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Muscular system Natalia Gomez period:5 - Coggle Diagram
Muscular system Natalia Gomez period:5
Action potential in a muscle fiber
The action in a muscle fiber triggers the sequence of actions ultimately results within contraction
Major functions of muscular functions
Produces movement-responsible for all locomotion and manipulation
2.Maintains posture and the bodies position
3.Stablizes joints
4.Generates heat as they contract
Disorders associated with the Muscular system
Fibromyalgia
movement disorder
multiple selerosis
muscle cramps
myostins
nueron muscular disorder
muscular
dystrophy
Neuromuscular junction
A region to which where the motor neuron contracts skeletal muscles
Consists of multiple axon terminals and underlying junctional
Event to a neuromuscular
-Ap arrives at the axon terminal
-Voltage-gated calcium channels then op m up
-The calcium entry causes release with ACH
-The ACH diffuse s across the ACH receptor s
-ACH binding to receptors and opens the gate
-Acerylcholinesterate degrades ACH
3 types of muscles & their functions
Cardiac-walls of the heart and lastly smooth with the unitary muscle
Skeletal-attaches to bone and skin
Smooth-unitary muscle in walls of hollow visceral organs
Sliding filament theory of muscle contraction
states that during contraction, thin filaments
slide past thick filaments, causing actin and myosin to overlap more
– Neither thick nor thin filaments change length, just overlap more
• When nervous system stimulates muscle fiber, myosin heads are allowed to bind to
actin, forming cross bridges, which cause sliding (contraction) process to begin
• Cross bridge attachments form and break several times, each time pulling thin filaments
Muscle coverings
Epimysium: dense irregular connective tissue surrounding entire muscle; may
blend with fascia
– Perimysium: fibrous connective tissue surrounding fascicles
– Endomysium: fine areolar connective tissue surrounding each muscle fiber
Sarcomere
It’s the smallest contractile unit
contains A band with half of an I
Consists are between Z discs
composed of two main protein filaments actin and myosin
Names of all the skeletal muscles
Bicep brachii
● Brachialis
● Brachioradialis
● Deltoid
● External obliques
● Flexor carpi radialis
● Flexor carpi ulnaris
● Frontalis (Epicranius frontal belly)
● Iliopsoas
● Masseter
● Orbicularis oris
● Orbicularis oculi
● Palmaris longus
● Pectinus
● Pectoralis major
● Pronator teres
● Rectus abdominis
● Serratus anterior
● Sternocleidomastoid
● Sternohyoid
● Temporalis
● Tensor fasciae latae
● Trapezius
● Tricep brachii
● Zygomaticus
Anterior/Inferior View
● Adductor longus
● Fibularis longus
● Extensor digitorum longus
● Gastrocnemius
● Gracilis
● Iliotibial tract
● Rectus femoris
● Sartorius
● Soleus
● Tibialis anterior
● Vastus lateralis
● Vastus medialis