Locomotion and Movement for NEET UG
Every movement you make, from blinking to running, comes from muscle fibres sliding filaments past each other. Learn how a muscle contracts, and how bones and joints let it move you.
BiologyClass 1173 MCQs2 lessons13 flashcards3 memory tricks
Practise Locomotion and Movement free
What you'll learn
- Muscle contraction: the sliding filament theory
Describe the sarcomere and explain how muscles contract. - Skeleton, joints and disorders
Recall the main bones and types of joints, and common skeletal disorders.
Memory tricks
When muscle contracts, actin slides over myosin: the I band and H zone shorten, the A band (the length of myosin) doesn't change.
Pivot: atlas–axis. Hinge: knee, elbow. Ball and socket: shoulder, hip. Saddle: carpal–metacarpal joint of the thumb. Gliding: between carpals.
12 pairs: 7 true ribs attach directly to the sternum, 3 false ribs join through cartilage, and 2 floating ribs have no front attachment.
Try 3 NEET-style questions
Q1. The joints between the flat bones of the skull, which allow no movement, are
- fibrous joints
- cartilaginous joints
- ball and socket joints
- hinge joints
Show answer
Answer: (1) fibrous joints
Flat skull bones are fused end-to-end by dense fibrous connective tissue (sutures), forming fibrous joints that do not allow movement.
Q2. The total number of vertebrae in the adult human vertebral column is
- 33
- 24
- 30
- 26
Show answer
Answer: (4) 26
The adult column has 26 serially arranged vertebrae: 7 cervical, 12 thoracic, 5 lumbar, 1 sacral (fused) and 1 coccygeal (fused).
Q3. The 11th and 12th pairs of ribs are called floating ribs because they
- are not connected ventrally to the sternum
- are joined directly to the sternum
- join the sternum through the 7th rib cartilage
- are not connected to the vertebral column
Show answer
Answer: (1) are not connected ventrally to the sternum
The last two pairs of ribs are attached to the vertebral column but not ventrally to the sternum, so they are called floating ribs.
Practise all 73 questions Free · explanations for every option · see where you go wrong