Lecture 8 Flashcards
What are the three types of muscle tissue?
skeletal, cardiac, smooth
What are the properties of muscle tissue?
excitability, contractility, elasticity, extensibility
What is cardiac muscle?
located in heart myocardium, auto-rhythmic, involuntary
What does cardiac muscle look like?
Y shaped or branched fibers, striated
Where is smooth muscle found?
walls of visceral organs
What is the shape of smooth muscle?
fusiform shape
Does smooth muscle have striations?
no
Is smooth muscle fatigue resistant?
yes
Is smooth muscle voluntary or involuntary?
involuntary
What shape is skeletal muscle?
large cylindrical
How is skeletal muscle formed?
fusion of myoblasts
How is skeletal muscle innervated?
neuromuscular junctions
Is skeletal muscle vascular or avascular?
vascular
What does skeletal muscle look like?
striated
How many nuclei does cardiac muscle have?
uni or bi (one or two)
How many nuclei does smooth muscle have?
one
How many nuclei does skeletal muscle have?
multiple
What are the special features of cardiac muscle?
intercalated discs, auto rhythmic
What are the special features of smooth muscle?
fatigue resistant
What are the special features of skeletal muscle?
innervated at the neuromuscular junction, vascular
What are the functions of skeletal muscle?
movement, maintenance of posture, temperature regulation, storage and movement of materials, support abdominal organs, joint stabilization
What is the endomysium?
wraps muscle fibers
What is the perimysium?
wraps fascicles
What is the epimysium?
wraps around multiple muscle fascicles; wraps entire muscles
What is deep fascia?
wraps muscle groups
What are muscle fibers wrapped by?
endomysium
What are tendons?
connect to muscles
Where doe tendons connect?
muscles to bone; skin
What is an aponeurosis?
a flat tendon
What is the difference between thick and thin filaments?
What is the sliding filament mechanism?
What are myofibrils?
What are sarcomeres?
What is muscle excitability?
What is the sarcoplasm?
jelly stuff between the myofibrils of the muscle fibers
What is sarcoplasmic reticulum?
What is the terminal cisternae?
What is a T-tubule?
What is the triad?
What is muscle contraction?
What leads to muscle contraction?
thick and thin filament interaction
What is muscle relaxation?
What covers a muscle group?
deep fascia
What covers a muscle?
epimysium?
What covers a fascicle?
perimysium
What covers a myofiber?
endomysium
