muscle tissue Flashcards
what is unique about muscle tissue
it can transform chemical energy (ATP) into directed mechanical energy, which can extert force for movement
what are the 3 types of muscle tissue
- skeletal
- cardiac
- smooth
what 2 kind of muscle cells are elongated and considered muscle fibers
- skeletal
- smooth
where is skeletal muscle tissue found
attached to bones and skin
does skeletal muscle tissue have striations
yes.
is skeletal muscle tissue considered voluntary
yes.
where is cardiac muscle tissue found
the heart
what unique featured does cardiac muscle tissue have
- striations
- branched
- intercillated discs
is cardiac muscle voluntary
no. it is involuntary
where is smooth muscle tissue found
in visceral organs
what are examples of visceral organs that contain smooth muscle tissue
- stomach
- urinary bladder
- airways
is smooth muscle tissue striated
no. it is not striated
is smooth muscle tissue voluntary
no. it is involutary
what is the purpose of flexors
bending
what is the purpose of extensors
straightening
can muscles generate force without being shortened
no. it is impossible for muscles to generate force without them being shortened
what are the 4 main characteristics of all muscles
- excitablility
- contractability
- extensibility
- elasticity
what is excitability in muscles
the ability to respond to stimuli
what is the stimuli that causes excitability in muscles
nerve impulses
what is contractability in muscles
when the muscle shortens from being stimulated
what is extensability in muscles
when muscles are stretched
what is elasticity in muscles
the muscle’s ability to recoil to its resting length
what are the 4 important functions of muscles
- produce movement
- maintain posture and body position
- stabilize joints
- generate heat as they contract
what is an example of muscles generating heat through contraction
shivering
what is the smallest contractile unit of muscle fibers
sarcomere
what are myofilaments
an orderly arrangement of actin and myosin myofilaments within a sarcomere
are actin or myosin myofilaments thin
actin
are actin or myosin myofilaments thick
myosin
what causes the light striations
the i band
does the i band have actin, myosin, or both
only actin
what is the a band
the entire span of myosin
what causes dark striations
the a band
what is the z disc
the zig zag line at the center of the i band
what is the M line
the line that goes through the center of the A band or H zone
what is the H zone
the area of the sarcomere that only contains myosin
