In the model, a thick filament is 16 u long and each thin filament is 10 u long…
Contributed by StemPy LabTry it on paper first. A hint, the key idea and the worked solution are here when you need them.
In the model, a thick filament is u long and each thin filament is u long. A relaxed sarcomere is u long from Z line to Z line.
- How long is the A band?
- How long is the I band, counting both halves?
- How long is the H zone?
- How long is the overlap of one thin filament with the thick filaments?
Need a reminder? The key ideaShow
The sarcomere lies between two Z lines. The A band is as long as the thick filaments. The I band holds only thin filaments. The H zone is the part of the A band that the thin filaments do not reach. In the model, the thick filament is u and each thin filament is u.
The worked solution
Have you tried it?
Work it out on paper first. It is fine to get stuck or make a mistake: that is how we learn. When you are ready, go through the solution one step at a time, and check each step against your own.
Given. Thick filament: u. Thin filament: u. Sarcomere: u.
Plan. The A band is the thick filament. The rest of the sarcomere is the I band. The H zone is what the thin filaments do not cover.
Step 1. A band. u.
Step 2. I band. u, which is u on each side.
Step 3. H zone. u.
Step 4. Overlap. Each half of the I band is u, so a thin filament of u overlaps the thick filament over u.
Answer: u; u; u; u.
Check. The overlap on each side is u, and the H zone is u. u, the thick filament.
Watch out. The lengths in this lesson are those of a model in arbitrary units.
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