Muscular Concept Map
Major functions of the muscular system
Action potential in a muscle fiber
Sarcomere
Neuromuscular junction
Names of all the skeletal muscles (including the facial muscles) –only my list
3 types of muscles & their functions
Sliding filament theory of muscle contraction
Muscle coverings(TB Fig. 8.1)
the nerves impulse known as action potential propagated down a motor neuron to a skeletal muscle fiber where sodium ion enter to the muscle fiber and started contraction in the muscle fiber.
Fascia blends with the epimysium, the layer of connective tissue around each skeletal muscle
The perimysium extends inward from the epimysium; it surrounds bundles of skeletal muscle fibers, called fascicles, within each muscle
Each muscle cell (fiber) is covered by a connective tissue layer called endomysium
DLCE of the back of the muscle body: sternocleidomastoid, deltoid, Rnomboid major, Tricep brachii, Extensor Digitorum,extensor capi radialis, Extensor carpi ulnaris, biceps famoris:long bone, Gastrocnemius, soleus , Calcaneal(achilles)tendom , Trapezius, Infraspinatus, Teres Major, Latissimus Dorsi, gluteus maximus, semitendinosus, semimembranosus, and Fibularis brevis
DLCE of the front of the muscle body: sternocleidomastoid, trapezius,deltoid, Biceps brachil, Brachioradialis, Flexor carpi radialis, Flexor carpi ulnaris, Gracilla, Quadriceps femoris: Rectus femoris, Vastus medialis, soleus, Fibularis longus, Extensor digitorum longus, Pectoralis Major, serratus anterior, rectus abdominis, Abdominal external oblique, iliopsoas, sarterius, Adductor magnus, Vastus lateralla, Gastronemius, and Tibialia anterior.
DLCE Muscles of face: frontalis, Temporallis, zygomaticus orbicularis oris, orbiciaris oculi, masseter, and platysma
muscles are organs that generate forces to cause all types of movement the 3 types of muscle tissue in the body are skeletal, smooth, and cardiac muscle
step 4:acetylcholine diffused across the synaptic cleft and binds to acetylcholine receptors which contain ligand gated cation channels
step 5: these ligand-gated cation channels open
step 3:calcium entry cause synaptic vesicles to release acetylcholine via exocytosis
Neuromuscular junction:a synapse between a motor neuron and a muscle fiber that it regulates
the myofliament, these are composed of both thick(myosin) and thin(action) filament. mitochondria are dispersed through the muscle fibers, recall that mitochondria supply energy, ATP, needed for muscle contraction. Two types of transport system are found within the muscle. the sarcoplasmic reticulum is a network of tube that run parallel to the myofilament. The transverse tubules run perpendicular to the filament the entire muscle fiber is surrounded by a membrane,the sarcolemma.
if exanded, the light and dark bands are shown as individual thick and thin filament
the Z line is the boundary between sarcomeres, named after its shape
skeletal muscle is a voluntary and their function is it active control the function of the muscle
cardiac muscle and their function is only found in the heart and pump blood throughout the body
smooth muscle is non-voluntary and their function is to help digestion and nutrient collection
step 6:Sodium ions shown here in red enter the muscle fiber and potassium ions shown here in blue exit the muscle fiber. The greater inward flux of sodium ions relative to the outward flux of potassium ions causes the membrane potential to become less negative.
step 2:In the axon terminal, calcium channels is open and the ions diffuse into the terminal
step 7: once the membrane potential reaches a threshold value an action potential propagates along the sarcolemma
step 1:The nerve impulse known also as a action potential from the brain or spinal cord to travel to the length of the axon of a motor neuron to an axon terminal.