A single motor neuron together with all the muscle fibres it supplies is called
Correct answer: B. a motor unit
- A. a sarcomere
- B. a motor unit
- C. a reflex arc
- D. a myofibril
Explanation
All fibres of one motor unit contract together when the neuron fires, and fine muscles like those of the eye have tiny units for precise control. A sarcomere is a contractile segment inside a fibre, a different level of organisation.
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The human skeleton provides support, protects organs, enables movement with muscles and stores minerals while bone marrow produces blood cells. Questions cover the axial and appendicular skeleton, types of bones and joints, cartilage, ligaments and tendons, and the difference between fixed, slightly movable and freely movable joints.
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