Chapter 9 Flashcards
Name the large superficial muscles of the body
Sternocleidomastoid Levator scapulae Spelnius Platysma Deltoid Trapezius Pectoralis major/minor Serratus anterior External intercostals External abdominal oblique Latissimus dorsi Rectus abdominus Biceps branchii Triceps brachii Brachioradialis Extensor carpi radialus longus Tensor fasciae latae Sartorius Gracilis Adductor Magnus Gluteus maximus Biceps femoris Vastus medialis and lateralis Peroneus longus Tibialis anterior Gastrocnemius
What muscle has long slender cells called muscle fibres
Skeletal
What is muscular tissue used for
Movement
Stability of body
Control of body passages and openings
Heat production
What can muscular cells carry out
Contractibility Excitability Conduction Elasticity Extensibility
What is skeletal muscle made up of
Connective
Nervous
Muscular
Blood vessels
What is the muscle attachment at each end called
Origin. Stationary end
Insertion. Moving end
What is the structure of a muscle fibre
Long slender cell with multiple nuclei in sarcolemma
What is the sarcoplasm occupied by and what are they
Myofibrils. Thread like bundles of protein filaments
What are myofibrils made up of
Thick filaments = myosin
Thin filaments = actin
What causes skeletal muscle to contract
Stimulation of somatic motor neuron (contractility)
What is the neuromuscular junction
Where nerves and muscle fibres meet at a complex of synapses
Where does each tip of nerve fibre end
Synaptic knob
What happens at the narrow gap and what is the gap called
Separates synaptic knob from sarcolemma
Synaptic cleft
What does the synaptic knob contain
Synaptic vesicles filled with chemical ACh
What breaks down ACh to terminate stimulation of muscle fibre
Enzyme acetylcholinesterase found in synaptic cleft and part of sarcolemma
