Locomotion and Movement
Syllabus Unit: Human Physiology
Why it matters
Chapter overview
Movement in the human body ranges from amoeboid white blood cells to ciliary sweeping to the coordinated muscular contraction that moves the skeleton. NEET tests the classification of movement types, the sliding filament mechanism of skeletal muscle contraction, the skeleton's bones and joints, and the disorders that impair muscles, bones or joints.
Biology Syllabus Human Physiology 20%–22% weightage
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Movement Types
1AmoeboidPseudopodia (leucocytes)
2CiliaryBeating cilia (trachea)
3Skeletal MuscleVoluntary, striated
4Smooth/Cardiac MuscleInvoluntary
1Types of Movement & Muscles
The body shows three distinct kinds of movement — amoeboid, ciliary and muscular — and three distinct muscle tissue types power the latter.
Learning Objectives
- Distinguish amoeboid, ciliary and muscular movement with one example each.
- Classify muscle tissue into skeletal, smooth and cardiac types.
- State whether each muscle type is voluntary/involuntary and striated/unstriated.
- Give one location example for each of the three muscle types.
Key Terms
Amoeboid MovementMovement via pseudopodia formed by cytoplasmic streaming, seen in macrophages and leucocytes.
Ciliary MovementCoordinated beating of cilia that moves substances over a stationary cell surface, e.g. in the trachea and fallopian tubes.
Skeletal MuscleStriated, voluntary muscle attached to bones via tendons, responsible for body movement.
Cardiac MuscleStriated but involuntary muscle found only in the heart; branched fibres joined by intercalated discs allow synchronised contraction.
Movement in the human body is not a single mechanism — three fundamentally different types occur, and only one of them (muscular) is what most people mean by 'movement'.
Three types of movement
- Amoeboid movement — pseudopodia formed by cytoplasmic streaming; seen in macrophages and leucocytes migrating through tissue.
- Ciliary movement — coordinated, rhythmic beating of cilia moves material across a stationary cell surface; seen in the trachea (moving mucus/dust) and fallopian tubes (moving the ovum).
- Muscular movement — contraction of specialised muscle tissue; the primary mechanism for locomotion and organ movement.
Three types of muscle
- Skeletal muscle — striated, voluntary, attached to bones via tendons; long, cylindrical, multinucleate fibres; e.g. biceps.
- Smooth (visceral) muscle — non-striated, involuntary, spindle-shaped uninucleate fibres; found in walls of the gut, blood vessels, bladder, and other internal organs.
- Cardiac muscle — striated but involuntary; branched fibres with a single nucleus each, connected end-to-end by intercalated discs that allow the whole heart to contract as a synchronised unit; found only in the heart.
Common MistakeCardiac muscle is the frequent NEET trap: it is striated (like skeletal) but involuntary (like smooth) — it does not fit neatly into either 'striated = voluntary' or 'unstriated = involuntary' assumption.