Ch 17Locomotion and Movement — Class 11 Biology, concept-first.

Movement is one of the defining features of living things, and it shows up in strikingly different forms across the living world.

The cells of the human body show three main kinds of movement: amoeboid, ciliary and muscular movement.

Muscle is the tissue that gives the body most of its power to move. Before turning to muscle proper, it is worth recalling from the chapter on the cell that cilia and flagella are outgrowths of the ce…

The banding pattern of muscle makes sense once the two contractile proteins — actin and myosin — are examined in detail.

How a muscle actually shortens is explained by the sliding filament theory. Its central idea is simple: a muscle fibre contracts when the thin filaments slide over the thick filaments.

Working alongside the muscles is the skeletal system -- the body's supporting scaffold, built chiefly of bones with a handful of cartilages filling in at the flexible points.

Joints are essential for every kind of movement that involves the bony parts of the body, and locomotion is no exception.

The muscles and the skeleton keep us upright and let us move, but both systems can be affected by a range of disorders.

Movement is one of the defining features of every living thing, and animals in particular show it in many forms.

Higher-order thinking problems from the NCERT Exemplar.