Musculoskeletal System 3 Flashcards
4 Functions of the musculoskeletal system
Movement
Heat
Posture
Storage
Movement of substances
What does excitability mean?
Conduct electric current
What does contractability mean
Ability to shorten
What does extensibility mean
Ability to stretch
What does elasticity mean
Spring
Difference between striated and non-striated
Striated - parrelel bundles
Non-striated - randomly arranged
Characters of skeletal muscles
Striated
Voluntary
Attachment
Characteristics of cardiac muscle
Striated
Involuntary
Auto-rhythmic
Characteristics of smooth muscle
Non-striated
Involuntary
Found in walls of blood vessels
Iris
Gut
2 functions of skeletal muscle
Attaches between bones
Creates movement between joints
Role of fascia
Organises muscles
Secures them to the skin
Provides stability
Mostly made of collagen
What are myocytes?
Long cells that make up skeletal muscles
How many skeletal muscles in the body?
640
What is the function of sarcomella?
Membrane of skeletal muscle fibre
Tubes extending from muscle into cell
Transverse tubules
Muscle cell cytoplasm
Sarcoplasm
Sarcoplasmic reticulum function
Stores calcium needed for muscle contraction
Myoglobin function
Iron and oxygen binding protein
Why are mitochondria close to the myoglobin?
For aerobic respiration
Why are we born with a set number of skeletal muscle cells?
Once mature muscle cells are forms myocytes then can no longer under go mitosis.
Define myofibrils
Cylindrical structures formed of bundles of protein filaments within the muscle fibre.
Describe the to myofilaments that make up the myobrils
Actin - thin filaments
Myosin - thick filaments with golf club shaped heads
What is meant by sarcomeres?
