Muscular Tissue 2: Skeletal Cont.

Question 1

What are the roles of Myoglobin and Glycogen in the muscle?

Answer 1

Myogloblin: Oxygen storage (close relative to hemoglobin)

Glycogene: Energy Store

Question 1

What are fibres rouge and blanc? What about intermediate?

Answer 1

Rouge: Contraction Lent; Fatigue resistant; gravity muscles
Blanc: Contraction Rapid; not resistent to fatigue

intermediate can be both depending of charge (running vs weights)

Question 2

What are myotendineuse and Costameres?

Answer 2

Junction myotendineuse: Les filaments d’actine du dernier disque Z
protéines transmembranaires qui
s’attachent à la lame basale qui
elle-même s’attache aux fibres collagène
du tendon

Cotameres: Lateral; Complexes de protéines transmembranaires qui relient les myofibrilles (chaque strie Z) situées sous le sarcolemme (membrane basale

Question 3

What is the role of Invaginations marquées du sarcolemme in jonction myotendineuse ?

Answer 3

Augmente la solidité de la jonction en diminuant
la quantité de force transmise par unité de
surface

Question 4

What is the 3 roles of Costameres?

Answer 4

• alignement des sarcomères au cours de la contraction
• protection du sarcolemme d’une tension excessive (repartition de force)
• transmission latérale de la force aux enveloppes du muscle

Question 5

What is endomysium?

Answer 5

The endomysium is a delicate layer of areolar connective tissue that surrounds each individual muscle fiber, or muscle cell1. It is located within the muscle, hence the name ‘endomysium’, which means ‘within the muscle.

Question 6

What is a muslce cell?

Answer 6

Muscle fiber, combination of aligned sacromeres (myofibrille)

Question 7

What is Périmysium?

Answer 7

The perimysium is a sheath of connective tissue that groups muscle fibers into bundles, also known as fascicles

Question 8

What is Eminence cytoplasmique?

Answer 8

Every muscle cell will receive one innervation
Axon will divide, de-myelinate and go into the Eminence cytoplasmique

Question 9

What are the properties of Motoneuron alpha?

Answer 9

axones qui innervent le muscle au niveau de la plaque motrice

Question 10

What are the two roles of sensitive pathways in muscles?

Answer 10

’informer le système nerveux de la tension développée dans le muscle

rôle essentiel dans la régulation du tonus musculaire et les réflexes ostéotendineux

Question 11

What is a Fuseau neuromuculaire?

Answer 11

Between Muscle fibers

Contracts when muscle contracts

capteur sensible à l’étirement responsable du réflexe myotatique

Partie centrale non contractile

Parties périphériques contractiles

Question 12

What is Organe neuro-tendineux de Golgi?

Answer 12

récepteur situé dans le
tendon, au niveau de la jonction myotendineuse, sensible à
l’étirement produit par la contraction du muscle qui s’exerce
sur le tendon

Question 13

Innervation of Fuseau neuromuculaire?

Answer 13

Double Innervation:
gama motoneurons

Sensitive par des fibres de type Ia et II

Question 14

Explain the Réflexe myotatique

Answer 14

Hitting the tendon leads to a pull of the muscle.
This pulling is sensed byt the Ia fibers and II fibers of the fusseau neuromuculaire
This information is transmitted to the spinal cord
Motoneruon alpha will lead to flexing of muscle
Motoneuron gama will activate the contractile part of the fussea neuromuculaire

Question 15

Explain the golgi organ reflex.

Answer 15

Réflexe myotatique inverse
Sensitive for ettirement of tendon: Type Ib activation

During Contraction the activation of the golgi sends an excitatroy signal to the spinal cord at an inhibitory neuron →

The inhibitory neuron will block the Motoneuron alpha activity to prevent over contraction