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PLN 103 Study Guide - Final Guide: Electronegativity, Acetylcholine, Sarcolemma

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violetfrog468
21 Oct 2012
School
Ryerson University
Department
Physiology
Course
PLN 103
Professor
Ottilie Kate Grisdale

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Document Summary

3 types of muscles: skeletal; moves body muscle via muscle fibre functional: >consists of fascicles, which has bundles of muscle fibres (muscle fibres are made outta myoblasts represented through nucleus, which rep fused myoblasts (satellite reps unfused myo)) >each muscle fibre is separated by perimysium (which consists of blood vessels + nerves) >facicles consists endomysium (which contain satellite cells; as well mitochondria, nuclei on the myoblasts & other organelles) >transverse tubules carry action potential (has the electrical impulse) >sarcomers: units tht have thick (myosin) + thin (actin) filaments + regulatory protein + stabilizing protein. >i band: thin filament, actin, has troponin (tropomyosin interact to prevent/turn on contraction) >m line: centre of h line (consists of protein fibres) Muscle fibres are controlled by motor neurons (4-6 fibres per muscle unit) Neuromuscular junction: (place where the terminal portion of a motor neuron axon meets a muscle cell but is separated by the synaptic cleft)

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Related Questions

Which statement best describes how the body moves?

(a) Skeletal muscles, which are made of fibers, nerves and blood vessels, contract in order to make the body move.

(b) Cardiac and smooth muscles are made of muscle fibers, nerves, and cartilage and are responsible for all movement in the body.

(c) Smooth muscles, which are made of blood vessels, fibers, and nerves, allow for all activities that use slow-twitch muscle fibers.

(d) Skeletal muscles, which are made of tendons, nerves, and fibers, line the body cavities and allow for support and movement.

What is the length tension relationship in skeletal muscle?

External stimuli are communicated to the brain by means ofelectrical signals propagating along nerve cells at a speed ofapproximately 29 m/s. Similarly, electrical messages are sent atthe same speed from the brain along nerve cells to the muscles.Reflex actions are controlled by a relatively simple nerve circuitfrom a muscle to the spine and back to the muscle. Estimate thereflex time for a stimulus at the knee. (Assume that the signalresulting from the stimulus must travel a distance ?s = 1 m.)