Which one of the following are the correct pairing of a body part and the kind of muscle tissue that moves it?
Correct answer: C. Iris - Involuntary smooth muscle
- A. Biceps of the upper arm - Smooth muscle fibres
- B. Abdominal wall - Skeletal muscle
- C. Iris - Involuntary smooth muscle
- D. Heart wall - Involuntary unstriated muscle
Explanation
Smooth muscles are called involuntary muscles because the action of these muscles is controlled by the autonomic nervous system i.e. it is not under the control of the animal's will. The iris of the eyes consists of smooth involuntary muscles. The abdominal wall also has smooth muscles. The biceps of the upper arm are made of skeletal muscles while the heart wall consists of cardiac muscles which are striated.
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About Support and Movement
Support and movement covers the axial and appendicular skeleton, bone structure, joints and the arrangement of skeletal muscles. Muscle contraction is explained through actin, myosin, sliding filaments, calcium ions and ATP, while arthritis is distinguished as a disorder of joints rather than a normal part of movement.
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