A model of a skeletal muscle has 15 bundles…
Contributed by StemPy LabTry it on paper first. A hint, the key idea and the worked solution are here when you need them.
A model of a skeletal muscle has bundles. Each bundle holds muscle fibres, and each fibre has nuclei.
- How many fibres does the muscle have?
- How many nuclei does the muscle have?
- After an injury, bundles are destroyed. How many fibres are left?
Need a reminder? The key ideaShow
Skeletal muscle is striated and voluntary, visceral muscle is smooth and involuntary, and cardiac muscle is striated and involuntary. A muscle is made of bundles (fascicles), a bundle of fibres, and a fibre of myofibrils. A fibre is lined by the sarcolemma, holds many nuclei in the sarcoplasm, and is a syncytium.
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. bundles, fibres in each, nuclei in each fibre.
Plan. Multiply the numbers of equal groups.
Step 1. Fibres. .
Step 2. Nuclei. .
Step 3. After the injury. bundles, and fibres.
Answer: fibres; nuclei; fibres.
Check. The injury removes fibres, and .
Watch out. These numbers are chosen for practice. A real muscle has far more fibres, and the number of nuclei in a fibre differs from fibre to fibre.
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