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BIO 240 - Exam 3 - Muscles (3.1 A-C) Questions with 100% Actual correct answers | verified | latest update | Graded A+ | Already Passed | Complete Solution $7.99   Add to cart

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BIO 240 - Exam 3 - Muscles (3.1 A-C) Questions with 100% Actual correct answers | verified | latest update | Graded A+ | Already Passed | Complete Solution

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BIO 240 - Exam 3 - Muscles (3.1 A-C) Questions with 100% Actual correct answers | verified | latest update | Graded A+ | Already Passed | Complete Solution

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  • June 19, 2024
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BIO 240 - Exam 3 - Muscles (3.1 A-C)
Functions of skeletal muscle - ANS-move the body, maintain posture, protect and
support, secrete cell signals, regulate elimination of materials, and produce heat

Characteristics of the skeletal mucsle tissue - ANS-Excitability, Conductivity,
Contractibility, Extensibility, and Elasticity

Excitiability - ANS-Ability of muscles to respond to a stimulus

Conductivity - ANS-sedning an electrical change down the length of the cell membrane

Contractability - ANS-filaments slide past each other - causes movement

Extensibility - ANS-ability to be stretched

Elasticity - ANS-return to original length following a lengthening or shortening

Development of Muscle fibers - ANS-multiple myoblasts fuse together and form a
multi-nucleated muscle fiber

Satellite Cell - ANS-support cells that are used for repairing the muscle fibers

Layers of skeletal muscle - ANS-Tendon, epimysium, perimysium, endomysium

Tendon - ANS-A fusion of epimysium, perimysium, and endomysium

Epimysium - ANS-Dense CT; covers the entire outside of skeletal muscle

Endomysium - ANS-Delicate layer; Surrounds individual muscle fibers and provides
electrical insulation, capillary support and binding to neighboring cells.

Perimysium - ANS-Dense; Connective tissue surrounding a fascicle

Connective Tissue Components - ANS-Tendon, Aponeurosis, Deep Fascia, and
Superficial Fascia

Tendon (CTC) - ANS-cord like structure of dense regular CT

, Aponeurosis - ANS-thin, flattened sheet of dense irregular tissue

Deep fascia - ANS-dense irregular connective tissue superficial to epimysium;
separates individual muscles and bind ones with similar functions

Superficial Fascia - ANS-Areolar and adipose CT superficial to deep fascia;
Separates muscles from skin

Somatic Nervous System Control - ANS-Fibers of ONE motor unit are dispersed
through out the muscle

Small motor units - ANS-Fewer muscle fibers; rapid and precise movement

Large motor units - ANS-Hundreds to thousands of muscle fibers; large amount of force

Skeletal Muscle Fiber - ANS-Sarcolemma, Sarcoplasm Myofibril

Sarcolemma - ANS-plasma membrane of a muscle fiber

Sarcoplasm - ANS-cytoplasm of a muscle cell; contains mitochondria and multiple
nuclei

Myofibril - ANS-tightly packed filament bundles found within skeletal muscle fibers

sarcoplasmic reticulum - ANS-specialized endoplasmic reticulum of muscle cells

terminal cisternae of SR - ANS-Expanded ends of the sarcoplasmic reticulum found on
either side of a t-tubule. Important in calcium storage used in muscle contraction

T tubules - ANS-Also called transverse tubules, these are deep invaginations of the
plasma membrane found in skeletal muscle cells. These invaginations allow
depolarization of the membrane to quickly penetrate to the interior of the cell.

Triad - ANS-the group of three (2 terminals and 1 T-tubule)

Neuromuscular Junction - ANS-Where motor neuron innervates the muscle; contains a
synaptic knob, cleft and motor end plate

End Plate Potential - ANS-1. action potential - down the motor neuron axon with an
influx of calcium at the synaptic knob

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