Muscles Flashcards
What percentage of body weight does muscle account for?
40%
What is a myofibril?
The contractile threads (basic rod-like organelle) of a muscle that extend from one end of muscle fibre to the other.
What is a sarcomere?
The basic structural unit of a muscle, consisting of a dark and light bands and long fibrous proteins that slide past each other.
What is the Hydrolysis Process?
Food eaten is synthesized into glucose, which mitochondria then convert to ATP.
Interactions between actin and myosin filaments in sarcomeres are responsible for
Muscle contraction
What is the strength of muscle contraction related too?
To the amount of muscle fibers activated.
What is a twitch?
Sudden rapid stimulation of many fibers
What is the primary role of muscle tissue/fibre?
Contraction
What process is used to convert food molecules into ATP?
Hydrolysis process
Without ____ , cells wouldn’t have the fuel or power to perform necessary functions
Adenosine Triphosphate (ATP)
What 2 factors result in muscle fatigue?
Lack of nutrients and oxygen
Build up of product waste (lactic acid)
In health what is the normal temperature range?
35.8-36.9 centigrade
How many times can a muscle be stretched before rupturing?
3 times the contracted length
Muscle Extensibility definition
The ability for a muscle to be stretched
Muscle Excitability definition
The ability to respond to a stimulus from motor neurone or hormone
Muscle contractility definition
Ability of a muscle to forcefully shorten
Muscle elasticity definition
The ability for the muscle to recoil or bounce back to its original length after being stretched
Opposite partners to prime movers
Antagonist
The state of sustained partial contraction of a muscle
Muscle tone
Properties of muscle tissue
Contractility
Excitability
Extensibility
Elasticity
Location of skeletal muscle
Attached to the bone/skeleton by tendons and skin
Functions of skeletal muscle
Voluntary movements such as; locomotion, facial expressions and other body movements
Skeletal muscle structure
Numerous nucleus placed peripheral.
Striations present.
Very long cylindrical cell shape.
Non branched.
Has blood vessels and nerves associated with it.
Location of cardiac muscle
Only found in the wall of the heart (myocardium)