In the diagram of skeletal muscle below what does #1 represent?

In the diagram of skeletal muscle below what does #2 represent?

In the diagram of skeletal muscle below what does #5 represent?

In the diagram of skeletal muscle below what does #6 represent?

In the diagram of skeletal muscle below what does #7 represent?

In the diagram of skeletal muscle below what does #8 represent?

In the diagram of skeletal muscle below what proteins would be found at the structure labeled #3?

In the diagram of skeletal muscle below what protein would be found at the structure labeled #4?

What proteins make up structure #1?

What proteins make up structure #2?

In the diagram below what does #1 represent?

In the diagram below what does #2 represent?

_________________ are made of the protein actin and the accessory proteins troponin and tropomyosin.

_________________ are made of the protein myosin

What are the lengthwise subdivisions within muscle fibers that are made up of bundles of myofilaments that are responsible for muscle contraction?

These structures transmit the action potential (nerve impulse) through the muscle cell and allow entire muscle fiber to contract simultaneously.

What is the cell membrane of a muscle fiber?

This is like the cytoplasm of a muscle fiber (cell)

Identify the structure labeled #1 in the diagram of muscle tissue.

Identify the structure labeled #2 in the diagram of muscle tissue.

Identify the structure labeled #3 in the diagram of muscle tissue.

Identify the structure labeled #4 in the diagram of muscle tissue.

Identify the structure labeled #5 in the diagram of muscle tissue.

Identify the structure labeled #6 in the diagram of muscle tissue.

Identify the structure labeled #7 in the diagram of muscle tissue.

What does the structure labeled #7 store that will help in muscle contraction?

Identify the structure labeled #8 in the diagram of muscle tissue.

Identify the structure labeled #9 in the diagram of muscle tissue.

Identify the structure labeled #10 in the diagram of muscle tissue.

Identify the structure labeled #11 in the diagram of muscle tissue.

Interactions between actin and myosin filaments of the sarcomere are responsible for ______________.

In response to action potentials arriving from the transverse tubules, the sarcoplasmic reticulum releases ____________.

Active sites on the actin become available for binding when calcium binds to _________.

The functional unit of a skeletal muscle fiber is the ___________.

After death, muscle fibers run out of ATP and calcium begins to leak from the sarcoplasmic reticulum into the sarcoplasm. This results in a condition known as __________________.

The area of the sarcomere containing the thick filaments and that stay the same length during muscle contraction are the _____ ________.

What is the midpoint or midline of a sarcomere?

What is the ends of a sarcomere and also the midpoint of the I band?

What is the area around the M line that has thick filaments but no thin filaments?

What part of the sarcomere is described below?

The area of the sarcomere that contain thin filaments and no thick filaments. This part of the sarcomere also shrinks or gets smaller during muscle contraction.

During step 1 of muscle contraction An action potential (nerve impulse) arrives at the Neuromuscular junction (synapse). ________________ are released and bind to sarcolemma.

During step 2 of muscle contraction An action potential (nerve impulse) is generated and travels down the _______________.

During step 3 of muscle contraction when the action potential reaches the sarcoplasmic reticulum __________ are released from the SR.

During step 4 of muscle contraction the calcium ions bind to the ________, troponin changes shape (removing the shield of tropomyosin), and the actin active sites are exposed.

During step 5 of muscle contraction contraction occurs. Myosin cross bridges (myosin heads) attach and detach from actin pulling the actin filaments toward the center of the sarcomere. The release of energy from __________ powers this contraction process.

During step 6 of muscle contraction The muscle is contracted and shortens. The sarcomeres within the muscle cell have all contracted with the __________ disappearing and the I bands getting smaller

During step 7 of muscle contraction once the action potential ends calcium ions are transported back into the _________________.

During step 8 of muscle contraction the removal of calcium ions causes ________________ to re-shield the binding sites on the actin strands, which blocks the active sites on actin

During step 9 of muscle contraction muscle contraction ends. The muscle lengthens and relaxes. The sarcomeres within the sarcomere are back to normal and the H zone reappears and I bands have gotten _________.