Mod 4 Musculoskeletal system 3 Flashcards
What influences force?
skeletal muscle contraction influence force
How to produce force?
Produces force to power movement (converts ATP into mechanical energy)
What are the three types of muscle tissue?
1) skeletal
2) cardiac
3) smooth
What are the functions of the skeletal muscle
1) Produce movement: responsible for locomotion and balance
2) maintain posture and body position
3) stabilize joints
4) generate heat (contract) (maintain body temp)
The ORDER
Muscle –> fascicle –> fiber –> myfibrils –>sacromeres –> basic contractile unit of skeletal muscles
What do muscles recieve?
a nerve, artery and vein
What are the three levels of muscle tissue?
1) Epimysium, 2) Perimysium 3) Endomysium
Epimysium?
dense irregular, the connective tissue surrounding the entire muscle, may blend with fascia
Perimysium?
Fibrous dense connective tissue surrounding fascicles (groups of muscle fibers)
Endomysium?
Fine areolar connective tissue surrounding each fibre
How do muscles attach to the skeleton?
Muscles span joints (attach to bones at least 2 places, but origin and insertion, they can be direct and indirect
Origin?
The attachment that is relatively fixed (typically proximal)
Insertion?
The attachment that is more moveable, usually distal
Direct attachment?
Fleshy: epimysium fused to the periosteum of bone or perichondrium of cartilage
Indirect attachment?
Indirect: connective tissue wrapping extend beyond muscle as rope-like tendon/sheet-like aponeurosis
Tendon?
Tendons are rope-like bands of connective tissue
What makes up a muscle?
Together a muscle and its tendon made up a muscle-tendon pair
What can muscles do?
Muscles can only pull on tendons or skeletal (never push)