Muscles Flashcards
What are the connective tissue layers of a skeletal muscle?
- Epimysium - surrounds entire muscle
- Perimysium - surrounds fascicles
- Endomysium - surrounds individual cells
Band without myosin
L-band
Cytoplasm of a myocyte
Sarcoplasm
What is The Triad?
Where the T-Tubule meets with the Sarcoplasmic Reticulum on either side
Label the things
label the things
How are the various connective tissue layers of the muscle connected to each other?
Fibers from the endomysium and perimysium are woven into each other.
All three come together at the end of the muscle to form a tendon or aponeurosis
Perimysium
- Surrounds muscle fascicles
- Connective tissue with collagin and elastic fibers
- Contains nervs and blood vessels
What are thick filaments made of?
A bunch of myosin
Z-line
Where the actin molecules are bound together
Muscle contraction where length changes
Isotonic
acetylcholine
flat sheet of connective tissue that connect flat sheets of muscle (abdominal)
Which neurotransmitter is used in the neuromuscular junction?
Acetylcholine (ACh)
Parts of a muscle twitch (over time)
Which two proteins make up myofibrils?
- Actin
- Myosin
Lable the things!
Treppe
Muscle gets stimulated quickly enough that the peak of the contraction phase keeps getting higher, but the muscle is allowed to fully relax inbetween twitches.
What is the part of the sarcomere where the thin and thick filaments overlap?
Crossbridge
Fluid surrounding cells
Interstitial fluid
Molecule that can store energy for 15 seconds
Creatine phosphate (CP)
One muscle stimulation is called:
A twitch
What is the border between sarcomeres called?
Z-line
Line where actin filaments are attached
M-line
Steps in cellular respiration
Which part of the sarcoplasmic reticulum is in contact with the transverst tubules?
The Terminal Cisterna
Basic formula for cellular respiration
O2 + glucose → ATP + CO2 + H2O
How does calcium get from the sarcoplasmic reticulum to the myofibrils?
Voltage gated calcium channels
Endomysium
- Surrounds individual muscle cells (fibers)
- Contains satellite cells, capillaries, and nerves
- Areolar connective tissue
Stretchy molecule that binds the tips of the Myosin molecules to the Z line
Titin
Incomplete tetanus
Muscle stimulation comes quick enough that the relaxation period starts getting shorter.
How does calcium allow actin to pull the myosin along?
Calcium (Ca2+) binds to Troponin complex, pulling Tropomyosin out of the way of the Myosin binding sites on the Actin.
What are the steps of the “sliding fillament thingy” that use ATP?
Unactivated Myosin + ATP → activated Myosin
Activated Myosin + Actin → MOVEMENT
Post movemente Myosin + ATP → unactivated Myosin
M-Line
Where Myosin molecules are bound together
Label the things!
What are thin filaments made of?
Two strands of Actin, twisted with Tropomyosin, smattered with Troponin
Tetanus
Stimulation rate increases until the relaxion phase disapears
Basic unit of muscle contraction
Sarcomere
Actin and Myosin are:
Myofilaments
Connective tissue connecting muscle to muscle
Aponeurosis
Pump that maintains normal membrane potential
Na+/K+ ATPase
(maintains higher sodium outside and higher potassium inside)
bundle of muscle fibers controlled by the same nerve
motor unit
Epimysium
- Surrounds muscle organ
- Connected to deep fascia
- Dense irregular CT
Holds actin strands together
nebulin
Band with myosin
A-band
Cell membrane of a myocyte
Sarcolemma
Muscle contraction where length does not change
isometric
