiac Muscle)
    • The neuron action potential
    • Absolute Refractory Period (Functional Refractory Period)
    • Factors Determining the Velocity of the Action Potential
    • The Neuromuscular Junction
    • Excitatory Postsynaptic Potentials (EPSP)
    • Inhibitory Postsynaptic Potentials (IPSP)
    • Skeletal and Cardiac Muscle
    • Smooth Muscle
    • Excitation contraction coupling (Skeletal Muscle)

 

 

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[h] Musculoskeletal System Flashcards

[i] Master this session in just 5 minutes.

[q] Lack of T-tubules in some myofibrils would lead to …..?

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[f]IFVuY29vcmRpbmF0ZWQgY29udHJhY3Rpb24gb2YgaW5kaXZpZHVhbCBmaWJlcnMu

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[Qq]

[q] Which type of muscle fibers perform actions requiring slow sustained force, has a low Atpase activity, use aerobic metabolism, have high content of myoglobin, mitochondrial concentrations and extensive capillaries?

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[f]IFR5cGUgMSAoU2xvdyByZWQgbXVzY2xlKS4gVGhlIHBhcmFzcGluYWwgbXVzY2xlcyBhcmUgcG9zdHVyYWwgbXVzY2xlcyBwcmVkb21pbmFudGx5IGNvbXBvc2VkIG9mIFR5cGUgSSBmaWJlcnMu[Qq]

[q] Which type of muscle fibers perform actions requiring rapid forceful pulses of movement, has a high Atpase activity, use anerobic metabolism, have low content of myoglobin, mitochondrial concentrations and capillaries?

[c]IFNob3cgbWUgdG hlIGFuc3dlcg==[Qq]

[f]IFR5cGUgSUkgKEZhc3Qgd2hpdGUgbXVzY2xlKS4=[Qq]

[q] Which type of Muscle proprioceptors that prevent overstretch of the muscles + Facilitates muscle agonist contraction and antagonist relaxation to prevent overstretching?

[c]IFNob3cgbWUgdG hlIGFuc3dlcg==[Qq]

[f]IE11c2NsZSBzcGluZGxlLg==

Cg==

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[q] Which type of Muscle proprioceptors that prevent overtension on the muscle + when you carry heavy weight that cause high tension on the muscle –> inhibit contraction of the muscle, causing sudden muscle relaxation?

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[f]IEdvbGdpIHRlbmRvbiBvcmdhbi4=

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[Qq]

[q] During contraction, the actin filaments slide over the myosin filaments toward the M line, decreasing the size of the …… bands but ….. band will be the same length?

[c]IFNob3cgbWUgdG hlIGFuc3dlcg==[Qq]

[f]IERlY3JlYXNpbmcgdGhlIHNpemUgb2YgdGhlIEkgYW5kIEggYmFuZHMgKEEgYmFuZCBpcyBBbHdheXMgdGhlIHNhbWUgbGVuZ3RoKS4=

Cg==

[Qq]

[q] Name the following letters:

[c]IFNob3cgbWUgdG hlIGFuc3dlcg==[Qq]

[f]

Cg==

QS4gWiBsaW5lLg==

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Qi4gQSBiYW5kLg==

[Qq]

C. M line.

D. Area of overlap.

E. I band.

F. H band.

[q] The resting membrane potential of neurons is maintained by …..?

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[f]IEhpZ2ggcmVzdGluZyBtZW1icmFuZSBwZXJtZWFiaWxpdHkgdG8gSyBhbmQgbG93IHBlcm1lYWJpbGl0eSB0byBOYS4=

Cg==

[Qq]

[q] Depolarization in neuronal action potential occurs due to ……?

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[f]IE9wZW5pbmcgb2Ygdm9sdGFnZS1nYXRlZCBOYSBjaGFubmVscyB3aXRoIHJhcGlkIGluZmx1eCBvZiBOYSBpbnRvIHRoZSBjZWxsLg==[Qq]

[q] Repolarization in neuronal action potential occurs due to ……?

