Name the part of a skeletal muscle that fits each clue…
Contributed by StemPy LabTry it on paper first. A hint, the key idea and the worked solution are here when you need them.
Name the part of a skeletal muscle that fits each clue.
- The connective tissue that holds the bundles together.
- The membrane that lines a muscle fibre.
- The store of calcium ions in a fibre.
- The word for a cell that has many nuclei.
- A student says: "A muscle fibre and a myofibril are the same thing." Correct the mistake in one sentence.
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.
Step 1. (a) The fascia, a layer of collagenous connective tissue.
Step 2. (b) The sarcolemma, the plasma membrane of the fibre.
Step 3. (c) The sarcoplasmic reticulum, which is the endoplasmic reticulum of the fibre.
Step 4. (d) A syncytium. A skeletal muscle fibre is one.
Step 5. (e) A muscle fibre is a whole cell, and a myofibril is one of the many parallel threads inside that cell.
Answer: (a) fascia; (b) sarcolemma; (c) sarcoplasmic reticulum; (d) syncytium; (e) a fibre is a cell, and a myofibril is a thread inside it.
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