Questions: The term Blank 1 describes the stiffness of Blank 2 that occurs a few hours after death. The reason for the stiffness is because when a person dies; tissues begin to deteriorate and break down. In muscle cells, as the Blank 3 breaks down, they release calcium ions into the Blank 4. These ions diffuse to the sarcomere where they bind to Blank 5. This results in tropomyosin being moved to expose the myosin binding sites on the Blank 6 molecule. Myosin then binds to the actin, resulting in contraction. Blank 7 binding is required to release the myosin head from the actin, but since the person is dead, there is no more ATP produced, so the muscles remain Blank 8, resulting in rigor mortis. They remain contracted until enzymes from lysosomes destroy the actin and myosin myofilaments, allowing the limbs to relax once more in death.

To fill in the blanks in the provided text, we need to understand the process of rigor mortis and muscle contraction. Here's the analysis:

1. Blank 1: The term that describes the stiffness occurring after death is "Rigor mortis."

2. Blank 2: The stiffness occurs in "skeletal muscles."

3. Blank 3: As the "sarcoplasmic reticulum" breaks down, it releases calcium ions.

4. Blank 4: These calcium ions are released into the "sarcoplasm."

5. Blank 5: Calcium ions bind to "troponin."

6. Blank 6: This exposes the myosin binding sites on the "actin" molecule.

7. Blank 7: "ATP" binding is required to release the myosin head from the actin.

8. Blank 8: Since no more ATP is produced, the muscles remain "contracted."

Here's the completed text with the blanks filled in:

The term Rigor mortis describes the stiffness of skeletal muscles that occurs a few hours after death. The reason for the stiffness is because when a person dies; tissues begin to deteriorate and break down. In muscle cells, as the sarcoplasmic reticulum breaks down, they release calcium ions into the sarcoplasm. These ions diffuse to the sarcomere where they bind to troponin. This results in tropomyosin being moved to expose the myosin binding sites on the actin molecule. Myosin then binds to the actin, resulting in contraction.

ATP binding is required to release the myosin head from the actin, but since the person is dead, there is no more ATP produced, so the muscles remain contracted, resulting in rigor mortis. They remain contracted until enzymes from lysosomes destroy the actin and myosin myofilaments, allowing the limbs to relax once more in death.