The given figures represent three types of muscle fibers, each with distinct features:
1. Figure (a)- Skeletal Muscle Fibres: These are striated muscles closely at tached to skeletal bones, such as the triceps and biceps. They are bundled together in parallel fashion to allow efficient force generation for voluntary movements.
2. Figure (b)- Smooth Muscle Fibres: Smooth muscle fibers are non-striated and are found in the walls of internal organs like blood vessels, stomach, and intestines. These muscles function involuntarily and are responsible for actions like peristalsis and regulating blood flow.
3. Figure (c)- Cardiac Muscle Fibres: Cardiac muscle fibers are striated like skeletal muscles but are found exclusively in the heart. They have unique intercalated discs that allow rhythmic and coordinated contractions for pumping blood.
Correct Answer: Option (1): Figure (a) represents skeletal muscle fibers, which are closely attached to skeletal bones and help in voluntary movement.
List I | List II | ||
---|---|---|---|
A | Mesozoic Era | I | Lower invertebrates |
B | Proterozoic Era | II | Fish & Amphibia |
C | Cenozoic Era | III | Birds & Reptiles |
D | Paleozoic Era | IV | Mammals |