The difference between a skeletal muscle and a cardiac muscle are:
| Skeletal Muscle | Cardiac Muscle |
| Skeletal muscles are attached to the bones and skins |
The heart is the only organ with cardiac muscles. |
| They are voluntary muscles as their activities are under the voluntary control of the nervous system. |
They are involuntary muscles as their activities are not directly controlled by the nervous system. They are controlled by the central nervous system, endocrine system and different chemicals. |
| The cells of the skeletal muscles are straight, cylindrical, non-branched and multinucleated. |
The cells of the cardiac muscles are cylindrical, branched and uni-nucleated. |
| They do not have intercalated discs. | Intercalated discs connect the cells and aid in the coordination or synchronization of the heartbeat. |
| They have a high energy requirement. | They have an intermediate energy requirement. |
| They contract rapidly and are fatigued easily in a short period of time. | They contract rapidly but do not fatigue easily. |
| They help in movement and locomotion. | They help in the contraction and relaxation of the heart. |
Fill in the blank spaces:
(a) All mammals (except a few) have __________ cervical vertebra.
(b) The number of phalanges in each limb of human is __________
(c) Thin filament of myofibril contains 2 ‘F’ actins and two other proteins namely____ and _____.
(d) In a muscle fibre \( (Ca^{2+} )\) is stored in __________
(e) __________ and __________ pairs of ribs are called floating ribs.
(f) The human cranium is made of __________ bones
Name the type of joint between the following:-
(a) atlas/axis
(b) carpal/metacarpal of thumb
(c) Between phalanges
(d) femur/acetabulum
(e) Between cranial bones
(f) Between pubic bones in the pelvic girdle
What are the different types of movements exhibited by the cells of the human body?
Match Column I with Column II:
| Column I | Column II |
| (a) Smooth Muscle | (i) Myoglobin |
| (b) Tropomyosin | (ii) Thin Filament |
| (c) Red muscle | (iii) Sutures |
| (d) Skull | (iv) Involuntary |
Write the difference between Pectoral and Pelvic girdle