NCERT Solutions for Class 11 Biology Chapter 20 Locomotion and Movement
Important Board Questions
Locomotion and Movement
NCERT Books for Session 2022-2023
CBSE Board and UP Board
Question : 8
How do you distinguish between a skeletal muscle and a cardiac muscle?
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(a) All mammals (except a few) have seven cervical vertebra.
(b) The number of phalanges in each limb of a human is 14.
(c) Thin filament of myofibril contains 2 âFâ actins and two other proteins, namely troponin and tropomyosin.
(d) In a muscle fibre, Ca++ is stored in the sarcoplasmic reticulum.
(e) 11th and 12th pairs of ribs are called floating ribs.
(f) The human cranium is made up of eight bones.
Skeletal muscle:-
1. The cells of skeletal muscles are unbranched.
2. Intercalated disks are absent.
3. Alternate light and dark bands are present.
4. They are voluntary muscles.
5. They contract rapidly and get fatigued in a short span of time.
6. They are present in body parts such as the legs, tongue, hands, etc.
Cardiac muscle:-
1. The cells of cardiac muscles are branched.
2. The cells are joined with one another by intercalated disks that help in coordination or synchronization of the heartbeat.
3. Faint bands are present.
4. They are involuntary muscles.
5. They contract rapidly but do not get fatigued easily.
6. These muscles are present in the heart and control the contraction and relaxation of the heart.
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