EasyBiologyHigh School (11–12)Tissues and Organs › Structural Organisation in AnimalsConceptualA-LevelIB
Name the kind of muscle in each clue. Long cylindrical fibres with stripes and many nuclei…
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 kind of muscle in each clue.
- Long cylindrical fibres with stripes and many nuclei, attached to a bone.
- Spindle shaped cells with no stripes, in the wall of the intestine.
- Branched striped cells in the wall of the heart.
- The muscle that you can contract whenever you choose.
- The one muscle that is striped and works without your will.
Need a reminder? The key ideaShow
Muscular tissue is made of long cells called fibres that contract and shorten. Skeletal muscle is attached to bones, and its fibres are striated, long, cylindrical, unbranched and multinucleate. It is voluntary. Smooth muscle lies in the walls of internal organs such as blood vessels, the stomach and the intestine. Its cells are spindle shaped with one nucleus and no stripes. It is involuntary. Cardiac muscle forms the wall of the heart. Its cells are striated and branched, and they are joined end to end by intercalated discs with gap junctions, so that they contract as a unit. It is involuntary. The output of the heart is the rate times the stroke volume.
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) Skeletal muscle. It is striped, multinucleate and attached to bones.
Step 2. (b) Smooth muscle. It has no stripes and its cells are spindle shaped.
Step 3. (c) Cardiac muscle. The cells are striped and branched.
Step 4. (d) Skeletal muscle. It is voluntary.
Step 5. (e) Cardiac muscle. It is striped and involuntary.
Answer: (a) skeletal; (b) smooth; (c) cardiac; (d) skeletal; (e) cardiac.
Discussion (0)
Log in to join the discussion.
Loading…