Musculoskeletal System | Muscle Mechanics | Twitch, Summation, & Tetanus

Ninja Nerds!

In this lecture Professor Zach Murphy will be teaching you about Twitch, Summation, and Tetanus. During this lecture we will be discussing the phases of the muscle twitch, the difference between isometric and isotonic contractions, along with their graphical representations. We hope you enjoy this lecture and be sure to support us below!

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Don't mind me.
0:22 muscle fiber types(other videos)
0:38 [Video main topic] Graded muscle responses (2 main types of stimuli)
1:03 Resting membrane potential/Threshold potential(muscle cell)
1:08 Graded Response depends on Frequency and Strength of [Neural Stimuli]-primary(Somatic) stimulus for skeletal muscle fibers
2:05 Muscle Twitch relates to Motor Unit
2:23 Twitch=Rapid muscle contraction(response) from one neural stimulus
3:10 Motor Unit= motor neuron + muscles fibers (sup by motor neuron)
3:47 Recap
4:38 Structure of skeletal muscle
5:15 3 phases of muscle twitch
1)Latent
2)Contraction
3)Relaxation


10:21-contraction(cool)
11:05 Max Voltage-end of contraction(peak?) activates gates, opens channels for potassium ions to leave cell
11:57 (Relaxation) Tension decreases- reverse slide?
12:46 Recap muscle twitch
17:32 Easy on that sodium ion influx, they say the sarcoplasmic reticulum calcium release really stings when it gets in your 👀.
Later mania.
What up depression.

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[TDaps-]

Hi, one correction I would like to note is that the example given in the video is spatial summation since multiple neurons were used for stimulation. Temporal summation would be used in the case of one frequently firing neuron. Other than that, thank you so much for this video, these are amazing resources!

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