UNIT 3 EXAM HELP GUARANTEED SUCCESS NEW UPDATE
2022
3 types of muscles
- The main function of the muscular system is movement.
- There are three types of muscle tissue: skeletal, cardiac, and smooth.
Skeletal
Voluntary, striated, multiple nuclei, parallel
- Skeletal muscle is voluntary.
- These muscles are attached to bones and are responsible for their movement.
- Skeletal muscle consists of long fibers and is striated due to the repeating patterns of the
myofilaments (made of the protein actin and myosin) that make up the fibers.
Cardiac
Involuntary, striated, intercalated disc (made of
desmosomes and gap junctions) branched
- Cardiac muscle is found in the heart.
- Cardiac muscle is striated like skeletal muscle, but differs in that the plasma membrane of the
cardiac muscle causes the muscle to beat even when away from the heart.
- The action potentials of cardiac and skeletal muscles also differ.
Smooth
- Smooth muscle is involuntary.
MYOSIN UNIT 3 EXAM HELP GUARANTEED SUCCESS NEW
UPDATE 2022
,UNIT 3 EXAM HELP GUARANTEED SUCCESS NEW UPDATE
2022
- It is found in organs and enables functions such as digestion and respiration.
- Unlike skeletal and cardiac muscle, smooth muscle is not striated.
- Smooth muscle has less myosin and does not generate as much tension as skeletal
muscle.
Involuntary, NO STRIATIONS, spindle shaped, found in hollow organs
Muscle is electrically excitable
Action potentials (AP) will cause a release of a NT
(neurotransmitter), the NT will bind to receptors on
muscle cells causing them to be “turned on”
Sarcomeres:
Sarcomeres are composed of long, fibrous proteins as filaments that slide
past each other when a muscle contracts or relaxes. Two of the important
proteins are myosin, which forms the thick filament, and actin, which forms
the thin filament. Myosin has a long, fibrous tail and a globular head, which
binds to actin.
Arrangements or actin
and myosin Contractile
unit of muscle
H zone – contains
MYOSIN UNIT 3 EXAM HELP GUARANTEED SUCCESS NEW
UPDATE 2022
, UNIT 3 EXAM HELP GUARANTEED SUCCESS NEW UPDATE
2022
only myosin I band
– contains only
actin
A band – contains actin
and myosin M line
anchors myosin
Z-disc anchors thin filaments
When a muscle goes through contraction, the H zone and I
band become smaller/start disappearing
Muscle Contraction
Muscle contraction is the activation of tension-generating sites within muscle
fibers. In physiology, muscle contraction does not necessarily mean muscle
shortening because muscle tension can be produced without changes in
muscle length such as holding a heavy book or a dumbbell at the same
position.
An AP (action potential) is sent from the cell body of a neuron
after it depolarizes (remember that depolarization happens due to
changes in resting
membrane potential, a cell becomes positively charged and this
creates a voltage change)
The action potential reaches the axon terminals which causes
the axon terminals to release a neurotransmitter called Ach
(acetylcholine)
Ach then binds to the receptors on a muscle cell and this
MYOSIN UNIT 3 EXAM HELP GUARANTEED SUCCESS NEW
UPDATE 2022
2022
3 types of muscles
- The main function of the muscular system is movement.
- There are three types of muscle tissue: skeletal, cardiac, and smooth.
Skeletal
Voluntary, striated, multiple nuclei, parallel
- Skeletal muscle is voluntary.
- These muscles are attached to bones and are responsible for their movement.
- Skeletal muscle consists of long fibers and is striated due to the repeating patterns of the
myofilaments (made of the protein actin and myosin) that make up the fibers.
Cardiac
Involuntary, striated, intercalated disc (made of
desmosomes and gap junctions) branched
- Cardiac muscle is found in the heart.
- Cardiac muscle is striated like skeletal muscle, but differs in that the plasma membrane of the
cardiac muscle causes the muscle to beat even when away from the heart.
- The action potentials of cardiac and skeletal muscles also differ.
Smooth
- Smooth muscle is involuntary.
MYOSIN UNIT 3 EXAM HELP GUARANTEED SUCCESS NEW
UPDATE 2022
,UNIT 3 EXAM HELP GUARANTEED SUCCESS NEW UPDATE
2022
- It is found in organs and enables functions such as digestion and respiration.
- Unlike skeletal and cardiac muscle, smooth muscle is not striated.
- Smooth muscle has less myosin and does not generate as much tension as skeletal
muscle.
Involuntary, NO STRIATIONS, spindle shaped, found in hollow organs
Muscle is electrically excitable
Action potentials (AP) will cause a release of a NT
(neurotransmitter), the NT will bind to receptors on
muscle cells causing them to be “turned on”
Sarcomeres:
Sarcomeres are composed of long, fibrous proteins as filaments that slide
past each other when a muscle contracts or relaxes. Two of the important
proteins are myosin, which forms the thick filament, and actin, which forms
the thin filament. Myosin has a long, fibrous tail and a globular head, which
binds to actin.
Arrangements or actin
and myosin Contractile
unit of muscle
H zone – contains
MYOSIN UNIT 3 EXAM HELP GUARANTEED SUCCESS NEW
UPDATE 2022
, UNIT 3 EXAM HELP GUARANTEED SUCCESS NEW UPDATE
2022
only myosin I band
– contains only
actin
A band – contains actin
and myosin M line
anchors myosin
Z-disc anchors thin filaments
When a muscle goes through contraction, the H zone and I
band become smaller/start disappearing
Muscle Contraction
Muscle contraction is the activation of tension-generating sites within muscle
fibers. In physiology, muscle contraction does not necessarily mean muscle
shortening because muscle tension can be produced without changes in
muscle length such as holding a heavy book or a dumbbell at the same
position.
An AP (action potential) is sent from the cell body of a neuron
after it depolarizes (remember that depolarization happens due to
changes in resting
membrane potential, a cell becomes positively charged and this
creates a voltage change)
The action potential reaches the axon terminals which causes
the axon terminals to release a neurotransmitter called Ach
(acetylcholine)
Ach then binds to the receptors on a muscle cell and this
MYOSIN UNIT 3 EXAM HELP GUARANTEED SUCCESS NEW
UPDATE 2022
