Skeletal Muscle Flashcards
What are the Functions of Skeletal Muscle?
- To move!
- Venous return of blood to the heart
- Breathing (diaphragm)
- Communication
- Thermogenesis (body temp regulation, produce Heat)
- Metabolic homeostasis
What are Myofibres?
- AKA muscle fibres
- Named for their elongated shape
- One fibre can be 10-100um in diameter and up to 2.5 feet in length
What is Myostatin?
Myostatin is a protein that acts as a negative regulator of muscle growth, inhibiting muscle development and promoting muscle atrophy.
Where is Muscle Tissue Found in the body?
Properties of Muscle Tissue:
Function: specialized to contract (shorten) and create the force required for movement
Properties:
- Excitable – muscle responds to nervous stimulation
- Contractile – muscles contracts (shortens) to create movement
- Extensible – muscle can be stretched
- Elastic – muscle recoils to its original size and position after being stretched
What would increase the diameter of a muscle fiber?
Excersize, lifting weights
What are the 3 layers of Muscle Fiber?
Sacrrolemma - Cell Membrane
Sacroplasma - Cytoplasm of Muscle Cell
Myofibrils - Contractile proteins
What are Fasicles?
- Groups of muscle fibres bundled together
- Fascicles are bundled together to form the muscle
What are Tendons?
Tendons Connect Muscles to Bone
What are Aponeurosis?
flat extensions of tendon
What are Fascia?
sheet/band of fibrous connective tissue that lies deep to the skin and surrounds muscles/other organs of the body, made primarily of collagen
What is Superficial Fascia?
(subcutaneous)
- Separates skin from muscle, insulates and provides protection
- Contains: adipose tissue, blood vessels and lymph vessels
What is Deep Fascia?
- Holds similar muscles together, occupies space between muscles
- Contains: nerves and blood vessels
What are the 3 Extensions of the Deep Fascia?
Epimysium: surrounds the entire muscle
Perimysium: deep to the epimysium, wraps muscle fascicles
Endomysium: deepest layer, wraps each individual myofibre
Muscle layers from deep to superficial: