muscles Flashcards
(19 cards)
sliding filament model
calcium ions link to troponin and drag tropomyosin out of the way so myosin and actin can bind and release energy causing heads to move across each other
3 types of muscles
skeletal- striped
cardiac- striped
smooth-
4 functions of muscle tissue
produce movement
stabilize joints
generate heat
maintain posture
muscle layers inside out
Myofilaments
Sarcomeres
myofibril
muscle fibres- surrounded by
sarcolema
fasicles
muscles
Gross structure of skeletal muscle
Muscle fibres surrounded by epimysium
Fibres are grouped as fasicles wrapped in perimysium
Fasicles are lots of muscle cells wrapped in endomysium
Mysiums merge at end to form tendon and allow movement
Sarcoplasmic reticulum
Muscle cell walls full of calcium for transport and storage
T tubules
Tubes deep in cell that AP runs through
Ie tunnels for calcium
Troponin
Where calcium bonds
Tropomyosin
Bodyguard that moves when tropomin is latched
Electric synapses
Immediate- group texts
Chemical synapsrs
Slower more personal texts
Neuromuscular junction
Connection point where ns tells muscle to move
Synapse (aka connection) between neuron and muscle fibre
Neuromuscular Junction flow
- Neuron carries ap (signal) to muscle
- ACh released into synaptic cleft
- ACh binds to satcolemma
- Ion channels open and Na enters cell, triggering AP and…
Contraction
What is ACh
Acetylcholine-
Neurotransmitter that releases into cleft and binds to sarcolemma, thus causing muscle contraction
Where is smooth muscle
Walls of hollow organs
Ex stomach, intestines
How does smooth muscle work
2 layers alternate contracting and relaxing which causes what’s inside to mix and push through
Smooth muscle contraction
Slow so longer to contract buy maintains tension
Perk of smooth muscle
Contracts when stretched to hold large volumes ie peeing
Sodium potassium pump
Sodium out
Potassium in
Resets everything post contraction
