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Lecture 17
Physio Exam 2
29
Physiology
Undergraduate 2
06/06/2010

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Term
How many skeletal tendons connect at the bone
Definition
2
Term
What kind of striated muscle that is smaller cells, and attaches from end to end
Definition
cardiac
Term
What runs the length of muscle in skeletal muscle?
Definition
Muscle fibers
Term
Muscle fibers change size in ________ but no mitosis
Definition
thickeness
Term
What are the lines in skeletal and cardiac muscle?
Definition
Striations
Term
what happens when the muscle contracts during filament overlap.
Definition
The overlaps increase.
Term
Which bands contain thick filaments?
Definition
Dark
Term
Which band contain thin filaments?
Definition
light
Term
What is the unit of contraction that stretch from z line to z line?
Definition
Sarcomere
Term
What filaments are anchored to z lines?
Definition
Think filaments
Term
What connects to thin filaments during contraction?
Definition
thick
Term
Which polymer backbone-double stranded helix
Definition
Actin
Term
Which thin filaments are long, thin, protein polymer runs along actin?
Definition
tropomyosin
Term
What binds to tropomyosin?
Definition
troponin
Term
What is electrical events leading to muscle contraction?
Definition
Excitation contraction coupling
Term
What starts at NMJ synapse?
Definition
Skeletal Action Potential
Term
_______ binds to receptor opens Na+ channels and starts AP spread in both direction
Definition
NT (Ach)
Term
_______ AP travels inward- alter protein in ______ leading to openin Ca++ channels in SR near _________ Ca++ causes relaxation
Definition
T-tuble
Term
What binds with troponin on thin filaments?
Definition
Calcium
Term
Calcium binds to troponin and causes what?

When that happens what is being exposed at the binding site?
Definition
tropomysoin

Actin myosin
Term
What is converted and bound into ADP. PI when myosin is there?
Definition
ATP
Term
When ADP PI. is released what happens to the myosin and it's head?
Definition
the myosin changes shape and the head twist
Term
What happens when PI is released?
Definition
when it's released force develops
Term
when filaments slide does it increase or decrease force on the cross bridge head?
Definition
decrease
Term
filament sliding where does the energy state goes to?
Definition
the lowest energy state.
Term
when new ATP binds to myosin, what is released?

If this process is repeated what is elevated?
Definition
Actin, calcium
Term
what stops calcium release from Sarcoplasmic reticulum?
Definition
Cessation of action potentials
Term
What is returned to the sarcoplasmic reticulum from the Ca++ pumps?
Definition
calcium
Term
when the tropomyosin net blocks actin myosin binding site what happened?
Definition
Muscle relaxes
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