muscles part 1 Flashcards
what 3 words should you remember about skeletal muscle tissue? does it tire easily?
skeletal, striated, voluntary, yes it also contracts rapidly
what 3 words should you remember about cardiac muscle tissue?
cardiac, striated, and involuntarily
-beats at steady rate by heart’s pacemaker
what 3 words should you remember about smooth muscle tissue? where is it found?
visceral, nonstriated, and involuntary
-found in stomach, urinary bladder, respiratory passage
what are the Four special characteristic of muscles that enable them to do their job?
excitability (responsiveness) ability to respond to a stimulus
contractility ability to shorten forcibly when stimulated (this sets muscles apart from other tissue)
extensibility
elasticity ability to recoil and resume resting length after stretching
what are the four functions of muscles?
1) produce movement
e.g propel substances down digestive tract and enable quick response eye contact, frowning
2) Maintain posture and body position.
3)stabilize joints strengthen an dstabilize
4)generate heat maintains normal body temperatrue
what is the difference between skeletal from cardiac and smooth muscle?
skeletal muscles need/have their own nerve ending that controls their activity, whereas other muscles do not need nerve stimulation.
why are skeletal muscles rich in blood supply?
they use huge amounts of energy and constant delivery of oxygen and nutrients via the arteries
what are the three different types of connective tissue sheaths
1) Epimysium
overcoat; dense, irregular, CT
2) Perimysium and fascicles.
bundles are called fascicles surrounding each fascicle is perimysium (dense irregular CT)
3) Endomysium
between individual muscle fibers (fine areolar CT)
what happens when a muscle contracts?
the muscles insertion moves towards the immovable or less movable bon the muscles origin
what is the difference between indirect and direct attachment?
indirect has a tendon or aponeurosis while directly attached to the periosteum or perichondrium
what is a muscle fiber
elongate multinucleate cell looks striated
what does sacroplasm have large amount of?
glycosomes
what is myoglobin similar to? why is it important?
hemoglobin? full of oxygen
what are myofibrils?
single muscle fiber made of chain of sarcomere
what is found between two succesive z discs?
sacromeres
