Biology: Muscle Tissue Functions Essay examples

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Sliding Filament Theory and Muscle Tissues study guide
Front

Back

Binding of the myosin head sequentailly prevents "_____________" of the thin filament. This makes it seem that the myosin is "_______" the actin ______.

back-sliding

walking

forward

Calcium ions are moved back into the SR by the process known as ____________ which is facilitated by specialized _________________. This process requires___.

Active transport

Calcium Ion Pumps

ATP

During muscle contraction, the ________shortens but the __________remains the same.

Sarcomere

Myofilament

Flexing the myosin head provides what is known as the ________.

power stroke

Hydrolysis of ATP returns the myosin head to its ____________conformation.

high-energy

Name 3 roles of ATP in the contraction of muscle.

Energizes power stroke of myosin head

Disconnects myosin head from actin

Actively transports calcium ions back to the sarcoplasmic reticulum

The myosin head contains binding sites for what 2 molecules?

Actin

ATP

The thick filament is composed of what molecule?

Myosin

True or False.
When a muscle contracts, all crossbridges are synchronized to bind and disconnect at the same time.

False. Not all crossbridges will bind and disconnect at the same time, because is this were done, the thin filament would never be moved forward, contracting the sarcomere. The myosin heads bind at different times to prevent the thin filament backsliding so as to "walk" the filament continually forward.

Waht are the 3 molecules that make up the thin filament?

Actin

Tropomyosin

Troponin

What are the 6 steps of the cross bridge cycling?

Influx of calcium ions

Binding of myosin to actin

Power stroke, causing sliding of thin filaments

Binding of ATP to cross bridge

Hydrolysis of ATP

Transfer of calcium ions back to the SR

What is the name of the condition in which muscles become rigid after death?

Rigor Mortis

What molecule is connected to the z-line?

Actin

What molecule must bind to the myosin head in order for it to disconnect from the actin?

ATP

What triggers the condition of body rigidity posthumously?

No ATP synthesis=ATP depletion=No disconnect of myosn head from actin, keeping muscles in a temporary (several hours) contracted state.

What triggers the release of calcium ions?

Action potential is passed down the T-tubules to the…