[c]IFNob3cgbWUgdG hlIGFuc3dlcg==[Qq]

[f]IEsgZWZmbHV4IGlzIHJlc3BvbnNpYmxlIGZvciByZXR1cm5pbmcgdGhlIG1lbWJyYW5lIHBvdGVudGlhbCBiYWNrIHRvIHRoZSByZXN0aW5nIHBvdGVudGlhbC4=

Cg==

[Qq]

[q] Hyperpolarization in neuronal action potential occurs due to ……?

[c]IFNob3cgbWUgdG hlIGFuc3dlcg==[Qq]

[f]IE9jY3VycyBiZWNhdXNlIHRoZSB2b2x0YWdlLWdhdGVkIEsgY2hhbm5lbHMgcmVtYWluIG9wZW4gZm9yIGEgc2hvcnQgdGltZSBhZnRlciByZXBvbGFyaXphdGlvbiBpcyBjb21wbGV0ZWQgKHNsb3cgY2hhbm5lbCkuIA==[Qq]

[q] Drugs that lengthens the action potential (drugs that decreases the conductance of K channels) will (prolong, shorten) the absolute refractory period?

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[f]IFByb2xvbmcu

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[Qq]

[q] Demyelinating neuropathies are caused by damage to the myelin sheath. Loss of insulation results in ….. nerve conduction velocity?

Axonal neuropathies are caused by damage to the nerve axon. Loss of axon fibers results in ….. signal amplitude?

[c]IFNob3cgbWUgdG hlIGFuc3dlcg==[Qq]

[f]IERlbGF5ZWQuIFJlZHVjZWQu

Cg==

[Qq]

[q] In myasthenia gravis, muscle cells can’t depolarize because of ….?

[c]IFNob3cgbWUgdG hlIGFuc3dlcg==[Qq]

[f]IEF1dG9hbnRpYm9kaWVzIGFnYWluc3QgcG9zdHN5bmFwdGljIG5pY290aW5pYyBhY2V0eWxjaG9saW5lIHJlY2VwdG9ycyAmIzgyMTE7Jmd0OyBkZWNyZWFzZWQgbnVtYmVycyBvZiBmdW5jdGlvbmFsIGFjZXR5bGNob2xpbmUgcmVjZXB0b3JzIGF0IHRoZSBuZXVyb211c2N1bGFyIGp1bmN0aW9uICYjODIxMTsmZ3Q7IHJlZHVjZXMgdGhlIGVuZC1wbGF0ZSBwb3RlbnRpYWwgZm9sbG93aW5nIGFjZXR5bGNob2xpbmUgcmVsZWFzZSAmIzgyMTE7Jmd0OyBCZWNhdXNlIHRoZSB0aHJlc2hvbGQgcG90ZW50aWFsIGlzIG5vdCByZWFjaGVkLCB0aGUgbXVzY2xlIGNlbGxzIGRvIG5vdCBkZXBvbGFyaXplLg==

Cg==

[Qq]

[q] During excitation-contraction coupling, Ca is released from the sarcoplasmic reticulum to bind to …..?

[c]IFNob3cgbWUgdG hlIGFuc3dlcg==[Qq]

[f]IFRyb3BvbmluIEMuIFdoZW4gQ2EgYmluZHMgdHJvcG9uaW4gQywgdHJvcG9teW9zaW4gc2hpZnRzIHRvIGV4cG9zZSB0aGUgYWN0aW4gYmluZGluZyBzaXRlcyBmb3IgbXlvc2luLCBhbGxvd2luZyBjb250cmFjdGlvbiB0byBvY2N1ci4=

Cg==

[Qq]

[q] …… causes release of the myosin head from its binding site on the actin filament?

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[f]IEFUUCBiaW5kaW5nIHRvIG15b3Npbi4=

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[Qq]

[q] The final stage of excitation-contraction coupling is myocyte relaxation, which occurs subsequent to calcium efflux from the cytoplasm. Intracellular calcium is removed primarily via …..?

[c]IFNob3cgbWUgdG hlIGFuc3dlcg==[Qq]

[f]IE5hL0NhIGV4Y2hhbmdlIHB1bXAgKE5DWCkgYW5kIHNhcmNvcGxhc21pYyByZXRpY3VsdW0gQ2EgQVRQYXNlIHB1bXAgKFNFUkNBKS4=

Cg==

Cg==

[Qq]

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