Muscular System Flashcards
Aka “striated muscles”
Skeletal muscle
Type of muscle with no striations
Smooth Muscle
Spindle shaped type of muscle
Smooth Muscle
Cover bones and cartilages
Skeletal Muscle
Forms the bulk of the heart walls
Cardiac Muscle
Portion between two Z-discs
Sarcomere
Part of sarcomere that disappears when the muscle contracts
H zone
Actin alone
I-band
Two types of myofilaments
Thin filaments and thick filaments
Myosin plus actin
A-band
Two uninucleate muscles
Cardiac Muscle and Smooth Muscle
Found of the walls of hollow visceral organs
Smooth Muscle
Aligned along the length of the myofibrils
Sarcomere
Made up of double stranded F-action protein molecules
Actin
Thin filament that covers the binding sites
Troponin I
Spiral over the actin that covers the actin binding sites
Tropomyosin
Myosin head with attachment sites of the myosin
Superior head
Myosin head with attachment site for ATP
Inferior head
Conveys action potential towards sarcoplasmic reticulum
T-Tubule
Stores and release calcium
Sarcoplasmic reticulum
Muscle bundle/fascicle
Perimyseum
Skeletal muscle fiber
Epimysium
Muscle fibers
Endomysium
Has branching cell fibers joined by a special gap junction called intercalated discs
Cardiac Muscle
Center of the H Zone
M-line
Lighter central area of the A-band
H Zone
Contains tiny protein rods that hold adjacent thick filaments together
M-line
Forms a complex called troponin-tropomyosin complec
Troponin T
High affinity with calcium
Troponin C
Cytoplasm of a muscle fiber
Sarcoplasm
Cell membrane of a muscle fiber
Sarcolemma
Ability to receive and respond to a stimulus
Irritability/Responsiveness
Ability to forcibly shorten when adequately stimulated
Contractility
Ability of muscle fibers to stretch
Extensibility
Ability to recoil and resume original resting length after being stretched
Elasticity
Allows the motor neurons to transmit signals to muscle fiber
Neuromuscular junction
Neuromuscular junction where acetylcholine is stored
Synaptic vesicle
Main neurotransmitter of neuromuscular junction
Acetylcholine
Aka “nicotinic receptors”
ACH Receptors
Aka “Muscarinic Receptors”
ACH Receptors
ATP generation pathway with coupled reaction of creatinine phosphate and ADP
Direct phosphorolation
ATP generation pathway using aerobic cellular respiration
Aerobic pathway
ATP generation pathway using glycolysis and lactic acid formation
Anaerobic pathway
Products of aerobic pathway
32 ATP per glucose and CO2H2O
Products of direct phosphorolation
1 ATP per CP and creatine
Products of anaerobic pathway
2 ATP per glucose and lactic acid
No change in muscle tone
Isotonic contraction
Two types of isotonic contraction
Concentric and eccentric contraction
Load impose is constant
Isotonic contraction
Muscle shortening
Concentric contraction
Muscle lengthening
Eccentric contraction
No change in joint angle
Isometric contraction
Tension in the muscle keeps increasing
Isometric contraction
Attached to the immovable or less movable bone
Origin
Attached to the movable bone
Insertion
Serves as the anchor or leverage point
Origin
Moves toward the origin
Insertion
Moving the arms forward
Flexion
Extending the arms backward
Extension
Leg forward
Extension
Leg backward
Flexion
Arms sideways
Abduction
Arms at the side of the body
Adduction
Rotating arms outward
External rotation
Rotating arms inwards
Internal rotation
Moving head side to side
Rotation
Moving hand in a circular direction (outwards to inwards)
Circumduction
Aka “prime mover”
Agonist
Passively elongate to allow the agonist
Antagonist
Performs the same as the agonist
Synergist
Specialized synergists
Fixator
Obstructs unwanted motion
Synergist
Hold a bone still or stabilize the origin of a prime mover so all the tension can be used to move the insertion bone
Fixator
Muscle type with epimysium, perimysium, and endomysium
Skeletal muscle
Muscle type with endomysium attached to the fibrous skeleton of the heart
Cardiac Muscle
Muscle type with endomysium
Smooth Muscle
What neurotransmitter removes ACH
Achesterase
Tension in the muscle keeps increasing
Isometric contraction
What happens when calcium is released in sarcoplasmic reticulum
Action potential
What happens when calcium is stored in sarcoplasmic reticulum?
No action potential