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Anatomy
Muscle tissue and contraction process
16
Anatomy
Undergraduate 2
12/09/2009

Additional Anatomy Flashcards

 


 

Cards

Term

Nerve impulse for muscle contraction

 

thru neuromuscular junction

Definition

1) Electrical signal

 

2)Neurotransmitters r realeased from the Synaptic Nob into the Synaptic cleft

 

3) Neurotransmitters attach to the motor end plate and send motor impulse/signal

 

4)to Muscle fibers

 

5) reaches the Triad (terminal cisternae & the T-tubules), which tells the 

 

6) thus initiates the Sarcoplasmic reticulum to release calcium

 

7) actin and myosin react

 

 

Term
In a relaxed muscle
Definition
Term
During contraction
Definition

Actin myofilaments(I band)

sides toward the center of

Myosin myofilaments(H band)

 

& the Sarcomere shortens

Term
In a fully contracted muscle
Definition

Actin myofilaments (I-band)

r pulled into the H zone, which then disapears

I-band narrows

A-band remains unchanged

 

 

Term

basic fully contracted muscle 

____________ happens

Definition

A-band = stays the same

 

I-band = shrinks, shortens, narrows

 

H-zone = disapears

 

Sarcomere = shortens

 

Z-disk = stays the same

 

M-line = stays the same

Term

Muscle tissue organization & cells

from superficial to deep 

Definition

Epimyseum

 

Muscle

 

Perimyseum

 

Fasicles

(bundle of muscle fibers)

 

Endomyseum

 

Muscle fibers

 

Myofibrils

(bundle of myofilaments)

 

Myofilaments

Term

Perimyseum

tissue

Definition

Dense irrg CT sheath

 

surrounds fasciles

 

Middle layer

Term
Epimysium
Definition

Dense irr CT

 

surrounds whole skeletal muscle

 

outer layer(superficial)

 

 

Term
Endomysium
Definition

Areolar CT

 

surrounds each muscle fiber

 

Deep layer

Term

Superficial fascia

(muscle)

 

tissue

Definition

separates muscle from skin

 

Areolar & Adipose CT

Term
Deep fascia
Definition

Separates indiv muscles, connects neighboring muscles

 

Dense irr CT

Term
Role of calcium ions in muscle contraction (shortening) of the sarcomere
Definition
Term
Motor unit
Definition
Term

Slow, Fast & Intermediate 

Muscle fibers

Definition
Term
Isometric vs Isotonic contraction
Definition
Term
Concentric vs Eccentric contraction
Definition
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