Question

1. what are muscle fibers?
2. how are smooth muscles different from skeletal muscles?
3. draw straight lines to match each fact on the left with the correct num

number of muscles it takes to frown

Explanation:

Question 2: What are muscle fibers?

Muscle fibers are long, cylindrical cells that make up muscles. They are specialized for contraction, enabling movement. Skeletal muscle fibers are multinucleated, striated, and under voluntary control. Smooth muscle fibers are uninucleated, non - striated, and involuntary, while cardiac muscle fibers (a type too) are striated, have intercalated discs, and are involuntary.

1. Structure: Smooth muscle fibers are spindle - shaped, uninucleated, and non - striated. Skeletal muscle fibers are long, cylindrical, multinucleated, and striated.
2. Control: Smooth muscles are involuntary (not under conscious control), while skeletal muscles are voluntary (controlled consciously).
3. Location: Smooth muscles are found in the walls of internal organs (like the stomach, blood vessels, intestines). Skeletal muscles are attached to bones, enabling body movement.
4. Function - related differences: Smooth muscles help in functions like peristalsis (in the digestive tract) and regulating blood vessel diameter. Skeletal muscles are responsible for body movement, posture, and generating heat.

First, recall common muscle - related numbers: For example, it takes 17 muscles to smile and 43 to frown (this is a common fact). So if "Number of muscles it takes to frown" is on the left, you would match it to 43 (if that's one of the options on the right). You need to identify each fact (e.g., number of muscles in the eye, number of skeletal muscles in the body etc.) and their corresponding correct numerical values.

Answer:

Muscle fibers are long, specialized cells (cylindrical in skeletal muscle) that compose muscles, adapted for contraction to enable movement. Skeletal muscle fibers are multinucleated, striated, voluntary; smooth are uninucleated, non - striated, involuntary; cardiac are striated, have intercalated discs, involuntary.

Question 3: How are smooth muscles different from skeletal muscles?