Notes On Muscular System Test 7 Flashcards
What are the four traits of muscles
- Excitability/ Irritability
- Contractability
- Extensibility
- Elasticity
What does excitability/ Irritability mean
Ability to respond to stimulus (Electricity)
What does contractability mean
Ability to shorten (weight lifting)
What does extensibility mean
Ability to lengthen (flexibility)
What does elasticity mean
The Ability of a muscle to return to its original shape
What are the three types of muscles
- Skeletal
- Smooth/ Visceral
- Cardiac
Where does the skeletal muscles attach, is it striated, and is it voluntary or in-voluntary
- All over the body
- It is striated
- It is voluntary
Where are the smooth/ visceral located, is it striated, and is it voluntary or in-voluntary
- Intestines, Stomach, Blood cells
- Non-Striated
- In-voluntary
Where is the cardiac muscle, is it striated, and is it voluntary or in-voluntary
- In the heart
- Striated
- in-voluntary
What are the three points of attachment
- Origin
- Insertion
- Fascia
Describe Origin
Part of muscle that doesn’t move and is USUALLY proximal
Describe insertion
Part of the muscle that moves USUALLY distal
Describe Fascia
White sheet that covers muscle
Muscle Belly
fleshy body of muscle between slender points of attachment (Middle of muscle)
Muscle fascicle
layers of tough connective tissue surrounding large skeletal muscles
(CUT THE MUSCLE BELLY IN HALF)
What’s a fiber
A muscle cell
Muscle Myofibrils
Long cylindrical structures in each muscle fiber
What are the circular grippies called in the sliding filament theory
Myosin
What are the square grippies called in the sliding filament theory
Actin
What is the element that floods the motor units in the sliding filament theory
Calcium
What is a muscle twitch
ONE muscular contraction and ONE relaxation
What is muscle tetanus
A continuous contraction
What is tonus
normal, continuous state of partial muscle contraction
What’s a prime mover
muscles responsible for movement
