Question

2. When a muscle
it shortens and thickens.
3. When a muscle
it regains its original shape.
4. Joints in the bones of the skull are of
type. .
5. The bones at the elbow are joined by a
joint.​

Answer 1

Answer:

2. When a muscle cell is stimulated by a nerve impulse, these myofilaments slide past each other until they completely overlap. This makes the muscle cell shorter and fatter. The more shortened muscle cells there are in a muscle, the greater the contraction of the muscle as a whole.

3.

Explanation:

Elasticity. The ability of a muscle to return to its original shape after contraction or extension.