Week 5 - Muscular System

Question 1

3 layers of connective tissues contained in muscle

Answer 1

epimysium
perimysium
endomysium

Question 2

epimysium

Answer 2

dense layer of collagen fibers that surrounds the entire muscle
connected to the deep fascia

Question 3

perimysium

Answer 3

divides the skeletal muscle into a series of compartments; each contains a bundle of fascicles, collagen and elastic fibers, blood vessels, and nerves

Question 4

endomysium

Answer 4

surrounds the individual skeletal muscle cells and loosely interconnects adjacent muscle fibers
contains capillary networks that supply blood to the muscle fibers, myosatellite cells that take part in the repair of damaged tissue, and nerve fibers that control the muscle

Question 5

tendon

Answer 5

bundle formed by collagen fibers

Question 6

myoblast

Answer 6

embryonic cells forming individual multinucleate skeletal muscle fibers

Question 7

myofibrils

Answer 7

can actively shorten and are responsible for skeletal muscle fiber contraction consist of microfilaments: thin- made of actin and thick- made of myosin and titin- elastic
anchored to the inner surface of the sarcolemma

Question 8

sarcomeres

Answer 8

smallest functional units of muscle fiber
contains thick filaments, thin filaments, proteins that stabilize the positions of the thick and thin filaments, and proteins that regulate the interactions between thick and thin filaments
A bands= dark
I bands= light

Question 9

what happens when a skeletal muscle fiber contracts?

Answer 9

H bands and I bands of the sarcomeres get smaller
the zones of overlap get larger
Z lines move closer together
the width of the A band remains constant

Question 10

sliding filament theory

Answer 10

the contraction weakens with the disappearance of the I bands, at which point the Z lines are in contact with the ends of the thick filaments during a contraction, sliding occurs in every sarcomere along the myofibril